diff --git a/creusot-deps.opam b/creusot-deps.opam
index 903d1ddb7..896c89438 100644
--- a/creusot-deps.opam
+++ b/creusot-deps.opam
@@ -4,8 +4,8 @@ opam-version: "2.0"
 maintainer: "Armaël Guéneau <armael.gueneau@inria.fr>"
 authors: "the creusot authors"
 depends: [
-  "why3" {= "git-5d13"}
-  "why3-ide" {= "git-5d13" & !?in-creusot-ci}
+  "why3" {= "git-91b3"}
+  "why3-ide" {= "git-91b3" & !?in-creusot-ci}
 # optional dependencies of why3
   "ocamlgraph"
   "camlzip"
@@ -16,6 +16,6 @@ depends: [
 # When updating the hash and git-XXX below, don't forget to update them in the
 # depends: field above!
 pin-depends: [
-  [ "why3.git-5d13" "git+https://gitlab.inria.fr/why3/why3.git#5d13eab26ed" ]
-  [ "why3-ide.git-5d13" "git+https://gitlab.inria.fr/why3/why3.git#5d13eab26ed" ]
+  [ "why3.git-91b3" "git+https://gitlab.inria.fr/why3/why3.git#91b314fb2" ]
+  [ "why3-ide.git-91b3" "git+https://gitlab.inria.fr/why3/why3.git#91b314fb2" ]
 ]
diff --git a/creusot-setup/src/tools_versions_urls.rs b/creusot-setup/src/tools_versions_urls.rs
index c1621b46c..f4ace251d 100644
--- a/creusot-setup/src/tools_versions_urls.rs
+++ b/creusot-setup/src/tools_versions_urls.rs
@@ -6,7 +6,7 @@
 // - update the SHA256 hash for each binary accordingly (use e.g. sha256sum to compute it)
 
 // tools without binary releases
-pub const WHY3_VERSION: &'static str = "1.7.1";
+pub const WHY3_VERSION: &'static str = "1.7.2";
 pub const ALTERGO_VERSION: &'static str = "2.5.3";
 // tools with binary releases
 pub const Z3_VERSION: &'static str = "4.12.4";
diff --git a/creusot/tests/should_succeed/red_black_tree/why3session.xml b/creusot/tests/should_succeed/red_black_tree/why3session.xml
index a783d468d..8f60d1eee 100644
--- a/creusot/tests/should_succeed/red_black_tree/why3session.xml
+++ b/creusot/tests/should_succeed/red_black_tree/why3session.xml
@@ -10,367 +10,164 @@
 <path name=".."/><path name="red_black_tree.mlcfg"/>
 <theory name="RedBlackTree_Impl16_Clone" proved="true">
  <goal name="clone&#39;&#39;vc" expl="VC for clone&#39;" proved="true">
- <proof prover="1"><result status="valid" time="0.009386" steps="8"/></proof>
+ <proof prover="2"><result status="valid" time="0.023752" steps="270"/></proof>
  </goal>
 </theory>
 <theory name="RedBlackTree_Impl0_ModelAccHasMapping_Impl" proved="true">
  <goal name="vc_model_acc_has_mapping" proved="true">
- <proof prover="6"><result status="valid" time="0.010000" steps="25123"/></proof>
+ <proof prover="2"><result status="valid" time="0.029434" steps="9545"/></proof>
  </goal>
 </theory>
 <theory name="RedBlackTree_Impl0_HasMappingModelAcc_Impl" proved="true">
  <goal name="vc_has_mapping_model_acc" proved="true">
- <proof prover="1"><result status="valid" time="0.055452" steps="722"/></proof>
+ <proof prover="2"><result status="valid" time="0.053117" steps="15473"/></proof>
  </goal>
 </theory>
 <theory name="RedBlackTree_Impl0_HasMappingModel_Impl" proved="true">
  <goal name="vc_has_mapping_model" proved="true">
- <proof prover="1"><result status="valid" time="0.013659" steps="88"/></proof>
+ <proof prover="2"><result status="valid" time="0.009282" steps="5983"/></proof>
  </goal>
 </theory>
 <theory name="RedBlackTree_Impl0_HasMappingInj_Impl" proved="true">
  <goal name="vc_has_mapping_inj" proved="true">
- <proof prover="1"><result status="valid" time="0.016619" steps="54"/></proof>
+ <proof prover="2"><result status="valid" time="0.021070" steps="6621"/></proof>
  </goal>
 </theory>
 <theory name="RedBlackTree_Impl1_HasMapping_Impl" proved="true">
  <goal name="vc_has_mapping" proved="true">
- <proof prover="1"><result status="valid" time="0.020995" steps="154"/></proof>
+ <proof prover="1"><result status="valid" time="0.013200" steps="150"/></proof>
  </goal>
 </theory>
 <theory name="RedBlackTree_Impl9_Height_Impl" proved="true">
  <goal name="vc_height" proved="true">
- <proof prover="2"><result status="valid" time="0.010000" steps="1931"/></proof>
+ <proof prover="2"><result status="valid" time="0.008259" steps="1931"/></proof>
  </goal>
 </theory>
 <theory name="RedBlackTree_Impl10_Height_Impl" proved="true">
  <goal name="vc_height" proved="true">
- <transf name="split_vc" proved="true" >
-  <goal name="vc_height.0" proved="true">
-  <transf name="split_vc" proved="true" >
-   <goal name="vc_height.0.0" proved="true">
-   <proof prover="1"><result status="valid" time="0.007091" steps="13"/></proof>
-   </goal>
-  </transf>
-  </goal>
-  <goal name="vc_height.1" proved="true">
-  <proof prover="1"><result status="valid" time="0.019465" steps="189"/></proof>
-  </goal>
-  <goal name="vc_height.2" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.005987" steps="13"/></proof>
-  </goal>
-  <goal name="vc_height.3" proved="true">
-  <proof prover="1"><result status="valid" time="0.021498" steps="197"/></proof>
-  </goal>
- </transf>
+ <proof prover="1"><result status="valid" time="0.021146" steps="273"/></proof>
  </goal>
 </theory>
 <theory name="RedBlackTree_Impl13_IsRed" proved="true">
  <goal name="is_red&#39;vc" expl="VC for is_red" proved="true">
- <proof prover="1"><result status="valid" time="0.010685" steps="76"/></proof>
+ <proof prover="1"><result status="valid" time="0.013137" steps="72"/></proof>
  </goal>
 </theory>
 <theory name="RedBlackTree_Impl14_RotateRight" proved="true">
  <goal name="rotate_right&#39;vc" expl="VC for rotate_right" proved="true">
- <transf name="split_vc" proved="true" >
-  <goal name="rotate_right&#39;vc.0" expl="type invariant" proved="true">
-  <proof prover="1"><result status="valid" time="0.013125" steps="26"/></proof>
-  </goal>
-  <goal name="rotate_right&#39;vc.1" expl="precondition" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.017326" steps="48"/></proof>
-  </goal>
-  <goal name="rotate_right&#39;vc.2" expl="type invariant" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.017530" steps="54"/></proof>
-  </goal>
-  <goal name="rotate_right&#39;vc.3" expl="precondition" proved="true">
-  <proof prover="6"><result status="valid" time="0.020000" steps="124439"/></proof>
-  </goal>
-  <goal name="rotate_right&#39;vc.4" expl="precondition" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.012969" steps="58"/></proof>
-  </goal>
-  <goal name="rotate_right&#39;vc.5" expl="precondition" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.020020" steps="94"/></proof>
-  </goal>
-  <goal name="rotate_right&#39;vc.6" expl="precondition" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.017736" steps="96"/></proof>
-  </goal>
-  <goal name="rotate_right&#39;vc.7" expl="type invariant" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.017338" steps="98"/></proof>
-  </goal>
-  <goal name="rotate_right&#39;vc.8" expl="type invariant" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.013940" steps="102"/></proof>
-  </goal>
-  <goal name="rotate_right&#39;vc.9" expl="precondition" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.018753" steps="124"/></proof>
-  </goal>
-  <goal name="rotate_right&#39;vc.10" expl="precondition" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.019866" steps="126"/></proof>
-  </goal>
-  <goal name="rotate_right&#39;vc.11" expl="type invariant" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.025188" steps="128"/></proof>
-  </goal>
-  <goal name="rotate_right&#39;vc.12" expl="precondition" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.025089" steps="158"/></proof>
-  </goal>
-  <goal name="rotate_right&#39;vc.13" expl="precondition" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.025942" steps="160"/></proof>
-  </goal>
-  <goal name="rotate_right&#39;vc.14" expl="assertion" proved="true">
-  <proof prover="1"><result status="valid" time="0.074109" steps="977"/></proof>
-  </goal>
-  <goal name="rotate_right&#39;vc.15" expl="type invariant" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.030837" steps="176"/></proof>
-  </goal>
-  <goal name="rotate_right&#39;vc.16" expl="type invariant" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.026536" steps="180"/></proof>
-  </goal>
-  <goal name="rotate_right&#39;vc.17" expl="postcondition" proved="true">
-  <proof prover="6"><result status="valid" time="0.020000" steps="162882"/></proof>
-  </goal>
-  <goal name="rotate_right&#39;vc.18" expl="postcondition" proved="true">
-  <proof prover="2" timelimit="5" memlimit="2000"><result status="valid" time="2.222259" steps="212871"/></proof>
-  </goal>
-  <goal name="rotate_right&#39;vc.19" expl="postcondition" proved="true">
-  <proof prover="6"><result status="valid" time="0.094220" steps="193257"/></proof>
-  </goal>
-  <goal name="rotate_right&#39;vc.20" expl="postcondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.164249" steps="2204"/></proof>
-  </goal>
-  <goal name="rotate_right&#39;vc.21" expl="postcondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.121344" steps="1744"/></proof>
-  </goal>
-  <goal name="rotate_right&#39;vc.22" expl="postcondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.030770" steps="197"/></proof>
-  </goal>
-  <goal name="rotate_right&#39;vc.23" expl="postcondition" proved="true">
-  <proof prover="6"><result status="valid" time="0.077800" steps="310120"/></proof>
-  </goal>
- </transf>
+ <proof prover="6"><result status="valid" time="0.226417" steps="756647"/></proof>
  </goal>
 </theory>
 <theory name="RedBlackTree_Impl14_RotateLeft" proved="true">
  <goal name="rotate_left&#39;vc" expl="VC for rotate_left" proved="true">
- <transf name="split_vc" proved="true" >
-  <goal name="rotate_left&#39;vc.0" expl="type invariant" proved="true">
-  <proof prover="1"><result status="valid" time="0.012972" steps="26"/></proof>
-  </goal>
-  <goal name="rotate_left&#39;vc.1" expl="precondition" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.020214" steps="48"/></proof>
-  </goal>
-  <goal name="rotate_left&#39;vc.2" expl="type invariant" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.017570" steps="54"/></proof>
-  </goal>
-  <goal name="rotate_left&#39;vc.3" expl="precondition" proved="true">
-  <proof prover="2"><result status="valid" time="0.040000" steps="10604"/></proof>
-  </goal>
-  <goal name="rotate_left&#39;vc.4" expl="precondition" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.016139" steps="58"/></proof>
-  </goal>
-  <goal name="rotate_left&#39;vc.5" expl="precondition" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.021662" steps="94"/></proof>
-  </goal>
-  <goal name="rotate_left&#39;vc.6" expl="precondition" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.017040" steps="96"/></proof>
-  </goal>
-  <goal name="rotate_left&#39;vc.7" expl="type invariant" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.024048" steps="98"/></proof>
-  </goal>
-  <goal name="rotate_left&#39;vc.8" expl="type invariant" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.022822" steps="102"/></proof>
-  </goal>
-  <goal name="rotate_left&#39;vc.9" expl="precondition" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.019097" steps="124"/></proof>
-  </goal>
-  <goal name="rotate_left&#39;vc.10" expl="precondition" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.023226" steps="126"/></proof>
-  </goal>
-  <goal name="rotate_left&#39;vc.11" expl="type invariant" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.025554" steps="128"/></proof>
-  </goal>
-  <goal name="rotate_left&#39;vc.12" expl="precondition" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.022633" steps="158"/></proof>
-  </goal>
-  <goal name="rotate_left&#39;vc.13" expl="precondition" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.025905" steps="160"/></proof>
-  </goal>
-  <goal name="rotate_left&#39;vc.14" expl="assertion" proved="true">
-  <proof prover="6"><result status="valid" time="0.020000" steps="63723"/></proof>
-  </goal>
-  <goal name="rotate_left&#39;vc.15" expl="type invariant" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.027892" steps="176"/></proof>
-  </goal>
-  <goal name="rotate_left&#39;vc.16" expl="type invariant" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.022966" steps="180"/></proof>
-  </goal>
-  <goal name="rotate_left&#39;vc.17" expl="postcondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.265379" steps="2976"/></proof>
-  </goal>
-  <goal name="rotate_left&#39;vc.18" expl="postcondition" proved="true">
-  <proof prover="0" timelimit="5" memlimit="2000"><result status="valid" time="1.963037" steps="491330"/></proof>
-  </goal>
-  <goal name="rotate_left&#39;vc.19" expl="postcondition" proved="true">
-  <proof prover="2"><result status="valid" time="0.057817" steps="18536"/></proof>
-  </goal>
-  <goal name="rotate_left&#39;vc.20" expl="postcondition" proved="true">
-  <proof prover="2"><result status="valid" time="0.130726" steps="19254"/></proof>
-  </goal>
-  <goal name="rotate_left&#39;vc.21" expl="postcondition" proved="true">
-  <proof prover="6"><result status="valid" time="0.020000" steps="134815"/></proof>
-  </goal>
-  <goal name="rotate_left&#39;vc.22" expl="postcondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.027117" steps="197"/></proof>
-  </goal>
-  <goal name="rotate_left&#39;vc.23" expl="postcondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.083407" steps="1406"/></proof>
-  </goal>
- </transf>
+ <proof prover="6"><result status="valid" time="0.248162" steps="829754"/></proof>
  </goal>
 </theory>
 <theory name="RedBlackTree_Impl14_FlipColors" proved="true">
  <goal name="flip_colors&#39;vc" expl="VC for flip_colors" proved="true">
- <transf name="split_vc" proved="true" >
-  <goal name="flip_colors&#39;vc.0" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.012886" steps="40"/></proof>
-  </goal>
-  <goal name="flip_colors&#39;vc.1" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.016851" steps="55"/></proof>
-  </goal>
-  <goal name="flip_colors&#39;vc.2" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.018582" steps="53"/></proof>
-  </goal>
-  <goal name="flip_colors&#39;vc.3" expl="type invariant" proved="true">
-  <proof prover="1"><result status="valid" time="0.019231" steps="61"/></proof>
-  </goal>
-  <goal name="flip_colors&#39;vc.4" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.020402" steps="91"/></proof>
-  </goal>
-  <goal name="flip_colors&#39;vc.5" expl="precondition" proved="true">
-  <proof prover="2"><result status="valid" time="0.042075" steps="9185"/></proof>
-  </goal>
-  <goal name="flip_colors&#39;vc.6" expl="precondition" proved="true">
-  <proof prover="6"><result status="valid" time="0.011988" steps="4402"/></proof>
-  </goal>
-  <goal name="flip_colors&#39;vc.7" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.023407" steps="111"/></proof>
-  </goal>
-  <goal name="flip_colors&#39;vc.8" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.023912" steps="113"/></proof>
-  </goal>
-  <goal name="flip_colors&#39;vc.9" expl="type invariant" proved="true">
-  <proof prover="1"><result status="valid" time="0.023346" steps="115"/></proof>
-  </goal>
-  <goal name="flip_colors&#39;vc.10" expl="type invariant" proved="true">
-  <proof prover="1"><result status="valid" time="0.020317" steps="123"/></proof>
-  </goal>
-  <goal name="flip_colors&#39;vc.11" expl="postcondition" proved="true">
-  <proof prover="6"><result status="valid" time="0.096582" steps="395799"/></proof>
-  </goal>
-  <goal name="flip_colors&#39;vc.12" expl="postcondition" proved="true">
-  <proof prover="6"><result status="valid" time="0.053033" steps="198875"/></proof>
-  </goal>
-  <goal name="flip_colors&#39;vc.13" expl="postcondition" proved="true">
-  <proof prover="6"><result status="valid" time="0.043914" steps="127439"/></proof>
-  </goal>
-  <goal name="flip_colors&#39;vc.14" expl="postcondition" proved="true">
-  <proof prover="2"><result status="valid" time="0.054301" steps="10080"/></proof>
-  </goal>
-  <goal name="flip_colors&#39;vc.15" expl="postcondition" proved="true">
-  <proof prover="2"><result status="valid" time="0.223335" steps="27849"/></proof>
-  </goal>
-  <goal name="flip_colors&#39;vc.16" expl="postcondition" proved="true">
-  <proof prover="2"><result status="valid" time="0.221947" steps="27928"/></proof>
-  </goal>
- </transf>
+ <proof prover="6"><result status="valid" time="0.169346" steps="592569"/></proof>
  </goal>
 </theory>
 <theory name="RedBlackTree_Impl14_Balance" proved="true">
  <goal name="balance&#39;vc" expl="VC for balance" proved="true">
  <transf name="split_vc" proved="true" >
   <goal name="balance&#39;vc.0" expl="precondition" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.016846" steps="26"/></proof>
+  <proof prover="2"><result status="valid" time="0.026818" steps="7128"/></proof>
   </goal>
   <goal name="balance&#39;vc.1" expl="precondition" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.016187" steps="29"/></proof>
+  <proof prover="2"><result status="valid" time="0.020681" steps="7179"/></proof>
   </goal>
   <goal name="balance&#39;vc.2" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.019013" steps="36"/></proof>
-  <proof prover="2"><result status="valid" time="0.030000" steps="7154"/></proof>
+  <proof prover="2"><result status="valid" time="0.021262" steps="7154"/></proof>
   </goal>
   <goal name="balance&#39;vc.3" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.019727" steps="37"/></proof>
-  <proof prover="6"><result status="valid" time="0.010000" steps="21784"/></proof>
+  <proof prover="2"><result status="valid" time="0.026876" steps="7182"/></proof>
   </goal>
   <goal name="balance&#39;vc.4" expl="precondition" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.017039" steps="41"/></proof>
+  <proof prover="2"><result status="valid" time="0.027740" steps="7269"/></proof>
   </goal>
   <goal name="balance&#39;vc.5" expl="precondition" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.021030" steps="30"/></proof>
+  <proof prover="2"><result status="valid" time="0.026840" steps="8500"/></proof>
   </goal>
   <goal name="balance&#39;vc.6" expl="precondition" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.014170" steps="32"/></proof>
+  <proof prover="2"><result status="valid" time="0.021401" steps="8550"/></proof>
   </goal>
   <goal name="balance&#39;vc.7" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.029450" steps="275"/></proof>
+  <proof prover="1"><result status="valid" time="0.030001" steps="253"/></proof>
   </goal>
   <goal name="balance&#39;vc.8" expl="precondition" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.013262" steps="34"/></proof>
+  <proof prover="2"><result status="valid" time="0.029633" steps="8012"/></proof>
   </goal>
   <goal name="balance&#39;vc.9" expl="type invariant" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.016629" steps="32"/></proof>
+  <proof prover="2"><result status="valid" time="0.018728" steps="8025"/></proof>
   </goal>
   <goal name="balance&#39;vc.10" expl="precondition" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.018433" steps="42"/></proof>
+  <proof prover="2"><result status="valid" time="0.026806" steps="8813"/></proof>
   </goal>
   <goal name="balance&#39;vc.11" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.030140" steps="342"/></proof>
+  <proof prover="2"><result status="valid" time="0.030164" steps="8826"/></proof>
   </goal>
   <goal name="balance&#39;vc.12" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.017055" steps="46"/></proof>
+  <proof prover="2"><result status="valid" time="0.025210" steps="8455"/></proof>
   </goal>
   <goal name="balance&#39;vc.13" expl="precondition" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.017662" steps="55"/></proof>
+  <proof prover="2"><result status="valid" time="0.027414" steps="8902"/></proof>
   </goal>
   <goal name="balance&#39;vc.14" expl="precondition" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.013139" steps="27"/></proof>
+  <proof prover="2"><result status="valid" time="0.035649" steps="13968"/></proof>
   </goal>
   <goal name="balance&#39;vc.15" expl="type invariant" proved="true">
-  <proof prover="1"><result status="valid" time="0.016824" steps="31"/></proof>
+  <proof prover="2"><result status="valid" time="0.031838" steps="14000"/></proof>
   </goal>
   <goal name="balance&#39;vc.16" expl="precondition" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.016968" steps="31"/></proof>
+  <proof prover="2"><result status="valid" time="0.032695" steps="14026"/></proof>
   </goal>
   <goal name="balance&#39;vc.17" expl="type invariant" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.023299" steps="35"/></proof>
+  <proof prover="2"><result status="valid" time="0.032925" steps="14714"/></proof>
   </goal>
   <goal name="balance&#39;vc.18" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.065421" steps="801"/></proof>
+  <proof prover="2"><result status="valid" time="0.031855" steps="14287"/></proof>
   </goal>
   <goal name="balance&#39;vc.19" expl="precondition" proved="true">
-  <proof prover="6"><result status="valid" time="0.020000" steps="80183"/></proof>
+  <proof prover="1"><result status="valid" time="0.027376" steps="145"/></proof>
   </goal>
   <goal name="balance&#39;vc.20" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.031464" steps="159"/></proof>
+  <proof prover="1"><result status="valid" time="0.025037" steps="160"/></proof>
   </goal>
   <goal name="balance&#39;vc.21" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.022650" steps="44"/></proof>
+  <proof prover="2"><result status="valid" time="0.027766" steps="13057"/></proof>
   </goal>
   <goal name="balance&#39;vc.22" expl="precondition" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.021571" steps="50"/></proof>
+  <proof prover="2"><result status="valid" time="0.039284" steps="14222"/></proof>
   </goal>
   <goal name="balance&#39;vc.23" expl="type invariant" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.023504" steps="91"/></proof>
+  <proof prover="2"><result status="valid" time="0.054215" steps="14786"/></proof>
   </goal>
   <goal name="balance&#39;vc.24" expl="postcondition" proved="true">
-  <proof prover="6"><result status="valid" time="0.134853" steps="533868"/></proof>
+  <proof prover="6"><result status="valid" time="0.162675" steps="533868"/></proof>
   </goal>
   <goal name="balance&#39;vc.25" expl="postcondition" proved="true">
-  <proof prover="2"><result status="valid" time="0.051851" steps="31209"/></proof>
+  <proof prover="2"><result status="valid" time="0.068768" steps="31209"/></proof>
   </goal>
   <goal name="balance&#39;vc.26" expl="postcondition" proved="true">
-  <proof prover="2"><result status="valid" time="0.055901" steps="31697"/></proof>
+  <proof prover="2"><result status="valid" time="0.081321" steps="31697"/></proof>
   </goal>
   <goal name="balance&#39;vc.27" expl="postcondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.762425" steps="12494"/></proof>
+  <transf name="split_vc" proved="true" >
+   <goal name="balance&#39;vc.27.0" expl="postcondition" proved="true">
+   <transf name="split_vc" proved="true" >
+    <goal name="balance&#39;vc.27.0.0" expl="postcondition" proved="true">
+    <proof prover="1"><result status="valid" time="0.317579" steps="4748"/></proof>
+    </goal>
+    <goal name="balance&#39;vc.27.0.1" expl="postcondition" proved="true">
+    <proof prover="2"><result status="valid" time="0.023882" steps="9580"/></proof>
+    </goal>
+   </transf>
+   </goal>
+   <goal name="balance&#39;vc.27.1" expl="postcondition" proved="true">
+   <proof prover="2"><result status="valid" time="0.034936" steps="14799"/></proof>
+   </goal>
+  </transf>
   </goal>
   <goal name="balance&#39;vc.28" expl="postcondition" proved="true">
   <transf name="split_vc" proved="true" >
@@ -379,31 +176,31 @@
     <goal name="balance&#39;vc.28.0.0" expl="postcondition" proved="true">
     <transf name="split_vc" proved="true" >
      <goal name="balance&#39;vc.28.0.0.0" expl="postcondition" proved="true">
-     <proof prover="6"><result status="valid" time="0.020983" steps="60681"/></proof>
+     <proof prover="2"><result status="valid" time="0.030612" steps="10284"/></proof>
      </goal>
      <goal name="balance&#39;vc.28.0.0.1" expl="postcondition" proved="true">
      <transf name="split_vc" proved="true" >
       <goal name="balance&#39;vc.28.0.0.1.0" expl="postcondition" proved="true">
       <transf name="split_vc" proved="true" >
        <goal name="balance&#39;vc.28.0.0.1.0.0" expl="postcondition" proved="true">
-       <proof prover="1" timelimit="5" memlimit="2000"><result status="valid" time="1.757249" steps="18684"/></proof>
+       <proof prover="1" timelimit="5" memlimit="2000"><result status="valid" time="2.064768" steps="25669"/></proof>
        </goal>
       </transf>
       </goal>
       <goal name="balance&#39;vc.28.0.0.1.1" expl="postcondition" proved="true">
-      <proof prover="6"><result status="valid" time="0.023508" steps="70154"/></proof>
+      <proof prover="2"><result status="valid" time="0.067133" steps="15773"/></proof>
       </goal>
      </transf>
      </goal>
     </transf>
     </goal>
     <goal name="balance&#39;vc.28.0.1" expl="postcondition" proved="true">
-    <proof prover="1"><result status="valid" time="0.137622" steps="1578"/></proof>
+    <proof prover="2"><result status="valid" time="0.069990" steps="18049"/></proof>
     </goal>
    </transf>
    </goal>
    <goal name="balance&#39;vc.28.1" expl="postcondition" proved="true">
-   <proof prover="1"><result status="valid" time="0.655707" steps="13418"/></proof>
+   <proof prover="1"><result status="valid" time="0.577337" steps="8934"/></proof>
    </goal>
   </transf>
   </goal>
@@ -412,159 +209,20 @@
    <goal name="balance&#39;vc.29.0" expl="postcondition" proved="true">
    <transf name="split_vc" proved="true" >
     <goal name="balance&#39;vc.29.0.0" expl="postcondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="balance&#39;vc.29.0.0.0" expl="postcondition" proved="true">
-     <transf name="split_vc" proved="true" >
-      <goal name="balance&#39;vc.29.0.0.0.0" expl="postcondition" proved="true">
-      <transf name="split_vc" proved="true" >
-       <goal name="balance&#39;vc.29.0.0.0.0.0" expl="postcondition" proved="true">
-       <proof prover="1"><result status="valid" time="0.033811" steps="216"/></proof>
-       </goal>
-      </transf>
-      </goal>
-     </transf>
-     </goal>
-     <goal name="balance&#39;vc.29.0.0.1" expl="postcondition" proved="true">
-     <transf name="split_vc" proved="true" >
-      <goal name="balance&#39;vc.29.0.0.1.0" expl="postcondition" proved="true">
-      <transf name="split_vc" proved="true" >
-       <goal name="balance&#39;vc.29.0.0.1.0.0" expl="postcondition" proved="true">
-       <proof prover="1"><result status="valid" time="0.146817" steps="1753"/></proof>
-       </goal>
-      </transf>
-      </goal>
-      <goal name="balance&#39;vc.29.0.0.1.1" expl="postcondition" proved="true">
-      <proof prover="1"><result status="valid" time="0.140138" steps="1739"/></proof>
-      </goal>
-     </transf>
-     </goal>
-    </transf>
+    <proof prover="2"><result status="valid" time="0.097664" steps="23172"/></proof>
     </goal>
     <goal name="balance&#39;vc.29.0.1" expl="postcondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="balance&#39;vc.29.0.1.0" expl="postcondition" proved="true">
-     <proof prover="1"><result status="valid" time="0.019638" steps="28"/></proof>
-     </goal>
-     <goal name="balance&#39;vc.29.0.1.1" expl="postcondition" proved="true">
-     <transf name="split_vc" proved="true" >
-      <goal name="balance&#39;vc.29.0.1.1.0" expl="postcondition" proved="true">
-      <proof prover="1"><result status="valid" time="0.448280" steps="5009"/></proof>
-      </goal>
-      <goal name="balance&#39;vc.29.0.1.1.1" expl="postcondition" proved="true">
-      <transf name="split_vc" proved="true" >
-       <goal name="balance&#39;vc.29.0.1.1.1.0" expl="postcondition" proved="true">
-       <proof prover="1"><result status="valid" time="0.026188" steps="49"/></proof>
-       </goal>
-       <goal name="balance&#39;vc.29.0.1.1.1.1" expl="postcondition" proved="true">
-       <transf name="split_vc" proved="true" >
-        <goal name="balance&#39;vc.29.0.1.1.1.1.0" expl="postcondition" proved="true">
-        <transf name="inline_goal" proved="true" >
-         <goal name="balance&#39;vc.29.0.1.1.1.1.0.0" expl="postcondition" proved="true">
-         <transf name="split_all_full" proved="true" >
-          <goal name="balance&#39;vc.29.0.1.1.1.1.0.0.0" expl="VC for balance" proved="true">
-          <proof prover="1"><result status="valid" time="0.036665" steps="141"/></proof>
-          </goal>
-          <goal name="balance&#39;vc.29.0.1.1.1.1.0.0.1" expl="VC for balance" proved="true">
-          <transf name="inline_goal" proved="true" >
-           <goal name="balance&#39;vc.29.0.1.1.1.1.0.0.1.0" expl="VC for balance" proved="true">
-           <transf name="split_all_full" proved="true" >
-            <goal name="balance&#39;vc.29.0.1.1.1.1.0.0.1.0.0" expl="VC for balance" proved="true">
-            <proof prover="1"><result status="valid" time="0.030924" steps="142"/></proof>
-            </goal>
-            <goal name="balance&#39;vc.29.0.1.1.1.1.0.0.1.0.1" expl="VC for balance" proved="true">
-            <proof prover="1"><result status="valid" time="0.027041" steps="142"/></proof>
-            </goal>
-            <goal name="balance&#39;vc.29.0.1.1.1.1.0.0.1.0.2" expl="VC for balance" proved="true">
-            <proof prover="1"><result status="valid" time="0.033688" steps="142"/></proof>
-            </goal>
-           </transf>
-           </goal>
-          </transf>
-          </goal>
-          <goal name="balance&#39;vc.29.0.1.1.1.1.0.0.2" expl="VC for balance" proved="true">
-          <proof prover="1"><result status="valid" time="0.088182" steps="1043"/></proof>
-          </goal>
-          <goal name="balance&#39;vc.29.0.1.1.1.1.0.0.3" expl="VC for balance" proved="true">
-          <proof prover="1"><result status="valid" time="0.091471" steps="1029"/></proof>
-          </goal>
-          <goal name="balance&#39;vc.29.0.1.1.1.1.0.0.4" expl="VC for balance" proved="true">
-          <proof prover="1"><result status="valid" time="0.082642" steps="1077"/></proof>
-          </goal>
-         </transf>
-         </goal>
-        </transf>
-        </goal>
-       </transf>
-       </goal>
-      </transf>
-      </goal>
-     </transf>
-     </goal>
-    </transf>
+    <proof prover="1"><result status="valid" time="0.717166" steps="9822"/></proof>
     </goal>
    </transf>
    </goal>
    <goal name="balance&#39;vc.29.1" expl="postcondition" proved="true">
    <transf name="split_vc" proved="true" >
     <goal name="balance&#39;vc.29.1.0" expl="postcondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="balance&#39;vc.29.1.0.0" expl="postcondition" proved="true">
-     <transf name="split_vc" proved="true" >
-      <goal name="balance&#39;vc.29.1.0.0.0" expl="postcondition" proved="true">
-      <proof prover="1"><result status="valid" time="0.030618" steps="343"/></proof>
-      </goal>
-      <goal name="balance&#39;vc.29.1.0.0.1" expl="postcondition" proved="true">
-      <transf name="split_vc" proved="true" >
-       <goal name="balance&#39;vc.29.1.0.0.1.0" expl="postcondition" proved="true">
-       <transf name="split_vc" proved="true" >
-        <goal name="balance&#39;vc.29.1.0.0.1.0.0" expl="postcondition" proved="true">
-        <proof prover="1"><result status="valid" time="0.032837" steps="265"/></proof>
-        </goal>
-       </transf>
-       </goal>
-       <goal name="balance&#39;vc.29.1.0.0.1.1" expl="postcondition" proved="true">
-       <proof prover="1"><result status="valid" time="0.043298" steps="272"/></proof>
-       </goal>
-      </transf>
-      </goal>
-     </transf>
-     </goal>
-     <goal name="balance&#39;vc.29.1.0.1" expl="postcondition" proved="true">
-     <proof prover="1"><result status="valid" time="0.047357" steps="495"/></proof>
-     </goal>
-    </transf>
+    <proof prover="2"><result status="valid" time="0.305899" steps="79823"/></proof>
     </goal>
     <goal name="balance&#39;vc.29.1.1" expl="postcondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="balance&#39;vc.29.1.1.0" expl="postcondition" proved="true">
-     <transf name="split_vc" proved="true" >
-      <goal name="balance&#39;vc.29.1.1.0.0" expl="postcondition" proved="true">
-      <transf name="split_vc" proved="true" >
-       <goal name="balance&#39;vc.29.1.1.0.0.0" expl="postcondition" proved="true">
-       <proof prover="6" timelimit="5"><result status="valid" time="0.018697" steps="19316"/></proof>
-       </goal>
-      </transf>
-      </goal>
-      <goal name="balance&#39;vc.29.1.1.0.1" expl="postcondition" proved="true">
-      <transf name="split_vc" proved="true" >
-       <goal name="balance&#39;vc.29.1.1.0.1.0" expl="postcondition" proved="true">
-       <transf name="split_vc" proved="true" >
-        <goal name="balance&#39;vc.29.1.1.0.1.0.0" expl="postcondition" proved="true">
-        <proof prover="1"><result status="valid" time="0.020637" steps="126"/></proof>
-        </goal>
-       </transf>
-       </goal>
-       <goal name="balance&#39;vc.29.1.1.0.1.1" expl="postcondition" proved="true">
-       <proof prover="1"><result status="valid" time="0.026061" steps="132"/></proof>
-       </goal>
-      </transf>
-      </goal>
-     </transf>
-     </goal>
-     <goal name="balance&#39;vc.29.1.1.1" expl="postcondition" proved="true">
-     <proof prover="1"><result status="valid" time="0.844238" steps="11422"/></proof>
-     </goal>
-    </transf>
+    <proof prover="1"><result status="valid" time="0.567772" steps="8344"/></proof>
     </goal>
    </transf>
    </goal>
@@ -575,454 +233,25 @@
    <goal name="balance&#39;vc.30.0" expl="postcondition" proved="true">
    <transf name="split_vc" proved="true" >
     <goal name="balance&#39;vc.30.0.0" expl="postcondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="balance&#39;vc.30.0.0.0" expl="postcondition" proved="true">
-     <transf name="split_vc" proved="true" >
-      <goal name="balance&#39;vc.30.0.0.0.0" expl="postcondition" proved="true">
-      <transf name="split_vc" proved="true" >
-       <goal name="balance&#39;vc.30.0.0.0.0.0" expl="postcondition" proved="true">
-       <transf name="split_vc" proved="true" >
-        <goal name="balance&#39;vc.30.0.0.0.0.0.0" expl="postcondition" proved="true">
-        <proof prover="1" timelimit="5" memlimit="2000"><result status="valid" time="0.034343" steps="216"/></proof>
-        </goal>
-       </transf>
-       </goal>
-      </transf>
-      </goal>
-     </transf>
-     </goal>
-     <goal name="balance&#39;vc.30.0.0.1" expl="postcondition" proved="true">
-     <proof prover="1"><result status="valid" time="0.124771" steps="1752"/></proof>
-     </goal>
-    </transf>
+    <proof prover="2"><result status="valid" time="0.066215" steps="18609"/></proof>
     </goal>
     <goal name="balance&#39;vc.30.0.1" expl="postcondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="balance&#39;vc.30.0.1.0" expl="postcondition" proved="true">
-     <transf name="split_vc" proved="true" >
-      <goal name="balance&#39;vc.30.0.1.0.0" expl="postcondition" proved="true">
-      <proof prover="1"><result status="valid" time="0.014499" steps="58"/></proof>
-      </goal>
-      <goal name="balance&#39;vc.30.0.1.0.1" expl="postcondition" proved="true">
-      <transf name="split_vc" proved="true" >
-       <goal name="balance&#39;vc.30.0.1.0.1.0" expl="postcondition" proved="true">
-       <proof prover="1"><result status="valid" time="0.020931" steps="34"/></proof>
-       </goal>
-       <goal name="balance&#39;vc.30.0.1.0.1.1" expl="postcondition" proved="true">
-       <transf name="split_vc" proved="true" >
-        <goal name="balance&#39;vc.30.0.1.0.1.1.0" expl="postcondition" proved="true">
-        <proof prover="1"><result status="valid" time="0.019028" steps="37"/></proof>
-        </goal>
-       </transf>
-       </goal>
-      </transf>
-      </goal>
-     </transf>
-     </goal>
-     <goal name="balance&#39;vc.30.0.1.1" expl="postcondition" proved="true">
-     <proof prover="1" timelimit="5"><result status="valid" time="1.832773" steps="30092"/></proof>
-     </goal>
-    </transf>
+    <proof prover="1"><result status="valid" time="0.609542" steps="9193"/></proof>
     </goal>
    </transf>
    </goal>
    <goal name="balance&#39;vc.30.1" expl="postcondition" proved="true">
-   <transf name="split_vc" proved="true" >
-    <goal name="balance&#39;vc.30.1.0" expl="postcondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="balance&#39;vc.30.1.0.0" expl="postcondition" proved="true">
-     <transf name="split_vc" proved="true" >
-      <goal name="balance&#39;vc.30.1.0.0.0" expl="postcondition" proved="true">
-      <proof prover="1"><result status="valid" time="0.036291" steps="345"/></proof>
-      </goal>
-      <goal name="balance&#39;vc.30.1.0.0.1" expl="postcondition" proved="true">
-      <transf name="split_vc" proved="true" >
-       <goal name="balance&#39;vc.30.1.0.0.1.0" expl="postcondition" proved="true">
-       <transf name="split_vc" proved="true" >
-        <goal name="balance&#39;vc.30.1.0.0.1.0.0" expl="postcondition" proved="true">
-        <transf name="inline_goal" proved="true" >
-         <goal name="balance&#39;vc.30.1.0.0.1.0.0.0" expl="postcondition" proved="true">
-         <transf name="split_all_full" proved="true" >
-          <goal name="balance&#39;vc.30.1.0.0.1.0.0.0.0" expl="VC for balance" proved="true">
-          <proof prover="1"><result status="valid" time="0.026877" steps="124"/></proof>
-          </goal>
-          <goal name="balance&#39;vc.30.1.0.0.1.0.0.0.1" expl="VC for balance" proved="true">
-          <transf name="inline_goal" proved="true" >
-           <goal name="balance&#39;vc.30.1.0.0.1.0.0.0.1.0" expl="VC for balance" proved="true">
-           <transf name="split_all_full" proved="true" >
-            <goal name="balance&#39;vc.30.1.0.0.1.0.0.0.1.0.0" expl="VC for balance" proved="true">
-            <transf name="inline_goal" proved="true" >
-             <goal name="balance&#39;vc.30.1.0.0.1.0.0.0.1.0.0.0" expl="VC for balance" proved="true">
-             <transf name="split_all_full" proved="true" >
-              <goal name="balance&#39;vc.30.1.0.0.1.0.0.0.1.0.0.0.0" expl="VC for balance" proved="true">
-              <proof prover="1"><result status="valid" time="0.019746" steps="124"/></proof>
-              </goal>
-              <goal name="balance&#39;vc.30.1.0.0.1.0.0.0.1.0.0.0.1" expl="VC for balance" proved="true">
-              <proof prover="1"><result status="valid" time="0.020221" steps="126"/></proof>
-              </goal>
-             </transf>
-             </goal>
-            </transf>
-            </goal>
-            <goal name="balance&#39;vc.30.1.0.0.1.0.0.0.1.0.1" expl="VC for balance" proved="true">
-            <proof prover="1" timelimit="30" memlimit="4000"><result status="valid" time="0.027652" steps="125"/></proof>
-            </goal>
-            <goal name="balance&#39;vc.30.1.0.0.1.0.0.0.1.0.2" expl="VC for balance" proved="true">
-            <proof prover="1" timelimit="30" memlimit="4000"><result status="valid" time="0.026442" steps="125"/></proof>
-            </goal>
-           </transf>
-           </goal>
-          </transf>
-          </goal>
-          <goal name="balance&#39;vc.30.1.0.0.1.0.0.0.2" expl="VC for balance" proved="true">
-          <proof prover="1"><result status="valid" time="0.032104" steps="275"/></proof>
-          </goal>
-          <goal name="balance&#39;vc.30.1.0.0.1.0.0.0.3" expl="VC for balance" proved="true">
-          <proof prover="1"><result status="valid" time="0.025464" steps="275"/></proof>
-          </goal>
-          <goal name="balance&#39;vc.30.1.0.0.1.0.0.0.4" expl="VC for balance" proved="true">
-          <proof prover="6"><result status="valid" time="0.012158" steps="62043"/></proof>
-          </goal>
-         </transf>
-         </goal>
-        </transf>
-        </goal>
-       </transf>
-       </goal>
-       <goal name="balance&#39;vc.30.1.0.0.1.1" expl="postcondition" proved="true">
-       <proof prover="1"><result status="valid" time="0.023035" steps="274"/></proof>
-       </goal>
-      </transf>
-      </goal>
-     </transf>
-     </goal>
-     <goal name="balance&#39;vc.30.1.0.1" expl="postcondition" proved="true">
-     <transf name="split_vc" proved="true" >
-      <goal name="balance&#39;vc.30.1.0.1.0" expl="postcondition" proved="true">
-      <proof prover="1"><result status="valid" time="0.040859" steps="508"/></proof>
-      </goal>
-      <goal name="balance&#39;vc.30.1.0.1.1" expl="postcondition" proved="true">
-      <transf name="split_vc" proved="true" >
-       <goal name="balance&#39;vc.30.1.0.1.1.0" expl="postcondition" proved="true">
-       <transf name="split_vc" proved="true" >
-        <goal name="balance&#39;vc.30.1.0.1.1.0.0" expl="postcondition" proved="true">
-        <transf name="inline_goal" proved="true" >
-         <goal name="balance&#39;vc.30.1.0.1.1.0.0.0" expl="postcondition" proved="true">
-         <transf name="split_all_full" proved="true" >
-          <goal name="balance&#39;vc.30.1.0.1.1.0.0.0.0" expl="VC for balance" proved="true">
-          <proof prover="1"><result status="valid" time="0.019205" steps="70"/></proof>
-          </goal>
-          <goal name="balance&#39;vc.30.1.0.1.1.0.0.0.1" expl="VC for balance" proved="true">
-          <proof prover="1"><result status="valid" time="0.018007" steps="70"/></proof>
-          </goal>
-          <goal name="balance&#39;vc.30.1.0.1.1.0.0.0.2" expl="VC for balance" proved="true">
-          <proof prover="1"><result status="valid" time="0.016155" steps="70"/></proof>
-          </goal>
-          <goal name="balance&#39;vc.30.1.0.1.1.0.0.0.3" expl="VC for balance" proved="true">
-          <proof prover="6"><result status="valid" time="0.012001" steps="8467"/></proof>
-          </goal>
-          <goal name="balance&#39;vc.30.1.0.1.1.0.0.0.4" expl="VC for balance" proved="true">
-          <proof prover="2"><result status="valid" time="0.035428" steps="9686"/></proof>
-          </goal>
-         </transf>
-         </goal>
-        </transf>
-        </goal>
-       </transf>
-       </goal>
-       <goal name="balance&#39;vc.30.1.0.1.1.1" expl="postcondition" proved="true">
-       <proof prover="1"><result status="valid" time="0.017441" steps="42"/></proof>
-       </goal>
-      </transf>
-      </goal>
-     </transf>
-     </goal>
-    </transf>
-    </goal>
-    <goal name="balance&#39;vc.30.1.1" expl="postcondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="balance&#39;vc.30.1.1.0" expl="postcondition" proved="true">
-     <transf name="split_vc" proved="true" >
-      <goal name="balance&#39;vc.30.1.1.0.0" expl="postcondition" proved="true">
-      <proof prover="1"><result status="valid" time="0.025872" steps="155"/></proof>
-      </goal>
-      <goal name="balance&#39;vc.30.1.1.0.1" expl="postcondition" proved="true">
-      <transf name="split_vc" proved="true" >
-       <goal name="balance&#39;vc.30.1.1.0.1.0" expl="postcondition" proved="true">
-       <transf name="split_vc" proved="true" >
-        <goal name="balance&#39;vc.30.1.1.0.1.0.0" expl="postcondition" proved="true">
-        <transf name="inline_goal" proved="true" >
-         <goal name="balance&#39;vc.30.1.1.0.1.0.0.0" expl="postcondition" proved="true">
-         <transf name="split_all_full" proved="true" >
-          <goal name="balance&#39;vc.30.1.1.0.1.0.0.0.0" expl="VC for balance" proved="true">
-          <proof prover="1"><result status="valid" time="0.019516" steps="128"/></proof>
-          </goal>
-          <goal name="balance&#39;vc.30.1.1.0.1.0.0.0.1" expl="VC for balance" proved="true">
-          <transf name="inline_goal" proved="true" >
-           <goal name="balance&#39;vc.30.1.1.0.1.0.0.0.1.0" expl="VC for balance" proved="true">
-           <transf name="split_all_full" proved="true" >
-            <goal name="balance&#39;vc.30.1.1.0.1.0.0.0.1.0.0" expl="VC for balance" proved="true">
-            <transf name="inline_goal" proved="true" >
-             <goal name="balance&#39;vc.30.1.1.0.1.0.0.0.1.0.0.0" expl="VC for balance" proved="true">
-             <transf name="split_all_full" proved="true" >
-              <goal name="balance&#39;vc.30.1.1.0.1.0.0.0.1.0.0.0.0" expl="VC for balance" proved="true">
-              <proof prover="1"><result status="valid" time="0.027214" steps="129"/></proof>
-              </goal>
-              <goal name="balance&#39;vc.30.1.1.0.1.0.0.0.1.0.0.0.1" expl="VC for balance" proved="true">
-              <proof prover="1"><result status="valid" time="0.023616" steps="130"/></proof>
-              </goal>
-             </transf>
-             </goal>
-            </transf>
-            </goal>
-            <goal name="balance&#39;vc.30.1.1.0.1.0.0.0.1.0.1" expl="VC for balance" proved="true">
-            <proof prover="1"><result status="valid" time="0.026468" steps="130"/></proof>
-            </goal>
-            <goal name="balance&#39;vc.30.1.1.0.1.0.0.0.1.0.2" expl="VC for balance" proved="true">
-            <proof prover="1"><result status="valid" time="0.023160" steps="130"/></proof>
-            </goal>
-           </transf>
-           </goal>
-          </transf>
-          </goal>
-          <goal name="balance&#39;vc.30.1.1.0.1.0.0.0.2" expl="VC for balance" proved="true">
-          <proof prover="1"><result status="valid" time="0.025605" steps="129"/></proof>
-          </goal>
-          <goal name="balance&#39;vc.30.1.1.0.1.0.0.0.3" expl="VC for balance" proved="true">
-          <proof prover="6"><result status="valid" time="0.012049" steps="21011"/></proof>
-          </goal>
-          <goal name="balance&#39;vc.30.1.1.0.1.0.0.0.4" expl="VC for balance" proved="true">
-          <proof prover="6"><result status="valid" time="0.012020" steps="21011"/></proof>
-          </goal>
-         </transf>
-         </goal>
-        </transf>
-        </goal>
-       </transf>
-       </goal>
-       <goal name="balance&#39;vc.30.1.1.0.1.1" expl="postcondition" proved="true">
-       <proof prover="1"><result status="valid" time="0.023641" steps="133"/></proof>
-       </goal>
-      </transf>
-      </goal>
-     </transf>
-     </goal>
-     <goal name="balance&#39;vc.30.1.1.1" expl="postcondition" proved="true">
-     <transf name="split_vc" proved="true" >
-      <goal name="balance&#39;vc.30.1.1.1.0" expl="postcondition" proved="true">
-      <transf name="split_vc" proved="true" >
-       <goal name="balance&#39;vc.30.1.1.1.0.0" expl="postcondition" proved="true">
-       <transf name="split_vc" proved="true" >
-        <goal name="balance&#39;vc.30.1.1.1.0.0.0" expl="postcondition" proved="true">
-        <proof prover="1" timelimit="5"><result status="valid" time="0.015098" steps="58"/></proof>
-        </goal>
-       </transf>
-       </goal>
-       <goal name="balance&#39;vc.30.1.1.1.0.1" expl="postcondition" proved="true">
-       <proof prover="0" timelimit="5"><result status="valid" time="0.041899" steps="13133"/></proof>
-       </goal>
-      </transf>
-      </goal>
-      <goal name="balance&#39;vc.30.1.1.1.1" expl="postcondition" proved="true">
-      <transf name="split_vc" proved="true" >
-       <goal name="balance&#39;vc.30.1.1.1.1.0" expl="postcondition" proved="true">
-       <transf name="split_vc" proved="true" >
-        <goal name="balance&#39;vc.30.1.1.1.1.0.0" expl="postcondition" proved="true">
-        <transf name="inline_goal" proved="true" >
-         <goal name="balance&#39;vc.30.1.1.1.1.0.0.0" expl="postcondition" proved="true">
-         <transf name="split_all_full" proved="true" >
-          <goal name="balance&#39;vc.30.1.1.1.1.0.0.0.0" expl="VC for balance" proved="true">
-          <proof prover="1"><result status="valid" time="0.026341" steps="107"/></proof>
-          </goal>
-          <goal name="balance&#39;vc.30.1.1.1.1.0.0.0.1" expl="VC for balance" proved="true">
-          <transf name="inline_goal" proved="true" >
-           <goal name="balance&#39;vc.30.1.1.1.1.0.0.0.1.0" expl="VC for balance" proved="true">
-           <transf name="split_all_full" proved="true" >
-            <goal name="balance&#39;vc.30.1.1.1.1.0.0.0.1.0.0" expl="VC for balance" proved="true">
-            <proof prover="1"><result status="valid" time="0.024651" steps="108"/></proof>
-            </goal>
-            <goal name="balance&#39;vc.30.1.1.1.1.0.0.0.1.0.1" expl="VC for balance" proved="true">
-            <proof prover="1"><result status="valid" time="0.026474" steps="108"/></proof>
-            </goal>
-            <goal name="balance&#39;vc.30.1.1.1.1.0.0.0.1.0.2" expl="VC for balance" proved="true">
-            <proof prover="1"><result status="valid" time="0.021430" steps="108"/></proof>
-            </goal>
-           </transf>
-           </goal>
-          </transf>
-          </goal>
-          <goal name="balance&#39;vc.30.1.1.1.1.0.0.0.2" expl="VC for balance" proved="true">
-          <proof prover="1"><result status="valid" time="0.044513" steps="368"/></proof>
-          </goal>
-          <goal name="balance&#39;vc.30.1.1.1.1.0.0.0.3" expl="VC for balance" proved="true">
-          <proof prover="1"><result status="valid" time="0.168561" steps="2220"/></proof>
-          </goal>
-          <goal name="balance&#39;vc.30.1.1.1.1.0.0.0.4" expl="VC for balance" proved="true">
-          <proof prover="1"><result status="valid" time="0.269693" steps="3881"/></proof>
-          </goal>
-         </transf>
-         </goal>
-        </transf>
-        </goal>
-       </transf>
-       </goal>
-       <goal name="balance&#39;vc.30.1.1.1.1.1" expl="postcondition" proved="true">
-       <proof prover="1"><result status="valid" time="0.044128" steps="470"/></proof>
-       </goal>
-      </transf>
-      </goal>
-     </transf>
-     </goal>
-    </transf>
-    </goal>
-   </transf>
-   </goal>
-  </transf>
-  </goal>
-  <goal name="balance&#39;vc.31" expl="postcondition" proved="true">
-  <transf name="split_vc" proved="true" >
-   <goal name="balance&#39;vc.31.0" expl="postcondition" proved="true">
-   <transf name="split_vc" proved="true" >
-    <goal name="balance&#39;vc.31.0.0" expl="postcondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="balance&#39;vc.31.0.0.0" expl="postcondition" proved="true">
-     <transf name="split_vc" proved="true" >
-      <goal name="balance&#39;vc.31.0.0.0.0" expl="postcondition" proved="true">
-      <transf name="split_vc" proved="true" >
-       <goal name="balance&#39;vc.31.0.0.0.0.0" expl="postcondition" proved="true">
-       <proof prover="1"><result status="valid" time="0.042428" steps="219"/></proof>
-       </goal>
-      </transf>
-      </goal>
-     </transf>
-     </goal>
-     <goal name="balance&#39;vc.31.0.0.1" expl="postcondition" proved="true">
-     <transf name="split_vc" proved="true" >
-      <goal name="balance&#39;vc.31.0.0.1.0" expl="postcondition" proved="true">
-      <transf name="split_vc" proved="true" >
-       <goal name="balance&#39;vc.31.0.0.1.0.0" expl="postcondition" proved="true">
-       <proof prover="0" timelimit="5"><result status="valid" time="0.059225" steps="25265"/></proof>
-       </goal>
-      </transf>
-      </goal>
-      <goal name="balance&#39;vc.31.0.0.1.1" expl="postcondition" proved="true">
-      <proof prover="1" timelimit="5"><result status="valid" time="0.489676" steps="6484"/></proof>
-      </goal>
-     </transf>
-     </goal>
-    </transf>
-    </goal>
-    <goal name="balance&#39;vc.31.0.1" expl="postcondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="balance&#39;vc.31.0.1.0" expl="postcondition" proved="true">
-     <proof prover="1"><result status="valid" time="0.012934" steps="28"/></proof>
-     </goal>
-     <goal name="balance&#39;vc.31.0.1.1" expl="postcondition" proved="true">
-     <transf name="split_vc" proved="true" >
-      <goal name="balance&#39;vc.31.0.1.1.0" expl="postcondition" proved="true">
-      <proof prover="1"><result status="valid" time="0.121069" steps="1554"/></proof>
-      </goal>
-      <goal name="balance&#39;vc.31.0.1.1.1" expl="postcondition" proved="true">
-      <transf name="split_vc" proved="true" >
-       <goal name="balance&#39;vc.31.0.1.1.1.0" expl="postcondition" proved="true">
-       <transf name="split_vc" proved="true" >
-        <goal name="balance&#39;vc.31.0.1.1.1.0.0" expl="postcondition" proved="true">
-        <proof prover="1"><result status="valid" time="0.019932" steps="49"/></proof>
-        </goal>
-       </transf>
-       </goal>
-       <goal name="balance&#39;vc.31.0.1.1.1.1" expl="postcondition" proved="true">
-       <proof prover="1"><result status="valid" time="0.562291" steps="6229"/></proof>
-       </goal>
-      </transf>
-      </goal>
-     </transf>
-     </goal>
-    </transf>
-    </goal>
-   </transf>
-   </goal>
-   <goal name="balance&#39;vc.31.1" expl="postcondition" proved="true">
-   <transf name="split_vc" proved="true" >
-    <goal name="balance&#39;vc.31.1.0" expl="postcondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="balance&#39;vc.31.1.0.0" expl="postcondition" proved="true">
-     <transf name="split_vc" proved="true" >
-      <goal name="balance&#39;vc.31.1.0.0.0" expl="postcondition" proved="true">
-      <transf name="split_vc" proved="true" >
-       <goal name="balance&#39;vc.31.1.0.0.0.0" expl="postcondition" proved="true">
-       <proof prover="1"><result status="valid" time="0.037173" steps="353"/></proof>
-       </goal>
-      </transf>
-      </goal>
-      <goal name="balance&#39;vc.31.1.0.0.1" expl="postcondition" proved="true">
-      <proof prover="1"><result status="valid" time="0.054561" steps="281"/></proof>
-      </goal>
-     </transf>
-     </goal>
-     <goal name="balance&#39;vc.31.1.0.1" expl="postcondition" proved="true">
-     <proof prover="1" timelimit="5"><result status="valid" time="0.044842" steps="534"/></proof>
-     </goal>
-    </transf>
-    </goal>
-    <goal name="balance&#39;vc.31.1.1" expl="postcondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="balance&#39;vc.31.1.1.0" expl="postcondition" proved="true">
-     <transf name="split_vc" proved="true" >
-      <goal name="balance&#39;vc.31.1.1.0.0" expl="postcondition" proved="true">
-      <transf name="split_vc" proved="true" >
-       <goal name="balance&#39;vc.31.1.1.0.0.0" expl="postcondition" proved="true">
-       <proof prover="1"><result status="valid" time="0.029782" steps="156"/></proof>
-       </goal>
-      </transf>
-      </goal>
-      <goal name="balance&#39;vc.31.1.1.0.1" expl="postcondition" proved="true">
-      <proof prover="1"><result status="valid" time="0.037239" steps="134"/></proof>
-      </goal>
-     </transf>
-     </goal>
-     <goal name="balance&#39;vc.31.1.1.1" expl="postcondition" proved="true">
-     <transf name="split_vc" proved="true" >
-      <goal name="balance&#39;vc.31.1.1.1.0" expl="postcondition" proved="true">
-      <proof prover="1" timelimit="5"><result status="valid" time="0.016349" steps="28"/></proof>
-      </goal>
-      <goal name="balance&#39;vc.31.1.1.1.1" expl="postcondition" proved="true">
-      <transf name="split_vc" proved="true" >
-       <goal name="balance&#39;vc.31.1.1.1.1.0" expl="postcondition" proved="true">
-       <proof prover="1"><result status="valid" time="0.074529" steps="843"/></proof>
-       </goal>
-       <goal name="balance&#39;vc.31.1.1.1.1.1" expl="postcondition" proved="true">
-       <transf name="split_vc" proved="true" >
-        <goal name="balance&#39;vc.31.1.1.1.1.1.0" expl="postcondition" proved="true">
-        <transf name="inline_goal" proved="true" >
-         <goal name="balance&#39;vc.31.1.1.1.1.1.0.0" expl="postcondition" proved="true">
-         <transf name="split_all_full" proved="true" >
-          <goal name="balance&#39;vc.31.1.1.1.1.1.0.0.0" expl="VC for balance" proved="true">
-          <transf name="split_vc" proved="true" >
-           <goal name="balance&#39;vc.31.1.1.1.1.1.0.0.0.0" expl="VC for balance" proved="true">
-           <transf name="inline_goal" proved="true" >
-            <goal name="balance&#39;vc.31.1.1.1.1.1.0.0.0.0.0" expl="VC for balance" proved="true">
-            <proof prover="1"><result status="valid" time="0.046885" steps="425"/></proof>
-            </goal>
-           </transf>
-           </goal>
-          </transf>
-          </goal>
-          <goal name="balance&#39;vc.31.1.1.1.1.1.0.0.1" expl="VC for balance" proved="true">
-          <proof prover="1"><result status="valid" time="0.047909" steps="433"/></proof>
-          </goal>
-         </transf>
-         </goal>
-        </transf>
-        </goal>
-        <goal name="balance&#39;vc.31.1.1.1.1.1.1" expl="postcondition" proved="true">
-        <proof prover="1"><result status="valid" time="0.020087" steps="54"/></proof>
-        </goal>
-       </transf>
-       </goal>
-      </transf>
-      </goal>
-     </transf>
+   <transf name="split_vc" proved="true" >
+    <goal name="balance&#39;vc.30.1.0" expl="postcondition" proved="true">
+    <proof prover="2"><result status="valid" time="0.299458" steps="80096"/></proof>
+    </goal>
+    <goal name="balance&#39;vc.30.1.1" expl="postcondition" proved="true">
+    <transf name="split_vc" proved="true" >
+     <goal name="balance&#39;vc.30.1.1.0" expl="postcondition" proved="true">
+     <proof prover="2"><result status="valid" time="0.024211" steps="9554"/></proof>
+     </goal>
+     <goal name="balance&#39;vc.30.1.1.1" expl="postcondition" proved="true">
+     <proof prover="1"><result status="valid" time="0.455720" steps="6451"/></proof>
      </goal>
     </transf>
     </goal>
@@ -1030,6 +259,23 @@
    </goal>
   </transf>
   </goal>
+  <goal name="balance&#39;vc.31" expl="postcondition" proved="true">
+  <transf name="split_vc" proved="true" >
+   <goal name="balance&#39;vc.31.0" expl="postcondition" proved="true">
+   <transf name="split_vc" proved="true" >
+    <goal name="balance&#39;vc.31.0.0" expl="postcondition" proved="true">
+    <proof prover="1"><result status="valid" time="0.538269" steps="8352"/></proof>
+    </goal>
+    <goal name="balance&#39;vc.31.0.1" expl="postcondition" proved="true">
+    <proof prover="1"><result status="valid" time="0.726211" steps="9517"/></proof>
+    </goal>
+   </transf>
+   </goal>
+   <goal name="balance&#39;vc.31.1" expl="postcondition" proved="true">
+   <proof prover="2"><result status="valid" time="0.451178" steps="63891"/></proof>
+   </goal>
+  </transf>
+  </goal>
  </transf>
  </goal>
 </theory>
@@ -1037,123 +283,107 @@
  <goal name="move_red_left&#39;vc" expl="VC for move_red_left" proved="true">
  <transf name="split_vc" proved="true" >
   <goal name="move_red_left&#39;vc.0" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.017039" steps="32"/></proof>
+  <proof prover="2"><result status="valid" time="0.025380" steps="7567"/></proof>
   </goal>
   <goal name="move_red_left&#39;vc.1" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.025763" steps="169"/></proof>
+  <proof prover="2"><result status="valid" time="0.039250" steps="10170"/></proof>
   </goal>
   <goal name="move_red_left&#39;vc.2" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.014530" steps="35"/></proof>
+  <proof prover="2"><result status="valid" time="0.029019" steps="7627"/></proof>
   </goal>
   <goal name="move_red_left&#39;vc.3" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.038964" steps="284"/></proof>
+  <proof prover="1"><result status="valid" time="0.031293" steps="299"/></proof>
   </goal>
   <goal name="move_red_left&#39;vc.4" expl="precondition" proved="true">
-  <proof prover="2"><result status="valid" time="0.034036" steps="7766"/></proof>
+  <proof prover="2"><result status="valid" time="0.030164" steps="7766"/></proof>
   </goal>
   <goal name="move_red_left&#39;vc.5" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.021234" steps="92"/></proof>
+  <proof prover="2"><result status="valid" time="0.027498" steps="9296"/></proof>
   </goal>
   <goal name="move_red_left&#39;vc.6" expl="precondition" proved="true">
-  <proof prover="6"><result status="valid" time="0.014981" steps="25422"/></proof>
+  <proof prover="2"><result status="valid" time="0.028426" steps="8118"/></proof>
   </goal>
   <goal name="move_red_left&#39;vc.7" expl="precondition" proved="true">
-  <proof prover="6"><result status="valid" time="0.012453" steps="4791"/></proof>
+  <proof prover="2"><result status="valid" time="0.023275" steps="7572"/></proof>
   </goal>
   <goal name="move_red_left&#39;vc.8" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.028871" steps="100"/></proof>
+  <proof prover="2"><result status="valid" time="0.027597" steps="9934"/></proof>
   </goal>
   <goal name="move_red_left&#39;vc.9" expl="type invariant" proved="true">
-  <proof prover="1"><result status="valid" time="0.019982" steps="100"/></proof>
+  <proof prover="2"><result status="valid" time="0.023701" steps="7614"/></proof>
   </goal>
   <goal name="move_red_left&#39;vc.10" expl="type invariant" proved="true">
-  <proof prover="1"><result status="valid" time="0.039251" steps="100"/></proof>
+  <proof prover="2"><result status="valid" time="0.025184" steps="7612"/></proof>
   </goal>
   <goal name="move_red_left&#39;vc.11" expl="precondition" proved="true">
-  <proof prover="6"><result status="valid" time="0.023332" steps="66639"/></proof>
+  <proof prover="2"><result status="valid" time="0.030433" steps="10299"/></proof>
   </goal>
   <goal name="move_red_left&#39;vc.12" expl="precondition" proved="true">
-  <proof prover="6"><result status="valid" time="0.024712" steps="75075"/></proof>
+  <proof prover="2"><result status="valid" time="0.031688" steps="11359"/></proof>
   </goal>
   <goal name="move_red_left&#39;vc.13" expl="precondition" proved="true">
-  <proof prover="6"><result status="valid" time="0.012073" steps="5068"/></proof>
+  <proof prover="2"><result status="valid" time="0.022182" steps="7906"/></proof>
   </goal>
   <goal name="move_red_left&#39;vc.14" expl="precondition" proved="true">
-  <proof prover="2"><result status="valid" time="0.121904" steps="21620"/></proof>
+  <proof prover="2"><result status="valid" time="0.079657" steps="21620"/></proof>
   </goal>
   <goal name="move_red_left&#39;vc.15" expl="precondition" proved="true">
-  <proof prover="6"><result status="valid" time="0.032594" steps="81190"/></proof>
+  <proof prover="2"><result status="valid" time="0.034201" steps="11558"/></proof>
   </goal>
   <goal name="move_red_left&#39;vc.16" expl="precondition" proved="true">
-  <proof prover="2"><result status="valid" time="0.042189" steps="10693"/></proof>
+  <proof prover="2"><result status="valid" time="0.030782" steps="10693"/></proof>
   </goal>
   <goal name="move_red_left&#39;vc.17" expl="type invariant" proved="true">
-  <proof prover="2"><result status="valid" time="0.045212" steps="11036"/></proof>
+  <proof prover="2"><result status="valid" time="0.032664" steps="11036"/></proof>
   </goal>
   <goal name="move_red_left&#39;vc.18" expl="precondition" proved="true">
-  <transf name="split_vc" proved="true" >
-   <goal name="move_red_left&#39;vc.18.0" expl="precondition" proved="true">
-   <proof prover="0" timelimit="5"><result status="valid" time="2.086509" steps="620231"/></proof>
-   </goal>
-  </transf>
+  <proof prover="2"><result status="valid" time="0.772393" steps="124961"/></proof>
   </goal>
   <goal name="move_red_left&#39;vc.19" expl="precondition" proved="true">
-  <proof prover="6" timelimit="5"><result status="valid" time="0.025949" steps="98077"/></proof>
+  <proof prover="2"><result status="valid" time="0.148238" steps="31587"/></proof>
   </goal>
   <goal name="move_red_left&#39;vc.20" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.030211" steps="174"/></proof>
+  <proof prover="2"><result status="valid" time="0.036054" steps="11169"/></proof>
   </goal>
   <goal name="move_red_left&#39;vc.21" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.038025" steps="206"/></proof>
+  <proof prover="2"><result status="valid" time="0.028637" steps="9409"/></proof>
   </goal>
   <goal name="move_red_left&#39;vc.22" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.037516" steps="208"/></proof>
+  <proof prover="2"><result status="valid" time="0.029557" steps="9902"/></proof>
   </goal>
   <goal name="move_red_left&#39;vc.23" expl="precondition" proved="true">
-  <proof prover="6"><result status="valid" time="0.032686" steps="101706"/></proof>
+  <proof prover="2"><result status="valid" time="0.045871" steps="15293"/></proof>
   </goal>
   <goal name="move_red_left&#39;vc.24" expl="precondition" proved="true">
-  <proof prover="2"><result status="valid" time="0.046981" steps="14216"/></proof>
+  <proof prover="2"><result status="valid" time="0.042832" steps="14216"/></proof>
   </goal>
   <goal name="move_red_left&#39;vc.25" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.033867" steps="214"/></proof>
+  <proof prover="2"><result status="valid" time="0.034841" steps="11679"/></proof>
   </goal>
   <goal name="move_red_left&#39;vc.26" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.037140" steps="266"/></proof>
+  <proof prover="2"><result status="valid" time="0.035876" steps="12463"/></proof>
   </goal>
   <goal name="move_red_left&#39;vc.27" expl="precondition" proved="true">
-  <proof prover="6"><result status="valid" time="0.017381" steps="40049"/></proof>
+  <proof prover="2"><result status="valid" time="0.035251" steps="10928"/></proof>
   </goal>
   <goal name="move_red_left&#39;vc.28" expl="precondition" proved="true">
-  <proof prover="2"><result status="valid" time="0.025749" steps="9188"/></proof>
+  <proof prover="2"><result status="valid" time="0.017150" steps="9188"/></proof>
   </goal>
   <goal name="move_red_left&#39;vc.29" expl="type invariant" proved="true">
-  <proof prover="6"><result status="valid" time="0.011680" steps="93584"/></proof>
+  <proof prover="2"><result status="valid" time="0.038594" steps="12839"/></proof>
   </goal>
   <goal name="move_red_left&#39;vc.30" expl="type invariant" proved="true">
-  <proof prover="6"><result status="valid" time="0.028805" steps="94203"/></proof>
+  <proof prover="2"><result status="valid" time="0.036075" steps="12889"/></proof>
   </goal>
   <goal name="move_red_left&#39;vc.31" expl="postcondition" proved="true">
   <transf name="split_vc" proved="true" >
    <goal name="move_red_left&#39;vc.31.0" expl="postcondition" proved="true">
-   <transf name="split_vc" proved="true" >
-    <goal name="move_red_left&#39;vc.31.0.0" expl="postcondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="move_red_left&#39;vc.31.0.0.0" expl="postcondition" proved="true">
-     <proof prover="2" timelimit="5" memlimit="2000"><result status="valid" time="0.034613" steps="10827"/></proof>
-     </goal>
-    </transf>
-    </goal>
-   </transf>
+   <proof prover="2"><result status="valid" time="0.029420" steps="10826"/></proof>
    </goal>
    <goal name="move_red_left&#39;vc.31.1" expl="postcondition" proved="true">
    <transf name="split_vc" proved="true" >
     <goal name="move_red_left&#39;vc.31.1.0" expl="postcondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="move_red_left&#39;vc.31.1.0.0" expl="postcondition" proved="true">
-     <proof prover="2" timelimit="5" memlimit="2000"><result status="valid" time="0.221860" steps="35733"/></proof>
-     </goal>
-    </transf>
+    <proof prover="2"><result status="valid" time="0.174510" steps="36450"/></proof>
     </goal>
    </transf>
    </goal>
@@ -1162,20 +392,12 @@
   <goal name="move_red_left&#39;vc.32" expl="postcondition" proved="true">
   <transf name="split_vc" proved="true" >
    <goal name="move_red_left&#39;vc.32.0" expl="postcondition" proved="true">
-   <transf name="split_vc" proved="true" >
-    <goal name="move_red_left&#39;vc.32.0.0" expl="postcondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="move_red_left&#39;vc.32.0.0.0" expl="postcondition" proved="true">
-     <proof prover="2" timelimit="5" memlimit="2000"><result status="valid" time="0.034505" steps="8125"/></proof>
-     </goal>
-    </transf>
-    </goal>
-   </transf>
+   <proof prover="2"><result status="valid" time="0.029028" steps="8125"/></proof>
    </goal>
    <goal name="move_red_left&#39;vc.32.1" expl="postcondition" proved="true">
    <transf name="split_vc" proved="true" >
     <goal name="move_red_left&#39;vc.32.1.0" expl="postcondition" proved="true">
-    <proof prover="2" timelimit="5"><result status="valid" time="1.018467" steps="118782"/></proof>
+    <proof prover="2"><result status="valid" time="0.826184" steps="118782"/></proof>
     </goal>
    </transf>
    </goal>
@@ -1184,52 +406,32 @@
   <goal name="move_red_left&#39;vc.33" expl="postcondition" proved="true">
   <transf name="split_vc" proved="true" >
    <goal name="move_red_left&#39;vc.33.0" expl="postcondition" proved="true">
-   <transf name="split_vc" proved="true" >
-    <goal name="move_red_left&#39;vc.33.0.0" expl="postcondition" proved="true">
-    <proof prover="6"><result status="valid" time="0.108855" steps="70364"/></proof>
-    </goal>
-   </transf>
+   <proof prover="2"><result status="valid" time="0.032868" steps="11223"/></proof>
    </goal>
    <goal name="move_red_left&#39;vc.33.1" expl="postcondition" proved="true">
-   <transf name="split_vc" proved="true" >
-    <goal name="move_red_left&#39;vc.33.1.0" expl="postcondition" proved="true">
-    <proof prover="6"><result status="valid" time="0.097783" steps="365133"/></proof>
-    </goal>
-   </transf>
+   <proof prover="2"><result status="valid" time="0.786640" steps="94196"/></proof>
    </goal>
   </transf>
   </goal>
   <goal name="move_red_left&#39;vc.34" expl="postcondition" proved="true">
   <transf name="split_vc" proved="true" >
    <goal name="move_red_left&#39;vc.34.0" expl="postcondition" proved="true">
-   <transf name="split_vc" proved="true" >
-    <goal name="move_red_left&#39;vc.34.0.0" expl="postcondition" proved="true">
-    <proof prover="6"><result status="valid" time="0.032923" steps="62025"/></proof>
-    </goal>
-   </transf>
+   <proof prover="2"><result status="valid" time="0.037219" steps="11268"/></proof>
    </goal>
    <goal name="move_red_left&#39;vc.34.1" expl="postcondition" proved="true">
-   <transf name="split_vc" proved="true" >
-    <goal name="move_red_left&#39;vc.34.1.0" expl="postcondition" proved="true">
-    <proof prover="0"><result status="valid" time="0.231402" steps="31598"/></proof>
-    </goal>
-   </transf>
+   <proof prover="2"><result status="valid" time="0.647486" steps="112325"/></proof>
    </goal>
   </transf>
   </goal>
   <goal name="move_red_left&#39;vc.35" expl="postcondition" proved="true">
   <transf name="split_vc" proved="true" >
    <goal name="move_red_left&#39;vc.35.0" expl="postcondition" proved="true">
-   <transf name="split_vc" proved="true" >
-    <goal name="move_red_left&#39;vc.35.0.0" expl="postcondition" proved="true">
-    <proof prover="6"><result status="valid" time="0.025734" steps="71066"/></proof>
-    </goal>
-   </transf>
+   <proof prover="2"><result status="valid" time="0.043056" steps="12180"/></proof>
    </goal>
    <goal name="move_red_left&#39;vc.35.1" expl="postcondition" proved="true">
    <transf name="split_vc" proved="true" >
     <goal name="move_red_left&#39;vc.35.1.0" expl="postcondition" proved="true">
-    <proof prover="6"><result status="valid" time="0.175051" steps="345316"/></proof>
+    <proof prover="6"><result status="valid" time="0.098172" steps="345316"/></proof>
     </goal>
    </transf>
    </goal>
@@ -1238,16 +440,12 @@
   <goal name="move_red_left&#39;vc.36" expl="postcondition" proved="true">
   <transf name="split_vc" proved="true" >
    <goal name="move_red_left&#39;vc.36.0" expl="postcondition" proved="true">
-   <transf name="split_vc" proved="true" >
-    <goal name="move_red_left&#39;vc.36.0.0" expl="postcondition" proved="true">
-    <proof prover="6"><result status="valid" time="0.104577" steps="72546"/></proof>
-    </goal>
-   </transf>
+   <proof prover="2"><result status="valid" time="0.037931" steps="12304"/></proof>
    </goal>
    <goal name="move_red_left&#39;vc.36.1" expl="postcondition" proved="true">
    <transf name="split_vc" proved="true" >
     <goal name="move_red_left&#39;vc.36.1.0" expl="postcondition" proved="true">
-    <proof prover="6" timelimit="5"><result status="valid" time="0.202648" steps="705761"/></proof>
+    <proof prover="6"><result status="valid" time="0.255463" steps="705761"/></proof>
     </goal>
    </transf>
    </goal>
@@ -1258,22 +456,14 @@
    <goal name="move_red_left&#39;vc.37.0" expl="postcondition" proved="true">
    <transf name="split_vc" proved="true" >
     <goal name="move_red_left&#39;vc.37.0.0" expl="postcondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="move_red_left&#39;vc.37.0.0.0" expl="postcondition" proved="true">
-     <transf name="split_vc" proved="true" >
-      <goal name="move_red_left&#39;vc.37.0.0.0.0" expl="postcondition" proved="true">
-      <proof prover="2" timelimit="5" memlimit="2000"><result status="valid" time="0.041879" steps="8526"/></proof>
-      </goal>
-     </transf>
-     </goal>
-    </transf>
+    <proof prover="2"><result status="valid" time="0.027343" steps="8526"/></proof>
     </goal>
     <goal name="move_red_left&#39;vc.37.0.1" expl="postcondition" proved="true">
     <transf name="split_vc" proved="true" >
      <goal name="move_red_left&#39;vc.37.0.1.0" expl="postcondition" proved="true">
      <transf name="split_vc" proved="true" >
       <goal name="move_red_left&#39;vc.37.0.1.0.0" expl="postcondition" proved="true">
-      <proof prover="2" timelimit="5" memlimit="2000"><result status="valid" time="1.486080" steps="172525"/></proof>
+      <proof prover="2" timelimit="5" memlimit="2000"><result status="valid" time="1.188345" steps="172136"/></proof>
       </goal>
      </transf>
      </goal>
@@ -1284,16 +474,12 @@
    <goal name="move_red_left&#39;vc.37.1" expl="postcondition" proved="true">
    <transf name="split_vc" proved="true" >
     <goal name="move_red_left&#39;vc.37.1.0" expl="postcondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="move_red_left&#39;vc.37.1.0.0" expl="postcondition" proved="true">
-     <proof prover="6"><result status="valid" time="0.095132" steps="73842"/></proof>
-     </goal>
-    </transf>
+    <proof prover="2"><result status="valid" time="0.039681" steps="12455"/></proof>
     </goal>
     <goal name="move_red_left&#39;vc.37.1.1" expl="postcondition" proved="true">
     <transf name="split_vc" proved="true" >
      <goal name="move_red_left&#39;vc.37.1.1.0" expl="postcondition" proved="true">
-     <proof prover="6"><result status="valid" time="0.105405" steps="421874"/></proof>
+     <proof prover="2"><result status="valid" time="0.980008" steps="136851"/></proof>
      </goal>
     </transf>
     </goal>
@@ -1304,16 +490,12 @@
   <goal name="move_red_left&#39;vc.38" expl="postcondition" proved="true">
   <transf name="split_vc" proved="true" >
    <goal name="move_red_left&#39;vc.38.0" expl="postcondition" proved="true">
-   <transf name="split_vc" proved="true" >
-    <goal name="move_red_left&#39;vc.38.0.0" expl="postcondition" proved="true">
-    <proof prover="2"><result status="valid" time="0.265439" steps="38572"/></proof>
-    </goal>
-   </transf>
+   <proof prover="2"><result status="valid" time="0.199031" steps="38564"/></proof>
    </goal>
    <goal name="move_red_left&#39;vc.38.1" expl="postcondition" proved="true">
    <transf name="split_vc" proved="true" >
     <goal name="move_red_left&#39;vc.38.1.0" expl="postcondition" proved="true">
-    <proof prover="2"><result status="valid" time="0.811474" steps="86916"/></proof>
+    <proof prover="2"><result status="valid" time="0.544283" steps="86916"/></proof>
     </goal>
    </transf>
    </goal>
@@ -1322,23 +504,19 @@
   <goal name="move_red_left&#39;vc.39" expl="postcondition" proved="true">
   <transf name="split_vc" proved="true" >
    <goal name="move_red_left&#39;vc.39.0" expl="postcondition" proved="true">
-   <transf name="split_vc" proved="true" >
-    <goal name="move_red_left&#39;vc.39.0.0" expl="postcondition" proved="true">
-    <proof prover="6"><result status="valid" time="0.117854" steps="17091"/></proof>
-    </goal>
-   </transf>
+   <proof prover="2"><result status="valid" time="0.023337" steps="8704"/></proof>
    </goal>
    <goal name="move_red_left&#39;vc.39.1" expl="postcondition" proved="true">
    <transf name="split_vc" proved="true" >
     <goal name="move_red_left&#39;vc.39.1.0" expl="postcondition" proved="true">
-    <proof prover="6"><result status="valid" time="0.104660" steps="447239"/></proof>
+    <proof prover="2"><result status="valid" time="0.728780" steps="102084"/></proof>
     </goal>
    </transf>
    </goal>
   </transf>
   </goal>
   <goal name="move_red_left&#39;vc.40" expl="postcondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.045154" steps="91"/></proof>
+  <proof prover="2"><result status="valid" time="0.044361" steps="14579"/></proof>
   </goal>
  </transf>
  </goal>
@@ -1347,152 +525,124 @@
  <goal name="move_red_right&#39;vc" expl="VC for move_red_right" proved="true">
  <transf name="split_vc" proved="true" >
   <goal name="move_red_right&#39;vc.0" expl="precondition" proved="true">
-  <proof prover="6"><result status="valid" time="0.020320" steps="18296"/></proof>
+  <proof prover="2"><result status="valid" time="0.028502" steps="7561"/></proof>
   </goal>
   <goal name="move_red_right&#39;vc.1" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.018466" steps="33"/></proof>
+  <proof prover="2"><result status="valid" time="0.025414" steps="7610"/></proof>
   </goal>
   <goal name="move_red_right&#39;vc.2" expl="precondition" proved="true">
-  <proof prover="6"><result status="valid" time="0.019241" steps="46597"/></proof>
+  <proof prover="2"><result status="valid" time="0.043234" steps="10206"/></proof>
   </goal>
   <goal name="move_red_right&#39;vc.3" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.033161" steps="253"/></proof>
+  <proof prover="1"><result status="valid" time="0.032414" steps="267"/></proof>
   </goal>
   <goal name="move_red_right&#39;vc.4" expl="precondition" proved="true">
-  <proof prover="6"><result status="valid" time="0.018636" steps="45641"/></proof>
+  <proof prover="2"><result status="valid" time="0.027238" steps="7766"/></proof>
   </goal>
   <goal name="move_red_right&#39;vc.5" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.019749" steps="92"/></proof>
+  <proof prover="2"><result status="valid" time="0.034562" steps="9296"/></proof>
   </goal>
   <goal name="move_red_right&#39;vc.6" expl="precondition" proved="true">
-  <proof prover="6"><result status="valid" time="0.015391" steps="25422"/></proof>
+  <proof prover="2"><result status="valid" time="0.027521" steps="8118"/></proof>
   </goal>
   <goal name="move_red_right&#39;vc.7" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.013692" steps="98"/></proof>
+  <proof prover="2"><result status="valid" time="0.017233" steps="7572"/></proof>
   </goal>
   <goal name="move_red_right&#39;vc.8" expl="precondition" proved="true">
-  <proof prover="2"><result status="valid" time="0.041446" steps="9934"/></proof>
+  <proof prover="2"><result status="valid" time="0.034902" steps="9934"/></proof>
   </goal>
   <goal name="move_red_right&#39;vc.9" expl="type invariant" proved="true">
-  <proof prover="6"><result status="valid" time="0.025834" steps="4828"/></proof>
+  <proof prover="2"><result status="valid" time="0.022719" steps="7614"/></proof>
   </goal>
   <goal name="move_red_right&#39;vc.10" expl="type invariant" proved="true">
-  <proof prover="1"><result status="valid" time="0.020593" steps="100"/></proof>
+  <proof prover="2"><result status="valid" time="0.018621" steps="7612"/></proof>
   </goal>
   <goal name="move_red_right&#39;vc.11" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.074649" steps="897"/></proof>
+  <proof prover="2"><result status="valid" time="0.034746" steps="10971"/></proof>
   </goal>
   <goal name="move_red_right&#39;vc.12" expl="precondition" proved="true">
-  <proof prover="6"><result status="valid" time="0.026439" steps="76505"/></proof>
+  <proof prover="2"><result status="valid" time="0.094718" steps="20792"/></proof>
   </goal>
   <goal name="move_red_right&#39;vc.13" expl="precondition" proved="true">
-  <proof prover="2"><result status="valid" time="0.039519" steps="10166"/></proof>
+  <proof prover="2"><result status="valid" time="0.030358" steps="10166"/></proof>
   </goal>
   <goal name="move_red_right&#39;vc.14" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.031902" steps="148"/></proof>
+  <proof prover="2"><result status="valid" time="0.024700" steps="8522"/></proof>
   </goal>
   <goal name="move_red_right&#39;vc.15" expl="precondition" proved="true">
-  <proof prover="6"><result status="valid" time="0.084011" steps="318467"/></proof>
+  <proof prover="2"><result status="valid" time="0.102250" steps="23572"/></proof>
   </goal>
   <goal name="move_red_right&#39;vc.16" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.038429" steps="152"/></proof>
+  <proof prover="2"><result status="valid" time="0.035431" steps="8928"/></proof>
   </goal>
   <goal name="move_red_right&#39;vc.17" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.116384" steps="1350"/></proof>
+  <proof prover="2"><result status="valid" time="0.033874" steps="11631"/></proof>
   </goal>
   <goal name="move_red_right&#39;vc.18" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.026700" steps="156"/></proof>
+  <proof prover="2"><result status="valid" time="0.035310" steps="10676"/></proof>
   </goal>
   <goal name="move_red_right&#39;vc.19" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.035252" steps="208"/></proof>
+  <proof prover="2"><result status="valid" time="0.040428" steps="11460"/></proof>
   </goal>
   <goal name="move_red_right&#39;vc.20" expl="precondition" proved="true">
-  <proof prover="6"><result status="valid" time="0.015704" steps="31630"/></proof>
+  <proof prover="2"><result status="valid" time="0.021604" steps="9925"/></proof>
   </goal>
   <goal name="move_red_right&#39;vc.21" expl="precondition" proved="true">
-  <proof prover="6"><result status="valid" time="0.011740" steps="5766"/></proof>
+  <proof prover="2"><result status="valid" time="0.015331" steps="8631"/></proof>
   </goal>
   <goal name="move_red_right&#39;vc.22" expl="type invariant" proved="true">
-  <proof prover="6"><result status="valid" time="0.011666" steps="77927"/></proof>
+  <proof prover="2"><result status="valid" time="0.029266" steps="11836"/></proof>
   </goal>
   <goal name="move_red_right&#39;vc.23" expl="type invariant" proved="true">
-  <proof prover="6"><result status="valid" time="0.025369" steps="78516"/></proof>
+  <proof prover="2"><result status="valid" time="0.029725" steps="11886"/></proof>
   </goal>
   <goal name="move_red_right&#39;vc.24" expl="postcondition" proved="true">
   <transf name="split_vc" proved="true" >
    <goal name="move_red_right&#39;vc.24.0" expl="postcondition" proved="true">
-   <proof prover="2"><result status="valid" time="0.042319" steps="10826"/></proof>
+   <proof prover="2"><result status="valid" time="0.035313" steps="10826"/></proof>
    </goal>
    <goal name="move_red_right&#39;vc.24.1" expl="postcondition" proved="true">
-   <transf name="split_vc" proved="true" >
-    <goal name="move_red_right&#39;vc.24.1.0" expl="postcondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="move_red_right&#39;vc.24.1.0.0" expl="postcondition" proved="true">
-     <proof prover="2" timelimit="5" memlimit="2000"><result status="valid" time="0.191284" steps="29827"/></proof>
-     </goal>
-    </transf>
-    </goal>
-   </transf>
+   <proof prover="2"><result status="valid" time="0.618127" steps="95121"/></proof>
    </goal>
   </transf>
   </goal>
   <goal name="move_red_right&#39;vc.25" expl="postcondition" proved="true">
   <transf name="split_vc" proved="true" >
    <goal name="move_red_right&#39;vc.25.0" expl="postcondition" proved="true">
+   <proof prover="2"><result status="valid" time="0.022484" steps="8125"/></proof>
+   </goal>
+   <goal name="move_red_right&#39;vc.25.1" expl="postcondition" proved="true">
    <transf name="split_vc" proved="true" >
-    <goal name="move_red_right&#39;vc.25.0.0" expl="postcondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="move_red_right&#39;vc.25.0.0.0" expl="postcondition" proved="true">
-     <proof prover="2" timelimit="5" memlimit="2000"><result status="valid" time="0.019516" steps="8125"/></proof>
-     </goal>
-    </transf>
+    <goal name="move_red_right&#39;vc.25.1.0" expl="postcondition" proved="true">
+    <proof prover="2"><result status="valid" time="0.659562" steps="123693"/></proof>
     </goal>
    </transf>
    </goal>
-   <goal name="move_red_right&#39;vc.25.1" expl="postcondition" proved="true">
-   <proof prover="2" timelimit="5"><result status="valid" time="1.351389" steps="148724"/></proof>
-   </goal>
   </transf>
   </goal>
   <goal name="move_red_right&#39;vc.26" expl="postcondition" proved="true">
-  <proof prover="6" timelimit="5"><result status="valid" time="0.533162" steps="1533782"/></proof>
+  <proof prover="2"><result status="valid" time="0.633550" steps="83720"/></proof>
   </goal>
   <goal name="move_red_right&#39;vc.27" expl="postcondition" proved="true">
-  <proof prover="2"><result status="valid" time="0.735659" steps="68747"/></proof>
+  <proof prover="2"><result status="valid" time="0.438720" steps="68922"/></proof>
   </goal>
   <goal name="move_red_right&#39;vc.28" expl="postcondition" proved="true">
   <transf name="split_vc" proved="true" >
    <goal name="move_red_right&#39;vc.28.0" expl="postcondition" proved="true">
-   <proof prover="6"><result status="valid" time="0.016754" steps="71038"/></proof>
+   <proof prover="2"><result status="valid" time="0.043521" steps="12173"/></proof>
    </goal>
    <goal name="move_red_right&#39;vc.28.1" expl="postcondition" proved="true">
-   <transf name="split_vc" proved="true" >
-    <goal name="move_red_right&#39;vc.28.1.0" expl="postcondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="move_red_right&#39;vc.28.1.0.0" expl="postcondition" proved="true">
-     <proof prover="6" timelimit="5"><result status="valid" time="0.046975" steps="140221"/></proof>
-     </goal>
-    </transf>
-    </goal>
-   </transf>
+   <proof prover="2"><result status="valid" time="0.688021" steps="90558"/></proof>
    </goal>
   </transf>
   </goal>
   <goal name="move_red_right&#39;vc.29" expl="postcondition" proved="true">
   <transf name="split_vc" proved="true" >
    <goal name="move_red_right&#39;vc.29.0" expl="postcondition" proved="true">
-   <transf name="split_vc" proved="true" >
-    <goal name="move_red_right&#39;vc.29.0.0" expl="postcondition" proved="true">
-    <proof prover="2"><result status="valid" time="0.025919" steps="12297"/></proof>
-    </goal>
-   </transf>
+   <proof prover="2"><result status="valid" time="0.048755" steps="12297"/></proof>
    </goal>
    <goal name="move_red_right&#39;vc.29.1" expl="postcondition" proved="true">
-   <transf name="split_vc" proved="true" >
-    <goal name="move_red_right&#39;vc.29.1.0" expl="postcondition" proved="true">
-    <proof prover="6"><result status="valid" time="0.046951" steps="475662"/></proof>
-    </goal>
-   </transf>
+   <proof prover="2"><result status="valid" time="0.896570" steps="116494"/></proof>
    </goal>
   </transf>
   </goal>
@@ -1501,24 +651,12 @@
    <goal name="move_red_right&#39;vc.30.0" expl="postcondition" proved="true">
    <transf name="split_vc" proved="true" >
     <goal name="move_red_right&#39;vc.30.0.0" expl="postcondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="move_red_right&#39;vc.30.0.0.0" expl="postcondition" proved="true">
-     <transf name="split_vc" proved="true" >
-      <goal name="move_red_right&#39;vc.30.0.0.0.0" expl="postcondition" proved="true">
-      <proof prover="2" timelimit="5" memlimit="2000"><result status="valid" time="0.047996" steps="8526"/></proof>
-      </goal>
-     </transf>
-     </goal>
-    </transf>
+    <proof prover="2"><result status="valid" time="0.023498" steps="8526"/></proof>
     </goal>
     <goal name="move_red_right&#39;vc.30.0.1" expl="postcondition" proved="true">
     <transf name="split_vc" proved="true" >
      <goal name="move_red_right&#39;vc.30.0.1.0" expl="postcondition" proved="true">
-     <transf name="split_vc" proved="true" >
-      <goal name="move_red_right&#39;vc.30.0.1.0.0" expl="postcondition" proved="true">
-      <proof prover="2" timelimit="5" memlimit="2000"><result status="valid" time="1.032004" steps="124241"/></proof>
-      </goal>
-     </transf>
+     <proof prover="2"><result status="valid" time="0.782107" steps="124512"/></proof>
      </goal>
     </transf>
     </goal>
@@ -1527,14 +665,10 @@
    <goal name="move_red_right&#39;vc.30.1" expl="postcondition" proved="true">
    <transf name="split_vc" proved="true" >
     <goal name="move_red_right&#39;vc.30.1.0" expl="postcondition" proved="true">
-    <proof prover="6"><result status="valid" time="0.034894" steps="73814"/></proof>
+    <proof prover="2"><result status="valid" time="0.042343" steps="12448"/></proof>
     </goal>
     <goal name="move_red_right&#39;vc.30.1.1" expl="postcondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="move_red_right&#39;vc.30.1.1.0" expl="postcondition" proved="true">
-     <proof prover="6"><result status="valid" time="0.097045" steps="331305"/></proof>
-     </goal>
-    </transf>
+    <proof prover="2"><result status="valid" time="0.628705" steps="88226"/></proof>
     </goal>
    </transf>
    </goal>
@@ -1543,212 +677,153 @@
   <goal name="move_red_right&#39;vc.31" expl="postcondition" proved="true">
   <transf name="split_vc" proved="true" >
    <goal name="move_red_right&#39;vc.31.0" expl="postcondition" proved="true">
-   <proof prover="2"><result status="valid" time="0.362595" steps="38873"/></proof>
+   <proof prover="2"><result status="valid" time="0.196948" steps="38551"/></proof>
    </goal>
    <goal name="move_red_right&#39;vc.31.1" expl="postcondition" proved="true">
-   <transf name="split_vc" proved="true" >
-    <goal name="move_red_right&#39;vc.31.1.0" expl="postcondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="move_red_right&#39;vc.31.1.0.0" expl="postcondition" proved="true">
-     <proof prover="2"><result status="valid" time="0.555726" steps="65662"/></proof>
-     </goal>
-    </transf>
-    </goal>
-   </transf>
+   <proof prover="2"><result status="valid" time="0.611617" steps="84786"/></proof>
    </goal>
   </transf>
   </goal>
   <goal name="move_red_right&#39;vc.32" expl="postcondition" proved="true">
   <transf name="split_vc" proved="true" >
    <goal name="move_red_right&#39;vc.32.0" expl="postcondition" proved="true">
-   <proof prover="6"><result status="valid" time="0.021443" steps="17095"/></proof>
+   <proof prover="2"><result status="valid" time="0.030073" steps="8704"/></proof>
    </goal>
    <goal name="move_red_right&#39;vc.32.1" expl="postcondition" proved="true">
-   <proof prover="2" timelimit="5"><result status="valid" time="0.992764" steps="93863"/></proof>
+   <proof prover="2"><result status="valid" time="0.740629" steps="93863"/></proof>
    </goal>
   </transf>
   </goal>
   <goal name="move_red_right&#39;vc.33" expl="postcondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.030319" steps="91"/></proof>
+  <proof prover="2"><result status="valid" time="0.044528" steps="13019"/></proof>
   </goal>
  </transf>
  </goal>
 </theory>
 <theory name="RedBlackTree_Impl15_New" proved="true">
  <goal name="new&#39;vc" expl="VC for new" proved="true">
- <proof prover="1"><result status="valid" time="0.018979" steps="50"/></proof>
+ <proof prover="1"><result status="valid" time="0.017859" steps="40"/></proof>
  </goal>
 </theory>
 <theory name="RedBlackTree_Impl15_InsertRec" proved="true">
  <goal name="insert_rec&#39;vc" expl="VC for insert_rec" proved="true">
  <transf name="split_vc" proved="true" >
   <goal name="insert_rec&#39;vc.0" expl="type invariant" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.019509" steps="54"/></proof>
+  <proof prover="2"><result status="valid" time="0.027340" steps="6857"/></proof>
   </goal>
   <goal name="insert_rec&#39;vc.1" expl="precondition" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.021081" steps="58"/></proof>
+  <proof prover="2"><result status="valid" time="0.027864" steps="6868"/></proof>
   </goal>
   <goal name="insert_rec&#39;vc.2" expl="precondition" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.020590" steps="58"/></proof>
+  <proof prover="2"><result status="valid" time="0.017991" steps="6493"/></proof>
   </goal>
   <goal name="insert_rec&#39;vc.3" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.033678" steps="304"/></proof>
+  <proof prover="2"><result status="valid" time="0.037904" steps="10560"/></proof>
   </goal>
   <goal name="insert_rec&#39;vc.4" expl="precondition" proved="true">
-  <proof prover="2"><result status="valid" time="0.164455" steps="10555"/></proof>
+  <proof prover="2"><result status="valid" time="0.044732" steps="10555"/></proof>
   </goal>
   <goal name="insert_rec&#39;vc.5" expl="precondition" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.020940" steps="74"/></proof>
+  <proof prover="2"><result status="valid" time="0.025351" steps="7362"/></proof>
   </goal>
   <goal name="insert_rec&#39;vc.6" expl="precondition" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.013264" steps="74"/></proof>
+  <proof prover="2"><result status="valid" time="0.019984" steps="5932"/></proof>
   </goal>
   <goal name="insert_rec&#39;vc.7" expl="precondition" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.022458" steps="74"/></proof>
+  <proof prover="2"><result status="valid" time="0.020369" steps="5933"/></proof>
   </goal>
   <goal name="insert_rec&#39;vc.8" expl="type invariant" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.015849" steps="60"/></proof>
+  <proof prover="2"><result status="valid" time="0.020761" steps="6514"/></proof>
   </goal>
   <goal name="insert_rec&#39;vc.9" expl="type invariant" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.019540" steps="68"/></proof>
+  <proof prover="2"><result status="valid" time="0.025143" steps="7312"/></proof>
   </goal>
   <goal name="insert_rec&#39;vc.10" expl="type invariant" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.020805" steps="72"/></proof>
+  <proof prover="2"><result status="valid" time="0.029089" steps="7329"/></proof>
   </goal>
   <goal name="insert_rec&#39;vc.11" expl="type invariant" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.018815" steps="76"/></proof>
+  <proof prover="2"><result status="valid" time="0.028920" steps="7424"/></proof>
   </goal>
   <goal name="insert_rec&#39;vc.12" expl="type invariant" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.014339" steps="80"/></proof>
+  <proof prover="2"><result status="valid" time="0.022605" steps="7519"/></proof>
   </goal>
   <goal name="insert_rec&#39;vc.13" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.034491" steps="313"/></proof>
+  <proof prover="2"><result status="valid" time="0.046219" steps="10510"/></proof>
   </goal>
   <goal name="insert_rec&#39;vc.14" expl="precondition" proved="true">
-  <proof prover="2"><result status="valid" time="0.140985" steps="10505"/></proof>
+  <proof prover="2"><result status="valid" time="0.043177" steps="10505"/></proof>
   </goal>
   <goal name="insert_rec&#39;vc.15" expl="precondition" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.019969" steps="74"/></proof>
+  <proof prover="2"><result status="valid" time="0.029137" steps="7374"/></proof>
   </goal>
   <goal name="insert_rec&#39;vc.16" expl="precondition" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.019112" steps="74"/></proof>
+  <proof prover="2"><result status="valid" time="0.017481" steps="5938"/></proof>
   </goal>
   <goal name="insert_rec&#39;vc.17" expl="precondition" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.017844" steps="74"/></proof>
+  <proof prover="2"><result status="valid" time="0.021095" steps="5939"/></proof>
   </goal>
   <goal name="insert_rec&#39;vc.18" expl="unreachable point" proved="true">
-  <proof prover="1"><result status="valid" time="0.015778" steps="51"/></proof>
+  <proof prover="2"><result status="valid" time="0.026535" steps="6581"/></proof>
   </goal>
   <goal name="insert_rec&#39;vc.19" expl="type invariant" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.021749" steps="42"/></proof>
+  <proof prover="2"><result status="valid" time="0.027243" steps="6732"/></proof>
   </goal>
   <goal name="insert_rec&#39;vc.20" expl="type invariant" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.022655" steps="65"/></proof>
+  <proof prover="2"><result status="valid" time="0.029543" steps="7739"/></proof>
   </goal>
   <goal name="insert_rec&#39;vc.21" expl="type invariant" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.016759" steps="68"/></proof>
+  <proof prover="2"><result status="valid" time="0.019635" steps="7756"/></proof>
   </goal>
   <goal name="insert_rec&#39;vc.22" expl="precondition" proved="true">
-  <transf name="split_vc" proved="true" >
-   <goal name="insert_rec&#39;vc.22.0" expl="precondition" proved="true">
-   <transf name="split_vc" proved="true" >
-    <goal name="insert_rec&#39;vc.22.0.0" expl="precondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="insert_rec&#39;vc.22.0.0.0" expl="precondition" proved="true">
-     <proof prover="0"><result status="valid" time="0.597325" steps="55371"/></proof>
-     </goal>
-     <goal name="insert_rec&#39;vc.22.0.0.1" expl="precondition" proved="true">
-     <proof prover="0"><result status="valid" time="0.708242" steps="72564"/></proof>
-     </goal>
-    </transf>
-    </goal>
-   </transf>
-   </goal>
-  </transf>
+  <proof prover="2"><result status="valid" time="0.524649" steps="94925"/></proof>
   </goal>
   <goal name="insert_rec&#39;vc.23" expl="precondition" proved="true">
-  <proof prover="2"><result status="valid" time="0.072172" steps="22602"/></proof>
+  <proof prover="2"><result status="valid" time="0.104900" steps="22602"/></proof>
   </goal>
   <goal name="insert_rec&#39;vc.24" expl="precondition" proved="true">
-  <proof prover="2"><result status="valid" time="0.079353" steps="23337"/></proof>
+  <proof prover="2"><result status="valid" time="0.104577" steps="23337"/></proof>
   </goal>
   <goal name="insert_rec&#39;vc.25" expl="precondition" proved="true">
-  <proof prover="2"><result status="valid" time="0.151582" steps="22359"/></proof>
+  <proof prover="2"><result status="valid" time="0.098321" steps="22359"/></proof>
   </goal>
   <goal name="insert_rec&#39;vc.26" expl="precondition" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.028465" steps="44"/></proof>
+  <proof prover="2"><result status="valid" time="0.028597" steps="9107"/></proof>
   </goal>
   <goal name="insert_rec&#39;vc.27" expl="type invariant" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.032215" steps="59"/></proof>
+  <proof prover="2"><result status="valid" time="0.033609" steps="9950"/></proof>
   </goal>
   <goal name="insert_rec&#39;vc.28" expl="type invariant" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.023913" steps="61"/></proof>
+  <proof prover="2"><result status="valid" time="0.033752" steps="10040"/></proof>
   </goal>
   <goal name="insert_rec&#39;vc.29" expl="type invariant" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.031854" steps="63"/></proof>
+  <proof prover="2"><result status="valid" time="0.030617" steps="10129"/></proof>
   </goal>
   <goal name="insert_rec&#39;vc.30" expl="postcondition" proved="true">
-  <transf name="split_vc" proved="true" >
-   <goal name="insert_rec&#39;vc.30.0" expl="postcondition" proved="true">
-   <proof prover="2"><result status="valid" time="0.250926" steps="40183"/></proof>
-   </goal>
-   <goal name="insert_rec&#39;vc.30.1" expl="postcondition" proved="true">
-   <proof prover="2"><result status="valid" time="0.146306" steps="30705"/></proof>
-   </goal>
-  </transf>
+  <proof prover="2"><result status="valid" time="0.857572" steps="123246"/></proof>
   </goal>
   <goal name="insert_rec&#39;vc.31" expl="postcondition" proved="true">
-  <transf name="split_vc" proved="true" >
-   <goal name="insert_rec&#39;vc.31.0" expl="postcondition" proved="true">
-   <transf name="split_vc" proved="true" >
-    <goal name="insert_rec&#39;vc.31.0.0" expl="postcondition" proved="true">
-    <proof prover="0"><result status="valid" time="0.380353" steps="80942"/></proof>
-    </goal>
-   </transf>
-   </goal>
-   <goal name="insert_rec&#39;vc.31.1" expl="postcondition" proved="true">
-   <proof prover="0"><result status="valid" time="0.411899" steps="45403"/></proof>
-   </goal>
-  </transf>
+  <proof prover="2"><result status="valid" time="0.583810" steps="88803"/></proof>
   </goal>
   <goal name="insert_rec&#39;vc.32" expl="postcondition" proved="true">
   <transf name="split_vc" proved="true" >
    <goal name="insert_rec&#39;vc.32.0" expl="postcondition" proved="true">
-   <proof prover="2"><result status="valid" time="0.391047" steps="35357"/></proof>
+   <proof prover="2"><result status="valid" time="0.194073" steps="35357"/></proof>
    </goal>
    <goal name="insert_rec&#39;vc.32.1" expl="postcondition" proved="true">
-   <proof prover="2"><result status="valid" time="0.148772" steps="27384"/></proof>
+   <proof prover="2"><result status="valid" time="0.145583" steps="27376"/></proof>
    </goal>
   </transf>
   </goal>
   <goal name="insert_rec&#39;vc.33" expl="postcondition" proved="true">
-  <transf name="split_vc" proved="true" >
-   <goal name="insert_rec&#39;vc.33.0" expl="postcondition" proved="true">
-   <transf name="split_vc" proved="true" >
-    <goal name="insert_rec&#39;vc.33.0.0" expl="postcondition" proved="true">
-    <proof prover="2"><result status="valid" time="0.150021" steps="23643"/></proof>
-    </goal>
-   </transf>
-   </goal>
-   <goal name="insert_rec&#39;vc.33.1" expl="postcondition" proved="true">
-   <transf name="split_vc" proved="true" >
-    <goal name="insert_rec&#39;vc.33.1.0" expl="postcondition" proved="true">
-    <proof prover="2"><result status="valid" time="0.090963" steps="13469"/></proof>
-    </goal>
-    <goal name="insert_rec&#39;vc.33.1.1" expl="postcondition" proved="true">
-    <proof prover="1"><result status="valid" time="0.049550" steps="651"/></proof>
-    </goal>
-   </transf>
-   </goal>
-  </transf>
+  <proof prover="2"><result status="valid" time="0.917550" steps="129977"/></proof>
   </goal>
   <goal name="insert_rec&#39;vc.34" expl="postcondition" proved="true">
   <transf name="split_vc" proved="true" >
    <goal name="insert_rec&#39;vc.34.0" expl="postcondition" proved="true">
-   <proof prover="6" timelimit="5"><result status="valid" time="1.860423" steps="1765632"/></proof>
+   <proof prover="2"><result status="valid" time="0.686888" steps="79823"/></proof>
    </goal>
    <goal name="insert_rec&#39;vc.34.1" expl="postcondition" proved="true">
-   <proof prover="6" timelimit="5"><result status="valid" time="0.168717" steps="263100"/></proof>
+   <proof prover="2"><result status="valid" time="0.178467" steps="31493"/></proof>
    </goal>
   </transf>
   </goal>
@@ -1757,242 +832,145 @@
 </theory>
 <theory name="RedBlackTree_Impl15_Insert" proved="true">
  <goal name="insert&#39;vc" expl="VC for insert" proved="true">
- <transf name="split_vc" proved="true" >
-  <goal name="insert&#39;vc.0" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.021423" steps="34"/></proof>
-  </goal>
-  <goal name="insert&#39;vc.1" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.010419" steps="36"/></proof>
-  </goal>
-  <goal name="insert&#39;vc.2" expl="precondition" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.020851" steps="38"/></proof>
-  </goal>
-  <goal name="insert&#39;vc.3" expl="precondition" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.016243" steps="38"/></proof>
-  </goal>
-  <goal name="insert&#39;vc.4" expl="precondition" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.013391" steps="38"/></proof>
-  </goal>
-  <goal name="insert&#39;vc.5" expl="precondition" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.020407" steps="55"/></proof>
-  </goal>
-  <goal name="insert&#39;vc.6" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.040645" steps="368"/></proof>
-  </goal>
-  <goal name="insert&#39;vc.7" expl="precondition" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.013937" steps="58"/></proof>
-  </goal>
-  <goal name="insert&#39;vc.8" expl="type invariant" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.024326" steps="66"/></proof>
-  </goal>
-  <goal name="insert&#39;vc.9" expl="type invariant" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.023348" steps="70"/></proof>
-  </goal>
-  <goal name="insert&#39;vc.10" expl="postcondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.199730" steps="2506"/></proof>
-  </goal>
-  <goal name="insert&#39;vc.11" expl="postcondition" proved="true">
-  <proof prover="0"><result status="valid" time="0.409455" steps="79299"/></proof>
-  </goal>
- </transf>
+ <proof prover="0"><result status="valid" time="0.357990" steps="128178"/></proof>
  </goal>
 </theory>
 <theory name="RedBlackTree_Impl15_DeleteMaxRec" proved="true">
  <goal name="delete_max_rec&#39;vc" expl="VC for delete_max_rec" proved="true">
  <transf name="split_vc" proved="true" >
   <goal name="delete_max_rec&#39;vc.0" expl="precondition" proved="true">
-  <proof prover="6"><result status="valid" time="0.022921" steps="49045"/></proof>
+  <proof prover="2"><result status="valid" time="0.024823" steps="7927"/></proof>
   </goal>
   <goal name="delete_max_rec&#39;vc.1" expl="precondition" proved="true">
-  <proof prover="6"><result status="valid" time="0.021415" steps="56711"/></proof>
+  <proof prover="1"><result status="valid" time="0.025889" steps="233"/></proof>
   </goal>
   <goal name="delete_max_rec&#39;vc.2" expl="precondition" proved="true">
-  <proof prover="2"><result status="valid" time="0.051418" steps="7524"/></proof>
+  <proof prover="2"><result status="valid" time="0.022319" steps="7524"/></proof>
   </goal>
   <goal name="delete_max_rec&#39;vc.3" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.026258" steps="49"/></proof>
+  <proof prover="2"><result status="valid" time="0.026736" steps="8200"/></proof>
   </goal>
   <goal name="delete_max_rec&#39;vc.4" expl="type invariant" proved="true">
-  <proof prover="6"><result status="valid" time="0.022180" steps="52476"/></proof>
+  <proof prover="2"><result status="valid" time="0.026463" steps="8228"/></proof>
   </goal>
   <goal name="delete_max_rec&#39;vc.5" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.015530" steps="59"/></proof>
+  <proof prover="2"><result status="valid" time="0.027371" steps="8340"/></proof>
   </goal>
   <goal name="delete_max_rec&#39;vc.6" expl="precondition" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.922868" steps="14892"/></proof>
+  <proof prover="1"><result status="valid" time="0.523252" steps="8321"/></proof>
   </goal>
   <goal name="delete_max_rec&#39;vc.7" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.017004" steps="66"/></proof>
+  <proof prover="2"><result status="valid" time="0.020131" steps="8264"/></proof>
   </goal>
   <goal name="delete_max_rec&#39;vc.8" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.015696" steps="72"/></proof>
+  <proof prover="2"><result status="valid" time="0.031364" steps="8573"/></proof>
   </goal>
   <goal name="delete_max_rec&#39;vc.9" expl="type invariant" proved="true">
-  <proof prover="1"><result status="valid" time="0.017106" steps="38"/></proof>
+  <proof prover="2"><result status="valid" time="0.022103" steps="9578"/></proof>
   </goal>
   <goal name="delete_max_rec&#39;vc.10" expl="precondition" proved="true">
-  <proof prover="6"><result status="valid" time="0.012310" steps="60548"/></proof>
+  <proof prover="2"><result status="valid" time="0.030332" steps="9989"/></proof>
   </goal>
   <goal name="delete_max_rec&#39;vc.11" expl="type invariant" proved="true">
-  <proof prover="6"><result status="valid" time="0.024447" steps="65022"/></proof>
+  <proof prover="2"><result status="valid" time="0.036114" steps="10050"/></proof>
   </goal>
   <goal name="delete_max_rec&#39;vc.12" expl="type invariant" proved="true">
-  <proof prover="6"><result status="valid" time="0.029009" steps="66358"/></proof>
+  <proof prover="2"><result status="valid" time="0.036896" steps="10172"/></proof>
   </goal>
   <goal name="delete_max_rec&#39;vc.13" expl="precondition" proved="true">
-  <proof prover="6"><result status="valid" time="0.033938" steps="318996"/></proof>
+  <proof prover="2"><result status="valid" time="0.097433" steps="22782"/></proof>
   </goal>
   <goal name="delete_max_rec&#39;vc.14" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.016098" steps="64"/></proof>
+  <proof prover="2"><result status="valid" time="0.031352" steps="8955"/></proof>
   </goal>
   <goal name="delete_max_rec&#39;vc.15" expl="type invariant" proved="true">
-  <proof prover="2"><result status="valid" time="0.028633" steps="8686"/></proof>
+  <proof prover="2"><result status="valid" time="0.020546" steps="8686"/></proof>
   </goal>
   <goal name="delete_max_rec&#39;vc.16" expl="precondition" proved="true">
-  <proof prover="2"><result status="valid" time="0.046194" steps="9564"/></proof>
+  <proof prover="2"><result status="valid" time="0.033016" steps="9564"/></proof>
   </goal>
   <goal name="delete_max_rec&#39;vc.17" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.017767" steps="40"/></proof>
+  <proof prover="2"><result status="valid" time="0.026162" steps="9465"/></proof>
   </goal>
   <goal name="delete_max_rec&#39;vc.18" expl="precondition" proved="true">
-  <proof prover="6"><result status="valid" time="0.012772" steps="7393"/></proof>
+  <proof prover="2"><result status="valid" time="0.030392" steps="8800"/></proof>
   </goal>
   <goal name="delete_max_rec&#39;vc.19" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.012694" steps="38"/></proof>
+  <proof prover="2"><result status="valid" time="0.023080" steps="8561"/></proof>
   </goal>
   <goal name="delete_max_rec&#39;vc.20" expl="type invariant" proved="true">
-  <proof prover="1"><result status="valid" time="0.018755" steps="36"/></proof>
+  <proof prover="2"><result status="valid" time="0.019860" steps="8571"/></proof>
   </goal>
   <goal name="delete_max_rec&#39;vc.21" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.025730" steps="47"/></proof>
+  <proof prover="2"><result status="valid" time="0.033016" steps="9737"/></proof>
   </goal>
   <goal name="delete_max_rec&#39;vc.22" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.263032" steps="3563"/></proof>
+  <proof prover="1"><result status="valid" time="0.263999" steps="3792"/></proof>
   </goal>
   <goal name="delete_max_rec&#39;vc.23" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.195095" steps="2456"/></proof>
+  <proof prover="1"><result status="valid" time="0.183838" steps="2244"/></proof>
   </goal>
   <goal name="delete_max_rec&#39;vc.24" expl="precondition" proved="true">
-  <transf name="split_vc" proved="true" >
-   <goal name="delete_max_rec&#39;vc.24.0" expl="precondition" proved="true">
-   <transf name="compute_hyp" proved="true" >
-    <goal name="delete_max_rec&#39;vc.24.0.0" expl="precondition" proved="true">
-    <proof prover="2"><result status="valid" time="0.208492" steps="49865"/></proof>
-    </goal>
-   </transf>
-   </goal>
-   <goal name="delete_max_rec&#39;vc.24.1" expl="precondition" proved="true">
-   <proof prover="1" timelimit="5"><result status="valid" time="0.034258" steps="131"/></proof>
-   </goal>
-  </transf>
+  <proof prover="1"><result status="valid" time="0.857051" steps="10897"/></proof>
   </goal>
   <goal name="delete_max_rec&#39;vc.25" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.031647" steps="61"/></proof>
+  <proof prover="2"><result status="valid" time="0.028410" steps="10283"/></proof>
   </goal>
   <goal name="delete_max_rec&#39;vc.26" expl="type invariant" proved="true">
-  <proof prover="1"><result status="valid" time="0.018565" steps="73"/></proof>
+  <proof prover="2"><result status="valid" time="0.026326" steps="10801"/></proof>
   </goal>
   <goal name="delete_max_rec&#39;vc.27" expl="type invariant" proved="true">
-  <proof prover="1"><result status="valid" time="0.026577" steps="78"/></proof>
+  <proof prover="2"><result status="valid" time="0.038300" steps="10943"/></proof>
   </goal>
   <goal name="delete_max_rec&#39;vc.28" expl="precondition" proved="true">
-  <proof prover="2"><result status="valid" time="0.544459" steps="77251"/></proof>
+  <proof prover="2"><result status="valid" time="0.393080" steps="81327"/></proof>
   </goal>
   <goal name="delete_max_rec&#39;vc.29" expl="precondition" proved="true">
   <transf name="split_vc" proved="true" >
    <goal name="delete_max_rec&#39;vc.29.0" expl="precondition" proved="true">
-   <transf name="split_vc" proved="true" >
-    <goal name="delete_max_rec&#39;vc.29.0.0" expl="precondition" proved="true">
-    <proof prover="2"><result status="valid" time="0.238314" steps="19658"/></proof>
-    </goal>
-    <goal name="delete_max_rec&#39;vc.29.0.1" expl="precondition" proved="true">
-    <proof prover="0" timelimit="5"><result status="valid" time="0.070128" steps="18265"/></proof>
-    </goal>
-   </transf>
+   <proof prover="2"><result status="valid" time="0.090728" steps="23102"/></proof>
    </goal>
    <goal name="delete_max_rec&#39;vc.29.1" expl="precondition" proved="true">
-   <proof prover="2"><result status="valid" time="1.032732" steps="98579"/></proof>
+   <proof prover="2"><result status="valid" time="0.751833" steps="99963"/></proof>
    </goal>
   </transf>
   </goal>
   <goal name="delete_max_rec&#39;vc.30" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.026831" steps="38"/></proof>
+  <proof prover="2"><result status="valid" time="0.098341" steps="29494"/></proof>
   </goal>
   <goal name="delete_max_rec&#39;vc.31" expl="precondition" proved="true">
-  <transf name="split_vc" proved="true" >
-   <goal name="delete_max_rec&#39;vc.31.0" expl="precondition" proved="true">
-   <transf name="split_vc" proved="true" >
-    <goal name="delete_max_rec&#39;vc.31.0.0" expl="precondition" proved="true">
-    <proof prover="2"><result status="valid" time="0.432824" steps="54252"/></proof>
-    </goal>
-    <goal name="delete_max_rec&#39;vc.31.0.1" expl="precondition" proved="true">
-    <proof prover="2"><result status="valid" time="0.035613" steps="9283"/></proof>
-    </goal>
-   </transf>
-   </goal>
-   <goal name="delete_max_rec&#39;vc.31.1" expl="precondition" proved="true">
-   <proof prover="0" timelimit="5"><result status="valid" time="0.534432" steps="85669"/></proof>
-   </goal>
-  </transf>
+  <proof prover="2"><result status="valid" time="0.946480" steps="137903"/></proof>
   </goal>
   <goal name="delete_max_rec&#39;vc.32" expl="precondition" proved="true">
-  <transf name="split_vc" proved="true" >
-   <goal name="delete_max_rec&#39;vc.32.0" expl="precondition" proved="true">
-   <proof prover="2"><result status="valid" time="0.185138" steps="26469"/></proof>
-   </goal>
-   <goal name="delete_max_rec&#39;vc.32.1" expl="precondition" proved="true">
-   <proof prover="2"><result status="valid" time="0.375055" steps="81355"/></proof>
-   </goal>
-  </transf>
+  <proof prover="2"><result status="valid" time="0.508781" steps="89305"/></proof>
   </goal>
   <goal name="delete_max_rec&#39;vc.33" expl="precondition" proved="true">
-  <transf name="split_vc" proved="true" >
-   <goal name="delete_max_rec&#39;vc.33.0" expl="precondition" proved="true">
-   <proof prover="2"><result status="valid" time="0.056400" steps="14326"/></proof>
-   </goal>
-   <goal name="delete_max_rec&#39;vc.33.1" expl="precondition" proved="true">
-   <proof prover="1"><result status="valid" time="0.029057" steps="74"/></proof>
-   </goal>
-  </transf>
+  <proof prover="2"><result status="valid" time="0.070884" steps="30892"/></proof>
   </goal>
   <goal name="delete_max_rec&#39;vc.34" expl="precondition" proved="true">
-  <transf name="split_vc" proved="true" >
-   <goal name="delete_max_rec&#39;vc.34.0" expl="precondition" proved="true">
-   <proof prover="2"><result status="valid" time="0.182807" steps="26576"/></proof>
-   </goal>
-   <goal name="delete_max_rec&#39;vc.34.1" expl="precondition" proved="true">
-   <proof prover="1"><result status="valid" time="0.895027" steps="9345"/></proof>
-   </goal>
-  </transf>
+  <proof prover="2"><result status="valid" time="0.508286" steps="89687"/></proof>
   </goal>
   <goal name="delete_max_rec&#39;vc.35" expl="precondition" proved="true">
-  <proof prover="2"><result status="valid" time="0.042651" steps="30023"/></proof>
+  <proof prover="2"><result status="valid" time="0.065724" steps="29919"/></proof>
   </goal>
   <goal name="delete_max_rec&#39;vc.36" expl="type invariant" proved="true">
-  <proof prover="1"><result status="valid" time="0.032335" steps="73"/></proof>
+  <proof prover="2"><result status="valid" time="0.065325" steps="29976"/></proof>
   </goal>
   <goal name="delete_max_rec&#39;vc.37" expl="type invariant" proved="true">
-  <proof prover="6"><result status="valid" time="0.025993" steps="94154"/></proof>
+  <proof prover="2"><result status="valid" time="0.052839" steps="29987"/></proof>
   </goal>
   <goal name="delete_max_rec&#39;vc.38" expl="postcondition" proved="true">
   <transf name="split_vc" proved="true" >
    <goal name="delete_max_rec&#39;vc.38.0" expl="postcondition" proved="true">
-   <proof prover="6"><result status="valid" time="0.059976" steps="102878"/></proof>
+   <proof prover="2"><result status="valid" time="0.071118" steps="17275"/></proof>
    </goal>
    <goal name="delete_max_rec&#39;vc.38.1" expl="postcondition" proved="true">
    <transf name="split_vc" proved="true" >
     <goal name="delete_max_rec&#39;vc.38.1.0" expl="postcondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="delete_max_rec&#39;vc.38.1.0.0" expl="postcondition" proved="true">
-     <proof prover="2"><result status="valid" time="0.529897" steps="71216"/></proof>
-     </goal>
-     <goal name="delete_max_rec&#39;vc.38.1.0.1" expl="postcondition" proved="true">
-     <proof prover="6"><result status="valid" time="0.082713" steps="27432"/></proof>
-     </goal>
-    </transf>
+    <proof prover="6"><result status="valid" time="0.325141" steps="924186"/></proof>
     </goal>
     <goal name="delete_max_rec&#39;vc.38.1.1" expl="postcondition" proved="true">
-    <proof prover="2"><result status="valid" time="0.221134" steps="55579"/></proof>
+    <proof prover="2"><result status="valid" time="0.326208" steps="55579"/></proof>
     </goal>
    </transf>
    </goal>
@@ -2001,64 +979,25 @@
   <goal name="delete_max_rec&#39;vc.39" expl="postcondition" proved="true">
   <transf name="split_vc" proved="true" >
    <goal name="delete_max_rec&#39;vc.39.0" expl="postcondition" proved="true">
-   <transf name="split_vc" proved="true" >
-    <goal name="delete_max_rec&#39;vc.39.0.0" expl="postcondition" proved="true">
-    <proof prover="6"><result status="valid" time="0.077905" steps="147800"/></proof>
-    </goal>
-    <goal name="delete_max_rec&#39;vc.39.0.1" expl="postcondition" proved="true">
-    <proof prover="2"><result status="valid" time="0.025364" steps="7961"/></proof>
-    </goal>
-   </transf>
+   <proof prover="2"><result status="valid" time="0.270749" steps="41595"/></proof>
    </goal>
    <goal name="delete_max_rec&#39;vc.39.1" expl="postcondition" proved="true">
-   <transf name="split_vc" proved="true" >
-    <goal name="delete_max_rec&#39;vc.39.1.0" expl="postcondition" proved="true">
-    <proof prover="2"><result status="valid" time="0.297774" steps="48053"/></proof>
-    </goal>
-    <goal name="delete_max_rec&#39;vc.39.1.1" expl="postcondition" proved="true">
-    <proof prover="6"><result status="valid" time="0.742463" steps="2047971"/></proof>
-    </goal>
-   </transf>
+   <proof prover="2"><result status="valid" time="0.782076" steps="108664"/></proof>
    </goal>
   </transf>
   </goal>
   <goal name="delete_max_rec&#39;vc.40" expl="postcondition" proved="true">
   <transf name="split_vc" proved="true" >
    <goal name="delete_max_rec&#39;vc.40.0" expl="postcondition" proved="true">
-   <transf name="split_vc" proved="true" >
-    <goal name="delete_max_rec&#39;vc.40.0.0" expl="postcondition" proved="true">
-    <proof prover="2"><result status="valid" time="0.110159" steps="16427"/></proof>
-    </goal>
-    <goal name="delete_max_rec&#39;vc.40.0.1" expl="postcondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="delete_max_rec&#39;vc.40.0.1.0" expl="postcondition" proved="true">
-     <proof prover="2"><result status="valid" time="0.044073" steps="8322"/></proof>
-     </goal>
-    </transf>
-    </goal>
-   </transf>
+   <proof prover="2"><result status="valid" time="0.364093" steps="60121"/></proof>
    </goal>
    <goal name="delete_max_rec&#39;vc.40.1" expl="postcondition" proved="true">
    <transf name="split_vc" proved="true" >
     <goal name="delete_max_rec&#39;vc.40.1.0" expl="postcondition" proved="true">
-    <proof prover="2"><result status="valid" time="0.710209" steps="76574"/></proof>
+    <proof prover="2"><result status="valid" time="0.555442" steps="78799"/></proof>
     </goal>
     <goal name="delete_max_rec&#39;vc.40.1.1" expl="postcondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="delete_max_rec&#39;vc.40.1.1.0" expl="postcondition" proved="true">
-     <transf name="split_vc" proved="true" >
-      <goal name="delete_max_rec&#39;vc.40.1.1.0.0" expl="postcondition" proved="true">
-      <proof prover="2" timelimit="5"><result status="valid" time="0.107409" steps="19596"/></proof>
-      </goal>
-      <goal name="delete_max_rec&#39;vc.40.1.1.0.1" expl="postcondition" proved="true">
-      <proof prover="2" timelimit="5"><result status="valid" time="0.014984" steps="19009"/></proof>
-      </goal>
-     </transf>
-     </goal>
-     <goal name="delete_max_rec&#39;vc.40.1.1.1" expl="postcondition" proved="true">
-     <proof prover="2" timelimit="5"><result status="valid" time="0.209995" steps="26692"/></proof>
-     </goal>
-    </transf>
+    <proof prover="2"><result status="valid" time="0.554194" steps="82677"/></proof>
     </goal>
    </transf>
    </goal>
@@ -2067,115 +1006,48 @@
   <goal name="delete_max_rec&#39;vc.41" expl="postcondition" proved="true">
   <transf name="split_vc" proved="true" >
    <goal name="delete_max_rec&#39;vc.41.0" expl="postcondition" proved="true">
-   <transf name="split_vc" proved="true" >
-    <goal name="delete_max_rec&#39;vc.41.0.0" expl="postcondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="delete_max_rec&#39;vc.41.0.0.0" expl="postcondition" proved="true">
-     <transf name="split_vc" proved="true" >
-      <goal name="delete_max_rec&#39;vc.41.0.0.0.0" expl="postcondition" proved="true">
-      <proof prover="2"><result status="valid" time="0.057517" steps="18164"/></proof>
-      </goal>
-     </transf>
-     </goal>
-    </transf>
-    </goal>
-    <goal name="delete_max_rec&#39;vc.41.0.1" expl="postcondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="delete_max_rec&#39;vc.41.0.1.0" expl="postcondition" proved="true">
-     <proof prover="2"><result status="valid" time="0.016170" steps="8360"/></proof>
-     </goal>
-    </transf>
-    </goal>
-   </transf>
+   <proof prover="2"><result status="valid" time="0.410679" steps="65318"/></proof>
    </goal>
    <goal name="delete_max_rec&#39;vc.41.1" expl="postcondition" proved="true">
    <transf name="split_vc" proved="true" >
     <goal name="delete_max_rec&#39;vc.41.1.0" expl="postcondition" proved="true">
     <transf name="split_vc" proved="true" >
      <goal name="delete_max_rec&#39;vc.41.1.0.0" expl="postcondition" proved="true">
-     <proof prover="2" timelimit="5"><result status="valid" time="0.800305" steps="89372"/></proof>
+     <proof prover="2"><result status="valid" time="0.661361" steps="89372"/></proof>
      </goal>
      <goal name="delete_max_rec&#39;vc.41.1.0.1" expl="postcondition" proved="true">
-     <proof prover="0" timelimit="5"><result status="valid" time="0.113191" steps="20219"/></proof>
+     <proof prover="2"><result status="valid" time="0.024854" steps="9530"/></proof>
      </goal>
     </transf>
     </goal>
     <goal name="delete_max_rec&#39;vc.41.1.1" expl="postcondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="delete_max_rec&#39;vc.41.1.1.0" expl="postcondition" proved="true">
-     <proof prover="2" timelimit="5"><result status="valid" time="0.547906" steps="53246"/></proof>
-     </goal>
-     <goal name="delete_max_rec&#39;vc.41.1.1.1" expl="postcondition" proved="true">
-     <proof prover="2" timelimit="5"><result status="valid" time="0.690047" steps="91905"/></proof>
-     </goal>
-    </transf>
+    <proof prover="0"><result status="valid" time="0.914954" steps="397293"/></proof>
     </goal>
    </transf>
    </goal>
   </transf>
   </goal>
   <goal name="delete_max_rec&#39;vc.42" expl="postcondition" proved="true">
-  <transf name="split_vc" proved="true" >
-   <goal name="delete_max_rec&#39;vc.42.0" expl="postcondition" proved="true">
-   <transf name="split_vc" proved="true" >
-    <goal name="delete_max_rec&#39;vc.42.0.0" expl="postcondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="delete_max_rec&#39;vc.42.0.0.0" expl="postcondition" proved="true">
-     <transf name="split_vc" proved="true" >
-      <goal name="delete_max_rec&#39;vc.42.0.0.0.0" expl="postcondition" proved="true">
-      <transf name="split_vc" proved="true" >
-       <goal name="delete_max_rec&#39;vc.42.0.0.0.0.0" expl="postcondition" proved="true">
-       <transf name="split_vc" proved="true" >
-        <goal name="delete_max_rec&#39;vc.42.0.0.0.0.0.0" expl="postcondition" proved="true">
-        <proof prover="2" timelimit="5" memlimit="2000"><result status="valid" time="0.026015" steps="10406"/></proof>
-        </goal>
-       </transf>
-       </goal>
-      </transf>
-      </goal>
-     </transf>
-     </goal>
-     <goal name="delete_max_rec&#39;vc.42.0.0.1" expl="postcondition" proved="true">
-     <transf name="split_vc" proved="true" >
-      <goal name="delete_max_rec&#39;vc.42.0.0.1.0" expl="postcondition" proved="true">
-      <proof prover="2"><result status="valid" time="0.020303" steps="8446"/></proof>
-      </goal>
-     </transf>
-     </goal>
-    </transf>
+  <transf name="split_vc" proved="true" >
+   <goal name="delete_max_rec&#39;vc.42.0" expl="postcondition" proved="true">
+   <transf name="split_vc" proved="true" >
+    <goal name="delete_max_rec&#39;vc.42.0.0" expl="postcondition" proved="true">
+    <proof prover="2"><result status="valid" time="0.067587" steps="17834"/></proof>
     </goal>
     <goal name="delete_max_rec&#39;vc.42.0.1" expl="postcondition" proved="true">
     <transf name="split_vc" proved="true" >
      <goal name="delete_max_rec&#39;vc.42.0.1.0" expl="postcondition" proved="true">
      <transf name="split_vc" proved="true" >
       <goal name="delete_max_rec&#39;vc.42.0.1.0.0" expl="postcondition" proved="true">
-      <transf name="split_vc" proved="true" >
-       <goal name="delete_max_rec&#39;vc.42.0.1.0.0.0" expl="postcondition" proved="true">
-       <proof prover="2"><result status="valid" time="0.940656" steps="110496"/></proof>
-       </goal>
-      </transf>
+      <proof prover="2"><result status="valid" time="0.769292" steps="110782"/></proof>
       </goal>
       <goal name="delete_max_rec&#39;vc.42.0.1.0.1" expl="postcondition" proved="true">
-      <proof prover="1"><result status="valid" time="0.039669" steps="261"/></proof>
+      <proof prover="2"><result status="valid" time="0.024888" steps="9607"/></proof>
       </goal>
      </transf>
      </goal>
      <goal name="delete_max_rec&#39;vc.42.0.1.1" expl="postcondition" proved="true">
-     <transf name="split_vc" proved="true" >
-      <goal name="delete_max_rec&#39;vc.42.0.1.1.0" expl="postcondition" proved="true">
-      <transf name="split_vc" proved="true" >
-       <goal name="delete_max_rec&#39;vc.42.0.1.1.0.0" expl="postcondition" proved="true">
-       <proof prover="0" timelimit="5"><result status="valid" time="0.373543" steps="58583"/></proof>
-       </goal>
-       <goal name="delete_max_rec&#39;vc.42.0.1.1.0.1" expl="postcondition" proved="true">
-       <proof prover="0"><result status="valid" time="0.159796" steps="25058"/></proof>
-       </goal>
-      </transf>
-      </goal>
-      <goal name="delete_max_rec&#39;vc.42.0.1.1.1" expl="postcondition" proved="true">
-      <proof prover="2"><result status="valid" time="0.462115" steps="56617"/></proof>
-      </goal>
-     </transf>
+     <proof prover="0"><result status="valid" time="0.953664" steps="391034"/></proof>
      </goal>
     </transf>
     </goal>
@@ -2184,40 +1056,15 @@
    <goal name="delete_max_rec&#39;vc.42.1" expl="postcondition" proved="true">
    <transf name="split_vc" proved="true" >
     <goal name="delete_max_rec&#39;vc.42.1.0" expl="postcondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="delete_max_rec&#39;vc.42.1.0.0" expl="postcondition" proved="true">
-     <transf name="split_vc" proved="true" >
-      <goal name="delete_max_rec&#39;vc.42.1.0.0.0" expl="postcondition" proved="true">
-      <proof prover="2"><result status="valid" time="0.026012" steps="10409"/></proof>
-      </goal>
-     </transf>
-     </goal>
-     <goal name="delete_max_rec&#39;vc.42.1.0.1" expl="postcondition" proved="true">
-     <proof prover="2"><result status="valid" time="0.018191" steps="8054"/></proof>
-     </goal>
-    </transf>
+    <proof prover="2"><result status="valid" time="0.072099" steps="17823"/></proof>
     </goal>
     <goal name="delete_max_rec&#39;vc.42.1.1" expl="postcondition" proved="true">
     <transf name="split_vc" proved="true" >
      <goal name="delete_max_rec&#39;vc.42.1.1.0" expl="postcondition" proved="true">
-     <proof prover="6"><result status="valid" time="0.706348" steps="2064553"/></proof>
+     <proof prover="6"><result status="valid" time="0.942567" steps="2064553"/></proof>
      </goal>
      <goal name="delete_max_rec&#39;vc.42.1.1.1" expl="postcondition" proved="true">
-     <transf name="split_vc" proved="true" >
-      <goal name="delete_max_rec&#39;vc.42.1.1.1.0" expl="postcondition" proved="true">
-      <transf name="split_vc" proved="true" >
-       <goal name="delete_max_rec&#39;vc.42.1.1.1.0.0" expl="postcondition" proved="true">
-       <proof prover="0"><result status="valid" time="0.240689" steps="37788"/></proof>
-       </goal>
-       <goal name="delete_max_rec&#39;vc.42.1.1.1.0.1" expl="postcondition" proved="true">
-       <proof prover="0"><result status="valid" time="0.169322" steps="25925"/></proof>
-       </goal>
-      </transf>
-      </goal>
-      <goal name="delete_max_rec&#39;vc.42.1.1.1.1" expl="postcondition" proved="true">
-      <proof prover="2"><result status="valid" time="0.406975" steps="55447"/></proof>
-      </goal>
-     </transf>
+     <proof prover="2"><result status="valid" time="0.661591" steps="92223"/></proof>
      </goal>
     </transf>
     </goal>
@@ -2226,33 +1073,22 @@
    <goal name="delete_max_rec&#39;vc.42.2" expl="postcondition" proved="true">
    <transf name="split_vc" proved="true" >
     <goal name="delete_max_rec&#39;vc.42.2.0" expl="postcondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="delete_max_rec&#39;vc.42.2.0.0" expl="postcondition" proved="true">
-     <transf name="split_vc" proved="true" >
-      <goal name="delete_max_rec&#39;vc.42.2.0.0.0" expl="postcondition" proved="true">
-      <proof prover="1" timelimit="5"><result status="valid" time="0.523165" steps="6460"/></proof>
-      </goal>
-     </transf>
-     </goal>
-     <goal name="delete_max_rec&#39;vc.42.2.0.1" expl="postcondition" proved="true">
-     <proof prover="2"><result status="valid" time="0.035199" steps="8062"/></proof>
-     </goal>
-    </transf>
+    <proof prover="1"><result status="valid" time="0.874143" steps="12700"/></proof>
     </goal>
     <goal name="delete_max_rec&#39;vc.42.2.1" expl="postcondition" proved="true">
     <transf name="split_vc" proved="true" >
      <goal name="delete_max_rec&#39;vc.42.2.1.0" expl="postcondition" proved="true">
      <transf name="split_vc" proved="true" >
       <goal name="delete_max_rec&#39;vc.42.2.1.0.0" expl="postcondition" proved="true">
-      <proof prover="2"><result status="valid" time="0.754644" steps="82331"/></proof>
+      <proof prover="2"><result status="valid" time="0.485589" steps="82292"/></proof>
       </goal>
       <goal name="delete_max_rec&#39;vc.42.2.1.0.1" expl="postcondition" proved="true">
-      <proof prover="2"><result status="valid" time="0.038961" steps="9609"/></proof>
+      <proof prover="2"><result status="valid" time="0.025465" steps="9609"/></proof>
       </goal>
      </transf>
      </goal>
      <goal name="delete_max_rec&#39;vc.42.2.1.1" expl="postcondition" proved="true">
-     <proof prover="2" timelimit="5"><result status="valid" time="0.732918" steps="89286"/></proof>
+     <proof prover="2"><result status="valid" time="0.593970" steps="89284"/></proof>
      </goal>
     </transf>
     </goal>
@@ -2263,29 +1099,15 @@
   <goal name="delete_max_rec&#39;vc.43" expl="postcondition" proved="true">
   <transf name="split_vc" proved="true" >
    <goal name="delete_max_rec&#39;vc.43.0" expl="postcondition" proved="true">
-   <transf name="split_vc" proved="true" >
-    <goal name="delete_max_rec&#39;vc.43.0.0" expl="postcondition" proved="true">
-    <proof prover="2"><result status="valid" time="0.063183" steps="12011"/></proof>
-    </goal>
-    <goal name="delete_max_rec&#39;vc.43.0.1" expl="postcondition" proved="true">
-    <proof prover="2"><result status="valid" time="0.033495" steps="8097"/></proof>
-    </goal>
-   </transf>
+   <proof prover="2"><result status="valid" time="0.065387" steps="17201"/></proof>
    </goal>
    <goal name="delete_max_rec&#39;vc.43.1" expl="postcondition" proved="true">
    <transf name="split_vc" proved="true" >
     <goal name="delete_max_rec&#39;vc.43.1.0" expl="postcondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="delete_max_rec&#39;vc.43.1.0.0" expl="postcondition" proved="true">
-     <proof prover="0" timelimit="5"><result status="valid" time="1.717451" steps="574755"/></proof>
-     </goal>
-     <goal name="delete_max_rec&#39;vc.43.1.0.1" expl="postcondition" proved="true">
-     <proof prover="2"><result status="valid" time="0.032363" steps="9669"/></proof>
-     </goal>
-    </transf>
+    <proof prover="2"><result status="valid" time="0.315222" steps="53174"/></proof>
     </goal>
     <goal name="delete_max_rec&#39;vc.43.1.1" expl="postcondition" proved="true">
-    <proof prover="2"><result status="valid" time="0.654605" steps="89827"/></proof>
+    <proof prover="2"><result status="valid" time="0.696267" steps="89830"/></proof>
     </goal>
    </transf>
    </goal>
@@ -2294,29 +1116,22 @@
   <goal name="delete_max_rec&#39;vc.44" expl="postcondition" proved="true">
   <transf name="split_vc" proved="true" >
    <goal name="delete_max_rec&#39;vc.44.0" expl="postcondition" proved="true">
-   <transf name="split_vc" proved="true" >
-    <goal name="delete_max_rec&#39;vc.44.0.0" expl="postcondition" proved="true">
-    <proof prover="2"><result status="valid" time="0.099730" steps="16356"/></proof>
-    </goal>
-    <goal name="delete_max_rec&#39;vc.44.0.1" expl="postcondition" proved="true">
-    <proof prover="2"><result status="valid" time="0.037464" steps="8125"/></proof>
-    </goal>
-   </transf>
+   <proof prover="2"><result status="valid" time="0.184330" steps="36677"/></proof>
    </goal>
    <goal name="delete_max_rec&#39;vc.44.1" expl="postcondition" proved="true">
    <transf name="split_vc" proved="true" >
     <goal name="delete_max_rec&#39;vc.44.1.0" expl="postcondition" proved="true">
-    <proof prover="0" timelimit="5"><result status="valid" time="0.313187" steps="55169"/></proof>
+    <proof prover="2"><result status="valid" time="0.288557" steps="48362"/></proof>
     </goal>
     <goal name="delete_max_rec&#39;vc.44.1.1" expl="postcondition" proved="true">
-    <proof prover="2"><result status="valid" time="0.623540" steps="75842"/></proof>
+    <proof prover="2"><result status="valid" time="0.551597" steps="75648"/></proof>
     </goal>
    </transf>
    </goal>
   </transf>
   </goal>
   <goal name="delete_max_rec&#39;vc.45" expl="postcondition" proved="true">
-  <proof prover="6"><result status="valid" time="0.035413" steps="94399"/></proof>
+  <proof prover="2"><result status="valid" time="0.085445" steps="44051"/></proof>
   </goal>
  </transf>
  </goal>
@@ -2325,105 +1140,90 @@
  <goal name="delete_max&#39;vc" expl="VC for delete_max" proved="true">
  <transf name="split_vc" proved="true" >
   <goal name="delete_max&#39;vc.0" expl="type invariant" proved="true">
-  <proof prover="1"><result status="valid" time="0.018181" steps="26"/></proof>
+  <proof prover="2"><result status="valid" time="0.029859" steps="8728"/></proof>
   </goal>
   <goal name="delete_max&#39;vc.1" expl="precondition" proved="true">
-  <proof prover="6"><result status="valid" time="0.021546" steps="56484"/></proof>
+  <proof prover="2"><result status="valid" time="0.024187" steps="8569"/></proof>
   </goal>
   <goal name="delete_max&#39;vc.2" expl="type invariant" proved="true">
-  <proof prover="1"><result status="valid" time="0.022108" steps="60"/></proof>
+  <proof prover="2"><result status="valid" time="0.030920" steps="8604"/></proof>
   </goal>
   <goal name="delete_max&#39;vc.3" expl="type invariant" proved="true">
-  <proof prover="1"><result status="valid" time="0.020751" steps="64"/></proof>
+  <proof prover="2"><result status="valid" time="0.027422" steps="8699"/></proof>
   </goal>
   <goal name="delete_max&#39;vc.4" expl="type invariant" proved="true">
-  <proof prover="6"><result status="valid" time="0.024939" steps="58839"/></proof>
+  <proof prover="2"><result status="valid" time="0.021376" steps="8608"/></proof>
   </goal>
   <goal name="delete_max&#39;vc.5" expl="type invariant" proved="true">
-  <proof prover="6"><result status="valid" time="0.026838" steps="59832"/></proof>
+  <proof prover="2"><result status="valid" time="0.030915" steps="8702"/></proof>
   </goal>
   <goal name="delete_max&#39;vc.6" expl="unreachable point" proved="true">
-  <proof prover="1"><result status="valid" time="0.016523" steps="45"/></proof>
+  <proof prover="2"><result status="valid" time="0.019191" steps="8224"/></proof>
   </goal>
   <goal name="delete_max&#39;vc.7" expl="type invariant" proved="true">
-  <proof prover="2"><result status="valid" time="0.039981" steps="8463"/></proof>
+  <proof prover="2"><result status="valid" time="0.026397" steps="8463"/></proof>
   </goal>
   <goal name="delete_max&#39;vc.8" expl="type invariant" proved="true">
-  <proof prover="1"><result status="valid" time="0.025916" steps="46"/></proof>
+  <proof prover="2"><result status="valid" time="0.027249" steps="8832"/></proof>
   </goal>
   <goal name="delete_max&#39;vc.9" expl="assertion" proved="true">
-  <proof prover="2"><result status="valid" time="0.127202" steps="18616"/></proof>
+  <proof prover="2"><result status="valid" time="0.080178" steps="18616"/></proof>
   </goal>
   <goal name="delete_max&#39;vc.10" expl="precondition" proved="true">
-  <proof prover="2"><result status="valid" time="0.111564" steps="17190"/></proof>
+  <proof prover="2"><result status="valid" time="0.069001" steps="17190"/></proof>
   </goal>
   <goal name="delete_max&#39;vc.11" expl="precondition" proved="true">
-  <proof prover="2"><result status="valid" time="0.166850" steps="21478"/></proof>
+  <proof prover="2"><result status="valid" time="0.101236" steps="21478"/></proof>
   </goal>
   <goal name="delete_max&#39;vc.12" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.020016" steps="43"/></proof>
+  <proof prover="2"><result status="valid" time="0.034179" steps="9555"/></proof>
   </goal>
   <goal name="delete_max&#39;vc.13" expl="precondition" proved="true">
-  <proof prover="6"><result status="valid" time="0.023703" steps="51383"/></proof>
+  <proof prover="2"><result status="valid" time="0.029798" steps="9236"/></proof>
   </goal>
   <goal name="delete_max&#39;vc.14" expl="type invariant" proved="true">
-  <proof prover="1"><result status="valid" time="0.023817" steps="55"/></proof>
+  <proof prover="2"><result status="valid" time="0.024382" steps="9343"/></proof>
   </goal>
   <goal name="delete_max&#39;vc.15" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.023751" steps="67"/></proof>
+  <proof prover="2"><result status="valid" time="0.034460" steps="9516"/></proof>
   </goal>
   <goal name="delete_max&#39;vc.16" expl="precondition" proved="true">
-  <proof prover="2"><result status="valid" time="0.081002" steps="14108"/></proof>
+  <proof prover="2"><result status="valid" time="0.057508" steps="14108"/></proof>
   </goal>
   <goal name="delete_max&#39;vc.17" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.020646" steps="72"/></proof>
+  <proof prover="2"><result status="valid" time="0.020004" steps="8303"/></proof>
   </goal>
   <goal name="delete_max&#39;vc.18" expl="type invariant" proved="true">
-  <proof prover="1"><result status="valid" time="0.029501" steps="79"/></proof>
+  <proof prover="2"><result status="valid" time="0.029429" steps="10216"/></proof>
   </goal>
   <goal name="delete_max&#39;vc.19" expl="type invariant" proved="true">
-  <proof prover="1"><result status="valid" time="0.031817" steps="83"/></proof>
+  <proof prover="2"><result status="valid" time="0.032641" steps="10258"/></proof>
   </goal>
   <goal name="delete_max&#39;vc.20" expl="postcondition" proved="true">
-  <proof prover="2"><result status="valid" time="0.391129" steps="56920"/></proof>
+  <proof prover="2"><result status="valid" time="0.281648" steps="56492"/></proof>
   </goal>
   <goal name="delete_max&#39;vc.21" expl="postcondition" proved="true">
   <transf name="split_vc" proved="true" >
    <goal name="delete_max&#39;vc.21.0" expl="postcondition" proved="true">
-   <proof prover="1"><result status="valid" time="0.072076" steps="881"/></proof>
+   <proof prover="2"><result status="valid" time="0.167741" steps="38994"/></proof>
    </goal>
    <goal name="delete_max&#39;vc.21.1" expl="postcondition" proved="true">
-   <proof prover="1"><result status="valid" time="0.097252" steps="1075"/></proof>
+   <proof prover="2"><result status="valid" time="0.327405" steps="52978"/></proof>
    </goal>
    <goal name="delete_max&#39;vc.21.2" expl="postcondition" proved="true">
    <transf name="split_vc" proved="true" >
     <goal name="delete_max&#39;vc.21.2.0" expl="postcondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="delete_max&#39;vc.21.2.0.0" expl="postcondition" proved="true">
-     <proof prover="1"><result status="valid" time="0.016986" steps="54"/></proof>
-     </goal>
-    </transf>
+    <proof prover="2"><result status="valid" time="0.042300" steps="9495"/></proof>
     </goal>
     <goal name="delete_max&#39;vc.21.2.1" expl="postcondition" proved="true">
     <transf name="split_vc" proved="true" >
      <goal name="delete_max&#39;vc.21.2.1.0" expl="postcondition" proved="true">
-     <proof prover="1"><result status="valid" time="0.153795" steps="1806"/></proof>
+     <proof prover="2"><result status="valid" time="0.902561" steps="141862"/></proof>
      </goal>
      <goal name="delete_max&#39;vc.21.2.1.1" expl="postcondition" proved="true">
      <transf name="split_vc" proved="true" >
       <goal name="delete_max&#39;vc.21.2.1.1.0" expl="postcondition" proved="true">
-      <transf name="split_vc" proved="true" >
-       <goal name="delete_max&#39;vc.21.2.1.1.0.0" expl="postcondition" proved="true">
-       <transf name="split_vc" proved="true" >
-        <goal name="delete_max&#39;vc.21.2.1.1.0.0.0" expl="postcondition" proved="true">
-        <proof prover="0" timelimit="5"><result status="valid" time="0.421254" steps="62388"/></proof>
-        </goal>
-        <goal name="delete_max&#39;vc.21.2.1.1.0.0.1" expl="postcondition" proved="true">
-        <proof prover="1"><result status="valid" time="0.035446" steps="216"/></proof>
-        </goal>
-       </transf>
-       </goal>
-      </transf>
+      <proof prover="0"><result status="valid" time="0.337815" steps="73896"/></proof>
       </goal>
      </transf>
      </goal>
@@ -2432,15 +1232,15 @@
    </transf>
    </goal>
    <goal name="delete_max&#39;vc.21.3" expl="postcondition" proved="true">
-   <proof prover="1"><result status="valid" time="0.049787" steps="472"/></proof>
+   <proof prover="2"><result status="valid" time="0.048254" steps="19010"/></proof>
    </goal>
    <goal name="delete_max&#39;vc.21.4" expl="postcondition" proved="true">
-   <proof prover="1"><result status="valid" time="0.052806" steps="391"/></proof>
+   <proof prover="2"><result status="valid" time="0.069675" steps="19685"/></proof>
    </goal>
   </transf>
   </goal>
   <goal name="delete_max&#39;vc.22" expl="postcondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.021222" steps="28"/></proof>
+  <proof prover="2"><result status="valid" time="0.041975" steps="18001"/></proof>
   </goal>
  </transf>
  </goal>
@@ -2449,240 +1249,164 @@
  <goal name="delete_min_rec&#39;vc" expl="VC for delete_min_rec" proved="true">
  <transf name="split_vc" proved="true" >
   <goal name="delete_min_rec&#39;vc.0" expl="precondition" proved="true">
-  <proof prover="2"><result status="valid" time="0.038350" steps="7927"/></proof>
+  <proof prover="2"><result status="valid" time="0.026098" steps="7927"/></proof>
   </goal>
   <goal name="delete_min_rec&#39;vc.1" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.039006" steps="282"/></proof>
+  <proof prover="1"><result status="valid" time="0.028881" steps="233"/></proof>
   </goal>
   <goal name="delete_min_rec&#39;vc.2" expl="precondition" proved="true">
-  <proof prover="6"><result status="valid" time="0.021268" steps="4282"/></proof>
+  <proof prover="2"><result status="valid" time="0.035490" steps="7524"/></proof>
   </goal>
   <goal name="delete_min_rec&#39;vc.3" expl="precondition" proved="true">
-  <proof prover="6"><result status="valid" time="0.023991" steps="52224"/></proof>
+  <proof prover="2"><result status="valid" time="0.028383" steps="8200"/></proof>
   </goal>
   <goal name="delete_min_rec&#39;vc.4" expl="type invariant" proved="true">
-  <proof prover="2"><result status="valid" time="0.041672" steps="8228"/></proof>
+  <proof prover="2"><result status="valid" time="0.034139" steps="8228"/></proof>
   </goal>
   <goal name="delete_min_rec&#39;vc.5" expl="type invariant" proved="true">
-  <proof prover="6"><result status="valid" time="0.025716" steps="4437"/></proof>
+  <proof prover="2"><result status="valid" time="0.019963" steps="7674"/></proof>
   </goal>
   <goal name="delete_min_rec&#39;vc.6" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.020400" steps="81"/></proof>
+  <proof prover="2"><result status="valid" time="0.037805" steps="8695"/></proof>
   </goal>
   <goal name="delete_min_rec&#39;vc.7" expl="type invariant" proved="true">
-  <proof prover="1"><result status="valid" time="0.027027" steps="87"/></proof>
+  <proof prover="2"><result status="valid" time="0.025120" steps="8756"/></proof>
   </goal>
   <goal name="delete_min_rec&#39;vc.8" expl="type invariant" proved="true">
-  <proof prover="2"><result status="valid" time="0.049178" steps="8852"/></proof>
+  <proof prover="2"><result status="valid" time="0.021703" steps="8852"/></proof>
   </goal>
   <goal name="delete_min_rec&#39;vc.9" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.047012" steps="618"/></proof>
+  <proof prover="2"><result status="valid" time="0.023452" steps="9621"/></proof>
   </goal>
   <goal name="delete_min_rec&#39;vc.10" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.017267" steps="92"/></proof>
+  <proof prover="2"><result status="valid" time="0.030921" steps="8467"/></proof>
   </goal>
   <goal name="delete_min_rec&#39;vc.11" expl="type invariant" proved="true">
-  <proof prover="6"><result status="valid" time="0.015128" steps="4714"/></proof>
+  <proof prover="2"><result status="valid" time="0.018596" steps="7938"/></proof>
   </goal>
   <goal name="delete_min_rec&#39;vc.12" expl="precondition" proved="true">
-  <proof prover="2"><result status="valid" time="0.038421" steps="8364"/></proof>
+  <proof prover="2"><result status="valid" time="0.026249" steps="8364"/></proof>
   </goal>
   <goal name="delete_min_rec&#39;vc.13" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.019641" steps="65"/></proof>
+  <proof prover="2"><result status="valid" time="0.028203" steps="8396"/></proof>
   </goal>
   <goal name="delete_min_rec&#39;vc.14" expl="precondition" proved="true">
-  <proof prover="6"><result status="valid" time="0.016176" steps="6508"/></proof>
+  <proof prover="2"><result status="valid" time="0.023846" steps="8235"/></proof>
   </goal>
   <goal name="delete_min_rec&#39;vc.15" expl="precondition" proved="true">
-  <proof prover="6"><result status="valid" time="0.015508" steps="4551"/></proof>
+  <proof prover="2"><result status="valid" time="0.014813" steps="7816"/></proof>
   </goal>
   <goal name="delete_min_rec&#39;vc.16" expl="type invariant" proved="true">
-  <proof prover="1"><result status="valid" time="0.020380" steps="66"/></proof>
+  <proof prover="2"><result status="valid" time="0.017967" steps="7826"/></proof>
   </goal>
   <goal name="delete_min_rec&#39;vc.17" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.024941" steps="75"/></proof>
+  <proof prover="2"><result status="valid" time="0.029272" steps="8667"/></proof>
   </goal>
   <goal name="delete_min_rec&#39;vc.18" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.207388" steps="2624"/></proof>
+  <proof prover="1"><result status="valid" time="0.172882" steps="2676"/></proof>
   </goal>
   <goal name="delete_min_rec&#39;vc.19" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.103057" steps="1335"/></proof>
+  <proof prover="1"><result status="valid" time="0.108916" steps="1391"/></proof>
   </goal>
   <goal name="delete_min_rec&#39;vc.20" expl="precondition" proved="true">
   <transf name="split_vc" proved="true" >
    <goal name="delete_min_rec&#39;vc.20.0" expl="precondition" proved="true">
-   <transf name="compute_hyp" proved="true" >
-    <goal name="delete_min_rec&#39;vc.20.0.0" expl="precondition" proved="true">
-    <proof prover="2"><result status="valid" time="0.221520" steps="51091"/></proof>
-    </goal>
-   </transf>
+   <proof prover="1" timelimit="5" memlimit="2000"><result status="valid" time="1.196543" steps="17326"/></proof>
    </goal>
   </transf>
   </goal>
   <goal name="delete_min_rec&#39;vc.21" expl="precondition" proved="true">
-  <proof prover="2"><result status="valid" time="0.028057" steps="9331"/></proof>
+  <proof prover="2"><result status="valid" time="0.025656" steps="9331"/></proof>
   </goal>
   <goal name="delete_min_rec&#39;vc.22" expl="type invariant" proved="true">
-  <proof prover="1"><result status="valid" time="0.024636" steps="104"/></proof>
+  <proof prover="2"><result status="valid" time="0.031576" steps="9877"/></proof>
   </goal>
   <goal name="delete_min_rec&#39;vc.23" expl="type invariant" proved="true">
-  <proof prover="1"><result status="valid" time="0.028566" steps="110"/></proof>
+  <proof prover="2"><result status="valid" time="0.031937" steps="10019"/></proof>
   </goal>
   <goal name="delete_min_rec&#39;vc.24" expl="precondition" proved="true">
-  <proof prover="2"><result status="valid" time="0.633690" steps="96630"/></proof>
+  <proof prover="2"><result status="valid" time="0.460298" steps="95714"/></proof>
   </goal>
   <goal name="delete_min_rec&#39;vc.25" expl="precondition" proved="true">
   <transf name="split_vc" proved="true" >
    <goal name="delete_min_rec&#39;vc.25.0" expl="precondition" proved="true">
-   <proof prover="2"><result status="valid" time="0.417021" steps="45432"/></proof>
+   <proof prover="2"><result status="valid" time="0.279049" steps="45432"/></proof>
    </goal>
    <goal name="delete_min_rec&#39;vc.25.1" expl="precondition" proved="true">
-   <proof prover="2"><result status="valid" time="0.404983" steps="47603"/></proof>
+   <proof prover="2"><result status="valid" time="0.269270" steps="47603"/></proof>
    </goal>
   </transf>
   </goal>
   <goal name="delete_min_rec&#39;vc.26" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.025411" steps="38"/></proof>
+  <proof prover="2"><result status="valid" time="0.074188" steps="26956"/></proof>
   </goal>
   <goal name="delete_min_rec&#39;vc.27" expl="precondition" proved="true">
-  <transf name="split_vc" proved="true" >
-   <goal name="delete_min_rec&#39;vc.27.0" expl="precondition" proved="true">
-   <transf name="split_vc" proved="true" >
-    <goal name="delete_min_rec&#39;vc.27.0.0" expl="precondition" proved="true">
-    <proof prover="2"><result status="valid" time="0.427678" steps="48752"/></proof>
-    </goal>
-   </transf>
-   </goal>
-   <goal name="delete_min_rec&#39;vc.27.1" expl="precondition" proved="true">
-   <proof prover="2"><result status="valid" time="0.586932" steps="87512"/></proof>
-   </goal>
-  </transf>
+  <proof prover="2"><result status="valid" time="0.546914" steps="88327"/></proof>
   </goal>
   <goal name="delete_min_rec&#39;vc.28" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.025119" steps="64"/></proof>
+  <proof prover="2"><result status="valid" time="0.059547" steps="28300"/></proof>
   </goal>
   <goal name="delete_min_rec&#39;vc.29" expl="precondition" proved="true">
-  <proof prover="2"><result status="valid" time="0.518593" steps="74974"/></proof>
+  <proof prover="2"><result status="valid" time="0.357171" steps="74974"/></proof>
   </goal>
   <goal name="delete_min_rec&#39;vc.30" expl="precondition" proved="true">
-  <proof prover="2"><result status="valid" time="0.449956" steps="74542"/></proof>
+  <proof prover="2"><result status="valid" time="0.375279" steps="77300"/></proof>
   </goal>
   <goal name="delete_min_rec&#39;vc.31" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.029190" steps="57"/></proof>
+  <proof prover="2"><result status="valid" time="0.050893" steps="27376"/></proof>
   </goal>
   <goal name="delete_min_rec&#39;vc.32" expl="type invariant" proved="true">
-  <proof prover="1"><result status="valid" time="0.026601" steps="72"/></proof>
+  <proof prover="2"><result status="valid" time="0.061612" steps="27593"/></proof>
   </goal>
   <goal name="delete_min_rec&#39;vc.33" expl="type invariant" proved="true">
-  <proof prover="1"><result status="valid" time="0.031012" steps="75"/></proof>
+  <proof prover="2"><result status="valid" time="0.054769" steps="27604"/></proof>
   </goal>
   <goal name="delete_min_rec&#39;vc.34" expl="postcondition" proved="true">
   <transf name="split_vc" proved="true" >
    <goal name="delete_min_rec&#39;vc.34.0" expl="postcondition" proved="true">
-   <transf name="split_vc" proved="true" >
-    <goal name="delete_min_rec&#39;vc.34.0.0" expl="postcondition" proved="true">
-    <proof prover="2"><result status="valid" time="0.054878" steps="11769"/></proof>
-    </goal>
-   </transf>
+   <proof prover="2"><result status="valid" time="0.051159" steps="13977"/></proof>
    </goal>
    <goal name="delete_min_rec&#39;vc.34.1" expl="postcondition" proved="true">
-   <transf name="split_vc" proved="true" >
-    <goal name="delete_min_rec&#39;vc.34.1.0" expl="postcondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="delete_min_rec&#39;vc.34.1.0.0" expl="postcondition" proved="true">
-     <proof prover="6"><result status="valid" time="0.278924" steps="877546"/></proof>
-     </goal>
-    </transf>
-    </goal>
-    <goal name="delete_min_rec&#39;vc.34.1.1" expl="postcondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="delete_min_rec&#39;vc.34.1.1.0" expl="postcondition" proved="true">
-     <proof prover="2"><result status="valid" time="0.155256" steps="22688"/></proof>
-     </goal>
-    </transf>
-    </goal>
-   </transf>
+   <proof prover="2"><result status="valid" time="0.690433" steps="138382"/></proof>
    </goal>
   </transf>
   </goal>
   <goal name="delete_min_rec&#39;vc.35" expl="postcondition" proved="true">
   <transf name="split_vc" proved="true" >
    <goal name="delete_min_rec&#39;vc.35.0" expl="postcondition" proved="true">
-   <proof prover="2"><result status="valid" time="0.121911" steps="20576"/></proof>
+   <proof prover="2"><result status="valid" time="0.093598" steps="20576"/></proof>
    </goal>
    <goal name="delete_min_rec&#39;vc.35.1" expl="postcondition" proved="true">
-   <proof prover="2"><result status="valid" time="0.464603" steps="77437"/></proof>
+   <proof prover="2"><result status="valid" time="0.402111" steps="77437"/></proof>
    </goal>
   </transf>
   </goal>
   <goal name="delete_min_rec&#39;vc.36" expl="postcondition" proved="true">
   <transf name="split_vc" proved="true" >
    <goal name="delete_min_rec&#39;vc.36.0" expl="postcondition" proved="true">
-   <transf name="split_vc" proved="true" >
-    <goal name="delete_min_rec&#39;vc.36.0.0" expl="postcondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="delete_min_rec&#39;vc.36.0.0.0" expl="postcondition" proved="true">
-     <proof prover="2"><result status="valid" time="0.081673" steps="13630"/></proof>
-     </goal>
-    </transf>
-    </goal>
-   </transf>
+   <proof prover="2"><result status="valid" time="0.100999" steps="19338"/></proof>
    </goal>
    <goal name="delete_min_rec&#39;vc.36.1" expl="postcondition" proved="true">
-   <transf name="split_vc" proved="true" >
-    <goal name="delete_min_rec&#39;vc.36.1.0" expl="postcondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="delete_min_rec&#39;vc.36.1.0.0" expl="postcondition" proved="true">
-     <proof prover="2"><result status="valid" time="0.096165" steps="29289"/></proof>
-     </goal>
-    </transf>
-    </goal>
-    <goal name="delete_min_rec&#39;vc.36.1.1" expl="postcondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="delete_min_rec&#39;vc.36.1.1.0" expl="postcondition" proved="true">
-     <proof prover="2"><result status="valid" time="0.241716" steps="20785"/></proof>
-     </goal>
-    </transf>
-    </goal>
-   </transf>
+   <proof prover="2"><result status="valid" time="0.482608" steps="80550"/></proof>
    </goal>
   </transf>
   </goal>
   <goal name="delete_min_rec&#39;vc.37" expl="postcondition" proved="true">
   <transf name="split_vc" proved="true" >
    <goal name="delete_min_rec&#39;vc.37.0" expl="postcondition" proved="true">
-   <transf name="split_vc" proved="true" >
-    <goal name="delete_min_rec&#39;vc.37.0.0" expl="postcondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="delete_min_rec&#39;vc.37.0.0.0" expl="postcondition" proved="true">
-     <proof prover="2"><result status="valid" time="0.123998" steps="18411"/></proof>
-     </goal>
-    </transf>
-    </goal>
-   </transf>
+   <proof prover="2"><result status="valid" time="0.136421" steps="28741"/></proof>
    </goal>
    <goal name="delete_min_rec&#39;vc.37.1" expl="postcondition" proved="true">
    <transf name="split_vc" proved="true" >
     <goal name="delete_min_rec&#39;vc.37.1.0" expl="postcondition" proved="true">
     <transf name="split_vc" proved="true" >
      <goal name="delete_min_rec&#39;vc.37.1.0.0" expl="postcondition" proved="true">
-     <proof prover="2"><result status="valid" time="1.200063" steps="128879"/></proof>
+     <proof prover="2"><result status="valid" time="0.657601" steps="112693"/></proof>
      </goal>
     </transf>
     </goal>
     <goal name="delete_min_rec&#39;vc.37.1.1" expl="postcondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="delete_min_rec&#39;vc.37.1.1.0" expl="postcondition" proved="true">
-     <transf name="split_vc" proved="true" >
-      <goal name="delete_min_rec&#39;vc.37.1.1.0.0" expl="postcondition" proved="true">
-      <proof prover="2" timelimit="5" memlimit="2000"><result status="valid" time="0.381436" steps="48639"/></proof>
-      </goal>
-      <goal name="delete_min_rec&#39;vc.37.1.1.0.1" expl="postcondition" proved="true">
-      <proof prover="2"><result status="valid" time="0.305813" steps="41003"/></proof>
-      </goal>
-     </transf>
-     </goal>
-    </transf>
+    <proof prover="0"><result status="valid" time="0.494704" steps="88467"/></proof>
     </goal>
    </transf>
    </goal>
@@ -2693,23 +1417,19 @@
    <goal name="delete_min_rec&#39;vc.38.0" expl="postcondition" proved="true">
    <transf name="split_vc" proved="true" >
     <goal name="delete_min_rec&#39;vc.38.0.0" expl="postcondition" proved="true">
-    <proof prover="6"><result status="valid" time="0.031304" steps="92646"/></proof>
+    <proof prover="2"><result status="valid" time="0.054273" steps="14171"/></proof>
     </goal>
     <goal name="delete_min_rec&#39;vc.38.0.1" expl="postcondition" proved="true">
     <transf name="split_vc" proved="true" >
      <goal name="delete_min_rec&#39;vc.38.0.1.0" expl="postcondition" proved="true">
      <transf name="split_vc" proved="true" >
       <goal name="delete_min_rec&#39;vc.38.0.1.0.0" expl="postcondition" proved="true">
-      <proof prover="0" timelimit="5"><result status="valid" time="2.664738" steps="874566"/></proof>
+      <proof prover="2"><result status="valid" time="0.630911" steps="85571"/></proof>
       </goal>
      </transf>
      </goal>
      <goal name="delete_min_rec&#39;vc.38.0.1.1" expl="postcondition" proved="true">
-     <transf name="split_vc" proved="true" >
-      <goal name="delete_min_rec&#39;vc.38.0.1.1.0" expl="postcondition" proved="true">
-      <proof prover="0" timelimit="5"><result status="valid" time="0.375052" steps="59920"/></proof>
-      </goal>
-     </transf>
+     <proof prover="2"><result status="valid" time="0.722510" steps="96620"/></proof>
      </goal>
     </transf>
     </goal>
@@ -2718,19 +1438,19 @@
    <goal name="delete_min_rec&#39;vc.38.1" expl="postcondition" proved="true">
    <transf name="split_vc" proved="true" >
     <goal name="delete_min_rec&#39;vc.38.1.0" expl="postcondition" proved="true">
-    <proof prover="2"><result status="valid" time="0.066838" steps="14160"/></proof>
+    <proof prover="2"><result status="valid" time="0.056949" steps="14160"/></proof>
     </goal>
     <goal name="delete_min_rec&#39;vc.38.1.1" expl="postcondition" proved="true">
     <transf name="split_vc" proved="true" >
      <goal name="delete_min_rec&#39;vc.38.1.1.0" expl="postcondition" proved="true">
      <transf name="split_vc" proved="true" >
       <goal name="delete_min_rec&#39;vc.38.1.1.0.0" expl="postcondition" proved="true">
-      <proof prover="2"><result status="valid" time="0.412554" steps="49060"/></proof>
+      <proof prover="2"><result status="valid" time="0.284976" steps="49060"/></proof>
       </goal>
      </transf>
      </goal>
      <goal name="delete_min_rec&#39;vc.38.1.1.1" expl="postcondition" proved="true">
-     <proof prover="0" timelimit="5"><result status="valid" time="0.285703" steps="44094"/></proof>
+     <proof prover="2"><result status="valid" time="0.373918" steps="59871"/></proof>
      </goal>
     </transf>
     </goal>
@@ -2741,7 +1461,7 @@
     <goal name="delete_min_rec&#39;vc.38.2.0" expl="postcondition" proved="true">
     <transf name="split_vc" proved="true" >
      <goal name="delete_min_rec&#39;vc.38.2.0.0" expl="postcondition" proved="true">
-     <proof prover="1"><result status="valid" time="0.489675" steps="4666"/></proof>
+     <proof prover="1"><result status="valid" time="0.445080" steps="5041"/></proof>
      </goal>
     </transf>
     </goal>
@@ -2750,16 +1470,12 @@
      <goal name="delete_min_rec&#39;vc.38.2.1.0" expl="postcondition" proved="true">
      <transf name="split_vc" proved="true" >
       <goal name="delete_min_rec&#39;vc.38.2.1.0.0" expl="postcondition" proved="true">
-      <proof prover="2"><result status="valid" time="0.819414" steps="104153"/></proof>
+      <proof prover="2"><result status="valid" time="0.548590" steps="104135"/></proof>
       </goal>
      </transf>
      </goal>
      <goal name="delete_min_rec&#39;vc.38.2.1.1" expl="postcondition" proved="true">
-     <transf name="split_vc" proved="true" >
-      <goal name="delete_min_rec&#39;vc.38.2.1.1.0" expl="postcondition" proved="true">
-      <proof prover="0" timelimit="5"><result status="valid" time="0.236059" steps="35909"/></proof>
-      </goal>
-     </transf>
+     <proof prover="2"><result status="valid" time="0.384471" steps="62482"/></proof>
      </goal>
     </transf>
     </goal>
@@ -2768,13 +1484,27 @@
   </transf>
   </goal>
   <goal name="delete_min_rec&#39;vc.39" expl="postcondition" proved="true">
-  <proof prover="2" timelimit="5" memlimit="2000"><result status="valid" time="3.191460" steps="884235"/></proof>
+  <transf name="split_vc" proved="true" >
+   <goal name="delete_min_rec&#39;vc.39.0" expl="postcondition" proved="true">
+   <proof prover="2"><result status="valid" time="0.052657" steps="14119"/></proof>
+   </goal>
+   <goal name="delete_min_rec&#39;vc.39.1" expl="postcondition" proved="true">
+   <transf name="split_vc" proved="true" >
+    <goal name="delete_min_rec&#39;vc.39.1.0" expl="postcondition" proved="true">
+    <proof prover="2"><result status="valid" time="0.541670" steps="66605"/></proof>
+    </goal>
+    <goal name="delete_min_rec&#39;vc.39.1.1" expl="postcondition" proved="true">
+    <proof prover="2"><result status="valid" time="0.370073" steps="59928"/></proof>
+    </goal>
+   </transf>
+   </goal>
+  </transf>
   </goal>
   <goal name="delete_min_rec&#39;vc.40" expl="postcondition" proved="true">
-  <proof prover="2"><result status="valid" time="0.210386" steps="57004"/></proof>
+  <proof prover="2"><result status="valid" time="0.188652" steps="56903"/></proof>
   </goal>
   <goal name="delete_min_rec&#39;vc.41" expl="postcondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.030096" steps="37"/></proof>
+  <proof prover="2"><result status="valid" time="0.072560" steps="37558"/></proof>
   </goal>
  </transf>
  </goal>
@@ -2783,156 +1513,84 @@
  <goal name="delete_min&#39;vc" expl="VC for delete_min" proved="true">
  <transf name="split_vc" proved="true" >
   <goal name="delete_min&#39;vc.0" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.025607" steps="48"/></proof>
+  <proof prover="2"><result status="valid" time="0.026573" steps="8447"/></proof>
   </goal>
   <goal name="delete_min&#39;vc.1" expl="type invariant" proved="true">
-  <proof prover="1"><result status="valid" time="0.013746" steps="58"/></proof>
+  <proof prover="2"><result status="valid" time="0.030571" steps="8482"/></proof>
   </goal>
   <goal name="delete_min&#39;vc.2" expl="type invariant" proved="true">
-  <proof prover="1"><result status="valid" time="0.020783" steps="62"/></proof>
+  <proof prover="2"><result status="valid" time="0.026989" steps="8577"/></proof>
   </goal>
   <goal name="delete_min&#39;vc.3" expl="type invariant" proved="true">
-  <proof prover="2"><result status="valid" time="0.045194" steps="8486"/></proof>
+  <proof prover="2"><result status="valid" time="0.024971" steps="8486"/></proof>
   </goal>
   <goal name="delete_min&#39;vc.4" expl="type invariant" proved="true">
-  <proof prover="6"><result status="valid" time="0.027274" steps="59294"/></proof>
+  <proof prover="2"><result status="valid" time="0.031303" steps="8580"/></proof>
   </goal>
   <goal name="delete_min&#39;vc.5" expl="unreachable point" proved="true">
-  <proof prover="2"><result status="valid" time="0.042540" steps="8217"/></proof>
+  <proof prover="2"><result status="valid" time="0.040075" steps="8217"/></proof>
   </goal>
   <goal name="delete_min&#39;vc.6" expl="type invariant" proved="true">
-  <proof prover="1"><result status="valid" time="0.011410" steps="38"/></proof>
+  <proof prover="2"><result status="valid" time="0.027661" steps="8341"/></proof>
   </goal>
   <goal name="delete_min&#39;vc.7" expl="type invariant" proved="true">
-  <proof prover="2"><result status="valid" time="0.044931" steps="8710"/></proof>
+  <proof prover="2"><result status="valid" time="0.031278" steps="8710"/></proof>
   </goal>
   <goal name="delete_min&#39;vc.8" expl="precondition" proved="true">
-  <proof prover="2"><result status="valid" time="0.118313" steps="17154"/></proof>
+  <proof prover="2"><result status="valid" time="0.088875" steps="17154"/></proof>
   </goal>
   <goal name="delete_min&#39;vc.9" expl="precondition" proved="true">
-  <proof prover="2"><result status="valid" time="0.158684" steps="21574"/></proof>
+  <proof prover="2"><result status="valid" time="0.095308" steps="21574"/></proof>
   </goal>
   <goal name="delete_min&#39;vc.10" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.024168" steps="39"/></proof>
+  <proof prover="2"><result status="valid" time="0.026938" steps="9606"/></proof>
   </goal>
   <goal name="delete_min&#39;vc.11" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.024066" steps="47"/></proof>
+  <proof prover="2"><result status="valid" time="0.033400" steps="9287"/></proof>
   </goal>
   <goal name="delete_min&#39;vc.12" expl="type invariant" proved="true">
-  <proof prover="6"><result status="valid" time="0.022225" steps="53718"/></proof>
+  <proof prover="2"><result status="valid" time="0.030608" steps="9394"/></proof>
   </goal>
   <goal name="delete_min&#39;vc.13" expl="precondition" proved="true">
-  <proof prover="2"><result status="valid" time="0.044646" steps="9567"/></proof>
+  <proof prover="2"><result status="valid" time="0.033844" steps="9567"/></proof>
   </goal>
   <goal name="delete_min&#39;vc.14" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.044626" steps="474"/></proof>
+  <proof prover="2"><result status="valid" time="0.053333" steps="14107"/></proof>
   </goal>
   <goal name="delete_min&#39;vc.15" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.018017" steps="68"/></proof>
+  <proof prover="2"><result status="valid" time="0.023194" steps="8398"/></proof>
   </goal>
   <goal name="delete_min&#39;vc.16" expl="type invariant" proved="true">
-  <proof prover="2"><result status="valid" time="0.039853" steps="10267"/></proof>
+  <proof prover="2"><result status="valid" time="0.035566" steps="10267"/></proof>
   </goal>
   <goal name="delete_min&#39;vc.17" expl="type invariant" proved="true">
-  <proof prover="6"><result status="valid" time="0.022003" steps="64244"/></proof>
+  <proof prover="2"><result status="valid" time="0.029323" steps="10309"/></proof>
   </goal>
   <goal name="delete_min&#39;vc.18" expl="postcondition" proved="true">
-  <proof prover="2"><result status="valid" time="0.141429" steps="36080"/></proof>
+  <proof prover="2"><result status="valid" time="0.156979" steps="36081"/></proof>
   </goal>
   <goal name="delete_min&#39;vc.19" expl="postcondition" proved="true">
   <transf name="split_vc" proved="true" >
    <goal name="delete_min&#39;vc.19.0" expl="postcondition" proved="true">
-   <proof prover="2"><result status="valid" time="0.299450" steps="63819"/></proof>
+   <proof prover="2"><result status="valid" time="0.281642" steps="63820"/></proof>
    </goal>
    <goal name="delete_min&#39;vc.19.1" expl="postcondition" proved="true">
-   <transf name="split_vc" proved="true" >
-    <goal name="delete_min&#39;vc.19.1.0" expl="postcondition" proved="true">
-    <proof prover="0"><result status="valid" time="0.063699" steps="18441"/></proof>
-    </goal>
-    <goal name="delete_min&#39;vc.19.1.1" expl="postcondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="delete_min&#39;vc.19.1.1.0" expl="postcondition" proved="true">
-     <transf name="split_vc" proved="true" >
-      <goal name="delete_min&#39;vc.19.1.1.0.0" expl="postcondition" proved="true">
-      <proof prover="0"><result status="valid" time="0.372882" steps="56963"/></proof>
-      </goal>
-     </transf>
-     </goal>
-     <goal name="delete_min&#39;vc.19.1.1.1" expl="postcondition" proved="true">
-     <transf name="split_vc" proved="true" >
-      <goal name="delete_min&#39;vc.19.1.1.1.0" expl="postcondition" proved="true">
-      <proof prover="0"><result status="valid" time="0.554940" steps="92528"/></proof>
-      </goal>
-     </transf>
-     </goal>
-    </transf>
-    </goal>
-   </transf>
+   <proof prover="2"><result status="valid" time="0.956960" steps="252512"/></proof>
    </goal>
    <goal name="delete_min&#39;vc.19.2" expl="postcondition" proved="true">
    <transf name="split_vc" proved="true" >
     <goal name="delete_min&#39;vc.19.2.0" expl="postcondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="delete_min&#39;vc.19.2.0.0" expl="postcondition" proved="true">
-     <transf name="split_vc" proved="true" >
-      <goal name="delete_min&#39;vc.19.2.0.0.0" expl="postcondition" proved="true">
-      <transf name="split_vc" proved="true" >
-       <goal name="delete_min&#39;vc.19.2.0.0.0.0" expl="postcondition" proved="true">
-       <transf name="split_vc" proved="true" >
-        <goal name="delete_min&#39;vc.19.2.0.0.0.0.0" expl="postcondition" proved="true">
-        <proof prover="1"><result status="valid" time="0.022017" steps="53"/></proof>
-        </goal>
-       </transf>
-       </goal>
-      </transf>
-      </goal>
-     </transf>
-     </goal>
-    </transf>
+    <proof prover="2"><result status="valid" time="0.032044" steps="9373"/></proof>
     </goal>
     <goal name="delete_min&#39;vc.19.2.1" expl="postcondition" proved="true">
     <transf name="split_vc" proved="true" >
      <goal name="delete_min&#39;vc.19.2.1.0" expl="postcondition" proved="true">
-     <transf name="split_vc" proved="true" >
-      <goal name="delete_min&#39;vc.19.2.1.0.0" expl="postcondition" proved="true">
-      <transf name="split_vc" proved="true" >
-       <goal name="delete_min&#39;vc.19.2.1.0.0.0" expl="postcondition" proved="true">
-       <transf name="split_vc" proved="true" >
-        <goal name="delete_min&#39;vc.19.2.1.0.0.0.0" expl="postcondition" proved="true">
-        <proof prover="0" timelimit="5"><result status="valid" time="0.592981" steps="66639"/></proof>
-        </goal>
-        <goal name="delete_min&#39;vc.19.2.1.0.0.0.1" expl="postcondition" proved="true">
-        <proof prover="1"><result status="valid" time="0.118766" steps="1372"/></proof>
-        </goal>
-       </transf>
-       </goal>
-      </transf>
-      </goal>
-     </transf>
+     <proof prover="2"><result status="valid" time="0.744480" steps="126859"/></proof>
      </goal>
      <goal name="delete_min&#39;vc.19.2.1.1" expl="postcondition" proved="true">
      <transf name="split_vc" proved="true" >
       <goal name="delete_min&#39;vc.19.2.1.1.0" expl="postcondition" proved="true">
-      <transf name="split_vc" proved="true" >
-       <goal name="delete_min&#39;vc.19.2.1.1.0.0" expl="postcondition" proved="true">
-       <transf name="split_vc" proved="true" >
-        <goal name="delete_min&#39;vc.19.2.1.1.0.0.0" expl="postcondition" proved="true">
-        <transf name="inline_goal" proved="true" >
-         <goal name="delete_min&#39;vc.19.2.1.1.0.0.0.0" expl="postcondition" proved="true">
-         <transf name="split_all_full" proved="true" >
-          <goal name="delete_min&#39;vc.19.2.1.1.0.0.0.0.0" expl="postcondition" proved="true">
-          <proof prover="0" timelimit="5"><result status="valid" time="2.700850" steps="783469"/></proof>
-          </goal>
-         </transf>
-         </goal>
-        </transf>
-        </goal>
-        <goal name="delete_min&#39;vc.19.2.1.1.0.0.1" expl="postcondition" proved="true">
-        <proof prover="1"><result status="valid" time="0.030646" steps="205"/></proof>
-        </goal>
-       </transf>
-       </goal>
-      </transf>
+      <proof prover="0"><result status="valid" time="0.676962" steps="271156"/></proof>
       </goal>
      </transf>
      </goal>
@@ -2941,15 +1599,15 @@
    </transf>
    </goal>
    <goal name="delete_min&#39;vc.19.3" expl="postcondition" proved="true">
-   <proof prover="1"><result status="valid" time="0.047870" steps="465"/></proof>
+   <proof prover="2"><result status="valid" time="0.049145" steps="18596"/></proof>
    </goal>
    <goal name="delete_min&#39;vc.19.4" expl="postcondition" proved="true">
-   <proof prover="2"><result status="valid" time="0.064530" steps="19258"/></proof>
+   <proof prover="2"><result status="valid" time="0.059761" steps="19258"/></proof>
    </goal>
   </transf>
   </goal>
   <goal name="delete_min&#39;vc.20" expl="postcondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.018860" steps="28"/></proof>
+  <proof prover="2"><result status="valid" time="0.035223" steps="17584"/></proof>
   </goal>
  </transf>
  </goal>
@@ -2958,111 +1616,107 @@
  <goal name="delete_rec&#39;vc" expl="VC for delete_rec" proved="true">
  <transf name="split_vc" proved="true" >
   <goal name="delete_rec&#39;vc.0" expl="precondition" proved="true">
-  <proof prover="6"><result status="valid" time="0.024390" steps="61647"/></proof>
+  <proof prover="2"><result status="valid" time="0.029362" steps="9806"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.1" expl="precondition" proved="true">
-  <proof prover="6"><result status="valid" time="0.025994" steps="88424"/></proof>
+  <proof prover="1"><result status="valid" time="0.026635" steps="236"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.2" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.016714" steps="40"/></proof>
+  <proof prover="2"><result status="valid" time="0.024688" steps="9286"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.3" expl="precondition" proved="true">
-  <proof prover="2"><result status="valid" time="0.030044" steps="10053"/></proof>
+  <proof prover="2"><result status="valid" time="0.033687" steps="10053"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.4" expl="type invariant" proved="true">
-  <proof prover="2"><result status="valid" time="0.030897" steps="10081"/></proof>
+  <proof prover="2"><result status="valid" time="0.030715" steps="10081"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.5" expl="type invariant" proved="true">
-  <proof prover="1"><result status="valid" time="0.018222" steps="63"/></proof>
+  <proof prover="2"><result status="valid" time="0.034693" steps="10230"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.6" expl="precondition" proved="true">
-  <proof prover="6"><result status="valid" time="0.023603" steps="5432"/></proof>
+  <proof prover="2"><result status="valid" time="0.024588" steps="9453"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.7" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.018026" steps="62"/></proof>
+  <proof prover="2"><result status="valid" time="0.021831" steps="9454"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.8" expl="precondition" proved="true">
-  <proof prover="6"><result status="valid" time="0.024832" steps="69801"/></proof>
+  <proof prover="2"><result status="valid" time="0.031436" steps="10334"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.9" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.023602" steps="75"/></proof>
+  <proof prover="2"><result status="valid" time="0.030976" steps="10364"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.10" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.023429" steps="79"/></proof>
+  <proof prover="2"><result status="valid" time="0.034606" steps="10396"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.11" expl="precondition" proved="true">
-  <proof prover="2"><result status="valid" time="0.030176" steps="9713"/></proof>
+  <proof prover="2"><result status="valid" time="0.017753" steps="9713"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.12" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.016798" steps="86"/></proof>
+  <proof prover="2"><result status="valid" time="0.021951" steps="9668"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.13" expl="type invariant" proved="true">
-  <proof prover="1"><result status="valid" time="0.013692" steps="88"/></proof>
+  <proof prover="2"><result status="valid" time="0.020907" steps="9678"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.14" expl="precondition" proved="true">
-  <proof prover="2"><result status="valid" time="0.028826" steps="10725"/></proof>
+  <proof prover="2"><result status="valid" time="0.032975" steps="10725"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.15" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.235600" steps="3010"/></proof>
+  <proof prover="1"><result status="valid" time="0.156483" steps="2594"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.16" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.127628" steps="1463"/></proof>
+  <proof prover="1"><result status="valid" time="0.098856" steps="1281"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.17" expl="precondition" proved="true">
   <transf name="split_vc" proved="true" >
    <goal name="delete_rec&#39;vc.17.0" expl="precondition" proved="true">
-   <transf name="compute_hyp" proved="true" >
-    <goal name="delete_rec&#39;vc.17.0.0" expl="precondition" proved="true">
-    <proof prover="2"><result status="valid" time="0.215111" steps="54850"/></proof>
-    </goal>
-   </transf>
+   <proof prover="1" timelimit="5" memlimit="2000"><result status="valid" time="1.470063" steps="19106"/></proof>
    </goal>
   </transf>
   </goal>
   <goal name="delete_rec&#39;vc.18" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.033472" steps="113"/></proof>
+  <proof prover="2"><result status="valid" time="0.030066" steps="11395"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.19" expl="type invariant" proved="true">
-  <proof prover="6"><result status="valid" time="0.025276" steps="82780"/></proof>
+  <proof prover="2"><result status="valid" time="0.030808" steps="11899"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.20" expl="type invariant" proved="true">
-  <proof prover="1"><result status="valid" time="0.032140" steps="130"/></proof>
+  <proof prover="2"><result status="valid" time="0.038323" steps="12041"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.21" expl="type invariant" proved="true">
-  <proof prover="1"><result status="valid" time="0.023719" steps="70"/></proof>
+  <proof prover="2"><result status="valid" time="0.021699" steps="9530"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.22" expl="type invariant" proved="true">
-  <proof prover="1"><result status="valid" time="0.020768" steps="72"/></proof>
+  <proof prover="2"><result status="valid" time="0.022799" steps="9557"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.23" expl="type invariant" proved="true">
-  <proof prover="6"><result status="valid" time="0.024681" steps="70743"/></proof>
+  <proof prover="2"><result status="valid" time="0.031646" steps="10469"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.24" expl="precondition" proved="true">
-  <proof prover="2"><result status="valid" time="0.031973" steps="10362"/></proof>
+  <proof prover="2"><result status="valid" time="0.028150" steps="10362"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.25" expl="precondition" proved="true">
-  <proof prover="6"><result status="valid" time="0.025154" steps="70368"/></proof>
+  <proof prover="2"><result status="valid" time="0.042284" steps="10428"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.26" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.026626" steps="80"/></proof>
+  <proof prover="2"><result status="valid" time="0.032670" steps="10458"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.27" expl="precondition" proved="true">
-  <proof prover="2"><result status="valid" time="0.030279" steps="9768"/></proof>
+  <proof prover="2"><result status="valid" time="0.024668" steps="9768"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.28" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.024552" steps="86"/></proof>
+  <proof prover="2"><result status="valid" time="0.024651" steps="9718"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.29" expl="type invariant" proved="true">
-  <proof prover="1"><result status="valid" time="0.020241" steps="88"/></proof>
+  <proof prover="2"><result status="valid" time="0.027864" steps="9728"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.30" expl="precondition" proved="true">
-  <proof prover="6"><result status="valid" time="0.012926" steps="71967"/></proof>
+  <proof prover="2"><result status="valid" time="0.036591" steps="10783"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.31" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.348605" steps="3629"/></proof>
+  <proof prover="1"><result status="valid" time="0.201343" steps="3163"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.32" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.151811" steps="1473"/></proof>
+  <proof prover="1"><result status="valid" time="0.094174" steps="1367"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.33" expl="precondition" proved="true">
   <transf name="split_vc" proved="true" >
@@ -3071,25 +1725,21 @@
     <goal name="delete_rec&#39;vc.33.0.0" expl="precondition" proved="true">
     <transf name="split_all_full" proved="true" >
      <goal name="delete_rec&#39;vc.33.0.0.0" expl="VC for delete_rec" proved="true">
-     <proof prover="1"><result status="valid" time="0.023090" steps="116"/></proof>
+     <proof prover="2"><result status="valid" time="0.032515" steps="11582"/></proof>
      </goal>
      <goal name="delete_rec&#39;vc.33.0.0.1" expl="VC for delete_rec" proved="true">
-     <proof prover="1"><result status="valid" time="0.031551" steps="116"/></proof>
+     <proof prover="2"><result status="valid" time="0.031169" steps="11580"/></proof>
      </goal>
      <goal name="delete_rec&#39;vc.33.0.0.2" expl="VC for delete_rec" proved="true">
-     <proof prover="1"><result status="valid" time="0.119088" steps="1432"/></proof>
+     <proof prover="1"><result status="valid" time="0.100001" steps="1551"/></proof>
      </goal>
      <goal name="delete_rec&#39;vc.33.0.0.3" expl="VC for delete_rec" proved="true">
-     <proof prover="1"><result status="valid" time="0.253161" steps="2905"/></proof>
+     <proof prover="1"><result status="valid" time="0.082771" steps="1302"/></proof>
      </goal>
      <goal name="delete_rec&#39;vc.33.0.0.4" expl="VC for delete_rec" proved="true">
      <transf name="split_vc" proved="true" >
       <goal name="delete_rec&#39;vc.33.0.0.4.0" expl="VC for delete_rec" proved="true">
-      <transf name="compute_hyp" proved="true" >
-       <goal name="delete_rec&#39;vc.33.0.0.4.0.0" expl="VC for delete_rec" proved="true">
-       <proof prover="2"><result status="valid" time="0.095319" steps="32188"/></proof>
-       </goal>
-      </transf>
+      <proof prover="1" timelimit="5" memlimit="2000"><result status="valid" time="3.046679" steps="36816"/></proof>
       </goal>
      </transf>
      </goal>
@@ -3100,211 +1750,153 @@
   </transf>
   </goal>
   <goal name="delete_rec&#39;vc.34" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.024541" steps="114"/></proof>
+  <proof prover="2"><result status="valid" time="0.032666" steps="11431"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.35" expl="type invariant" proved="true">
-  <proof prover="1"><result status="valid" time="0.028981" steps="125"/></proof>
+  <proof prover="2"><result status="valid" time="0.028252" steps="11941"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.36" expl="type invariant" proved="true">
-  <proof prover="6"><result status="valid" time="0.031942" steps="83900"/></proof>
+  <proof prover="2"><result status="valid" time="0.034452" steps="12083"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.37" expl="type invariant" proved="true">
-  <proof prover="1"><result status="valid" time="0.013619" steps="74"/></proof>
+  <proof prover="2"><result status="valid" time="0.015737" steps="9605"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.38" expl="type invariant" proved="true">
-  <proof prover="1"><result status="valid" time="0.019284" steps="76"/></proof>
+  <proof prover="2"><result status="valid" time="0.022139" steps="9632"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.39" expl="type invariant" proved="true">
-  <proof prover="6"><result status="valid" time="0.023768" steps="71213"/></proof>
+  <proof prover="2"><result status="valid" time="0.025949" steps="10592"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.40" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.027977" steps="102"/></proof>
+  <proof prover="2"><result status="valid" time="0.026677" steps="10834"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.41" expl="type invariant" proved="true">
-  <proof prover="1"><result status="valid" time="0.022873" steps="108"/></proof>
+  <proof prover="2"><result status="valid" time="0.032150" steps="10895"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.42" expl="type invariant" proved="true">
-  <proof prover="6"><result status="valid" time="0.025641" steps="75067"/></proof>
+  <proof prover="2"><result status="valid" time="0.025965" steps="10991"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.43" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.061343" steps="793"/></proof>
+  <proof prover="2"><result status="valid" time="0.034329" steps="11749"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.44" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.025983" steps="112"/></proof>
+  <proof prover="2"><result status="valid" time="0.027756" steps="10547"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.45" expl="type invariant" proved="true">
-  <proof prover="6"><result status="valid" time="0.022291" steps="5845"/></proof>
+  <proof prover="2"><result status="valid" time="0.023105" steps="9901"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.46" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.308844" steps="3611"/></proof>
+  <proof prover="1"><result status="valid" time="0.404817" steps="6455"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.47" expl="precondition" proved="true">
-  <proof prover="6"><result status="valid" time="0.017007" steps="34021"/></proof>
+  <proof prover="2"><result status="valid" time="0.029983" steps="10227"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.48" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.027504" steps="85"/></proof>
+  <proof prover="2"><result status="valid" time="0.031341" steps="10595"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.49" expl="type invariant" proved="true">
-  <proof prover="1"><result status="valid" time="0.021477" steps="114"/></proof>
+  <proof prover="2"><result status="valid" time="0.015278" steps="9219"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.50" expl="precondition" proved="true">
-  <proof prover="6"><result status="valid" time="0.024404" steps="73163"/></proof>
+  <proof prover="2"><result status="valid" time="0.071191" steps="19098"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.51" expl="precondition" proved="true">
-  <transf name="split_vc" proved="true" >
-   <goal name="delete_rec&#39;vc.51.0" expl="precondition" proved="true">
-   <transf name="split_vc" proved="true" >
-    <goal name="delete_rec&#39;vc.51.0.0" expl="precondition" proved="true">
-    <proof prover="2"><result status="valid" time="0.194256" steps="29232"/></proof>
-    </goal>
-   </transf>
-   </goal>
-  </transf>
+  <proof prover="2"><result status="valid" time="0.140925" steps="29997"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.52" expl="precondition" proved="true">
-  <proof prover="6"><result status="valid" time="0.023793" steps="73379"/></proof>
+  <proof prover="2"><result status="valid" time="0.032876" steps="11539"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.53" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.025224" steps="120"/></proof>
+  <proof prover="2"><result status="valid" time="0.013314" steps="9246"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.54" expl="type invariant" proved="true">
-  <proof prover="1"><result status="valid" time="0.029877" steps="32"/></proof>
+  <proof prover="2"><result status="valid" time="0.045075" steps="26385"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.55" expl="precondition" proved="true">
-  <proof prover="2"><result status="valid" time="0.723853" steps="108031"/></proof>
+  <proof prover="2"><result status="valid" time="0.480731" steps="108051"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.56" expl="precondition" proved="true">
   <transf name="split_vc" proved="true" >
    <goal name="delete_rec&#39;vc.56.0" expl="precondition" proved="true">
-   <proof prover="2"><result status="valid" time="0.196520" steps="48945"/></proof>
+   <proof prover="2"><result status="valid" time="0.318626" steps="48945"/></proof>
    </goal>
    <goal name="delete_rec&#39;vc.56.1" expl="precondition" proved="true">
-   <transf name="split_vc" proved="true" >
-    <goal name="delete_rec&#39;vc.56.1.0" expl="precondition" proved="true">
-    <proof prover="2"><result status="valid" time="0.190413" steps="26501"/></proof>
-    </goal>
-   </transf>
+   <proof prover="2"><result status="valid" time="0.252750" steps="44451"/></proof>
    </goal>
   </transf>
   </goal>
   <goal name="delete_rec&#39;vc.57" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.026343" steps="41"/></proof>
+  <proof prover="2"><result status="valid" time="0.064355" steps="30023"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.58" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.028620" steps="38"/></proof>
+  <proof prover="2"><result status="valid" time="0.046778" steps="26412"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.59" expl="type invariant" proved="true">
-  <proof prover="2"><result status="valid" time="0.029709" steps="11218"/></proof>
+  <proof prover="2"><result status="valid" time="0.019829" steps="11218"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.60" expl="precondition" proved="true">
-  <proof prover="0" timelimit="5"><result status="valid" time="0.220608" steps="40079"/></proof>
+  <proof prover="2"><result status="valid" time="0.779385" steps="110922"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.61" expl="precondition" proved="true">
   <transf name="split_vc" proved="true" >
    <goal name="delete_rec&#39;vc.61.0" expl="precondition" proved="true">
-   <proof prover="2"><result status="valid" time="0.625227" steps="64567"/></proof>
+   <proof prover="2"><result status="valid" time="0.458547" steps="64577"/></proof>
    </goal>
   </transf>
   </goal>
   <goal name="delete_rec&#39;vc.62" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.035261" steps="60"/></proof>
+  <proof prover="2"><result status="valid" time="0.029355" steps="12788"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.63" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.037449" steps="95"/></proof>
+  <proof prover="2"><result status="valid" time="0.041791" steps="13698"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.64" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.042483" steps="96"/></proof>
+  <proof prover="2"><result status="valid" time="0.042449" steps="13703"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.65" expl="type invariant" proved="true">
-  <proof prover="1"><result status="valid" time="0.044290" steps="97"/></proof>
+  <proof prover="2"><result status="valid" time="0.035326" steps="13732"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.66" expl="type invariant" proved="true">
-  <proof prover="1"><result status="valid" time="0.041090" steps="100"/></proof>
+  <proof prover="2"><result status="valid" time="0.036416" steps="13827"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.67" expl="precondition" proved="true">
-  <proof prover="6"><result status="valid" time="0.028199" steps="93053"/></proof>
+  <proof prover="2"><result status="valid" time="0.039510" steps="14152"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.68" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.044973" steps="134"/></proof>
+  <proof prover="2"><result status="valid" time="0.043149" steps="14157"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.69" expl="type invariant" proved="true">
-  <proof prover="1"><result status="valid" time="0.043501" steps="136"/></proof>
+  <proof prover="2"><result status="valid" time="0.036356" steps="14186"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.70" expl="type invariant" proved="true">
-  <proof prover="6"><result status="valid" time="0.023613" steps="93890"/></proof>
+  <proof prover="2"><result status="valid" time="0.039723" steps="14281"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.71" expl="type invariant" proved="true">
-  <proof prover="1"><result status="valid" time="0.023292" steps="34"/></proof>
+  <proof prover="2"><result status="valid" time="0.022121" steps="10395"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.72" expl="precondition" proved="true">
-  <proof prover="2"><result status="valid" time="0.596910" steps="113665"/></proof>
+  <proof prover="2"><result status="valid" time="0.923223" steps="113665"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.73" expl="precondition" proved="true">
-  <proof prover="0" timelimit="10" memlimit="2000"><result status="valid" time="2.969444" steps="1012499"/></proof>
+  <transf name="split_vc" proved="true" >
+   <goal name="delete_rec&#39;vc.73.0" expl="precondition" proved="true">
+   <proof prover="2"><result status="valid" time="0.418664" steps="65036"/></proof>
+   </goal>
+  </transf>
   </goal>
   <goal name="delete_rec&#39;vc.74" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.031896" steps="60"/></proof>
+  <proof prover="2"><result status="valid" time="0.038102" steps="12738"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.75" expl="precondition" proved="true">
-  <proof prover="6"><result status="valid" time="0.023035" steps="6768"/></proof>
+  <proof prover="2"><result status="valid" time="0.019515" steps="10422"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.76" expl="precondition" proved="true">
   <transf name="split_vc" proved="true" >
    <goal name="delete_rec&#39;vc.76.0" expl="precondition" proved="true">
-   <transf name="split_vc" proved="true" >
-    <goal name="delete_rec&#39;vc.76.0.0" expl="precondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="delete_rec&#39;vc.76.0.0.0" expl="precondition" proved="true">
-     <transf name="split_vc" proved="true" >
-      <goal name="delete_rec&#39;vc.76.0.0.0.0" expl="precondition" proved="true">
-      <transf name="split_vc" proved="true" >
-       <goal name="delete_rec&#39;vc.76.0.0.0.0.0" expl="precondition" proved="true">
-       <transf name="split_vc" proved="true" >
-        <goal name="delete_rec&#39;vc.76.0.0.0.0.0.0" expl="precondition" proved="true">
-        <proof prover="2" timelimit="5" memlimit="2000"><result status="valid" time="0.542795" steps="54371"/></proof>
-        </goal>
-       </transf>
-       </goal>
-      </transf>
-      </goal>
-     </transf>
-     </goal>
-    </transf>
-    </goal>
-    <goal name="delete_rec&#39;vc.76.0.1" expl="precondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="delete_rec&#39;vc.76.0.1.0" expl="precondition" proved="true">
-     <transf name="split_vc" proved="true" >
-      <goal name="delete_rec&#39;vc.76.0.1.0.0" expl="precondition" proved="true">
-      <transf name="split_vc" proved="true" >
-       <goal name="delete_rec&#39;vc.76.0.1.0.0.0" expl="precondition" proved="true">
-       <transf name="split_vc" proved="true" >
-        <goal name="delete_rec&#39;vc.76.0.1.0.0.0.0" expl="precondition" proved="true">
-        <proof prover="2" timelimit="5" memlimit="2000"><result status="valid" time="0.302119" steps="39869"/></proof>
-        </goal>
-       </transf>
-       </goal>
-       <goal name="delete_rec&#39;vc.76.0.1.0.0.1" expl="precondition" proved="true">
-       <proof prover="2"><result status="valid" time="0.127545" steps="36359"/></proof>
-       </goal>
-      </transf>
-      </goal>
-     </transf>
-     </goal>
-    </transf>
-    </goal>
-   </transf>
+   <proof prover="2"><result status="valid" time="0.902641" steps="162921"/></proof>
    </goal>
    <goal name="delete_rec&#39;vc.76.1" expl="precondition" proved="true">
-   <transf name="split_vc" proved="true" >
-    <goal name="delete_rec&#39;vc.76.1.0" expl="precondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="delete_rec&#39;vc.76.1.0.0" expl="precondition" proved="true">
-     <proof prover="2"><result status="valid" time="0.239958" steps="50229"/></proof>
-     </goal>
-    </transf>
-    </goal>
-   </transf>
+   <proof prover="2"><result status="valid" time="0.660979" steps="108420"/></proof>
    </goal>
    <goal name="delete_rec&#39;vc.76.2" expl="precondition" proved="true">
    <transf name="split_vc" proved="true" >
@@ -3317,10 +1909,10 @@
        <goal name="delete_rec&#39;vc.76.2.0.0.0.0" expl="precondition" proved="true">
        <transf name="split_vc" proved="true" >
         <goal name="delete_rec&#39;vc.76.2.0.0.0.0.0" expl="precondition" proved="true">
-        <proof prover="2" timelimit="5" memlimit="2000"><result status="valid" time="1.010212" steps="175838"/></proof>
+        <proof prover="2"><result status="valid" time="0.735278" steps="175838"/></proof>
         </goal>
         <goal name="delete_rec&#39;vc.76.2.0.0.0.0.1" expl="precondition" proved="true">
-        <proof prover="2"><result status="valid" time="0.798638" steps="132072"/></proof>
+        <proof prover="2"><result status="valid" time="0.534148" steps="131934"/></proof>
         </goal>
        </transf>
        </goal>
@@ -3333,15 +1925,7 @@
     <goal name="delete_rec&#39;vc.76.2.1" expl="precondition" proved="true">
     <transf name="split_vc" proved="true" >
      <goal name="delete_rec&#39;vc.76.2.1.0" expl="precondition" proved="true">
-     <transf name="split_vc" proved="true" >
-      <goal name="delete_rec&#39;vc.76.2.1.0.0" expl="precondition" proved="true">
-      <transf name="split_vc" proved="true" >
-       <goal name="delete_rec&#39;vc.76.2.1.0.0.0" expl="precondition" proved="true">
-       <proof prover="0"><result status="valid" time="0.614255" steps="92549"/></proof>
-       </goal>
-      </transf>
-      </goal>
-     </transf>
+     <proof prover="2"><result status="valid" time="0.618674" steps="96834"/></proof>
      </goal>
     </transf>
     </goal>
@@ -3352,110 +1936,48 @@
   <goal name="delete_rec&#39;vc.77" expl="precondition" proved="true">
   <transf name="split_vc" proved="true" >
    <goal name="delete_rec&#39;vc.77.0" expl="precondition" proved="true">
-   <transf name="split_vc" proved="true" >
-    <goal name="delete_rec&#39;vc.77.0.0" expl="precondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="delete_rec&#39;vc.77.0.0.0" expl="precondition" proved="true">
-     <proof prover="0"><result status="valid" time="0.122348" steps="22305"/></proof>
-     </goal>
-    </transf>
-    </goal>
-    <goal name="delete_rec&#39;vc.77.0.1" expl="precondition" proved="true">
-    <proof prover="1"><result status="valid" time="0.026512" steps="77"/></proof>
-    </goal>
-   </transf>
+   <proof prover="2"><result status="valid" time="0.069165" steps="32123"/></proof>
    </goal>
    <goal name="delete_rec&#39;vc.77.1" expl="precondition" proved="true">
-   <transf name="split_vc" proved="true" >
-    <goal name="delete_rec&#39;vc.77.1.0" expl="precondition" proved="true">
-    <proof prover="1"><result status="valid" time="0.242938" steps="2775"/></proof>
-    </goal>
-   </transf>
+   <proof prover="2"><result status="valid" time="0.453694" steps="74749"/></proof>
    </goal>
    <goal name="delete_rec&#39;vc.77.2" expl="precondition" proved="true">
-   <proof prover="2"><result status="valid" time="0.841945" steps="76195"/></proof>
+   <proof prover="2"><result status="valid" time="0.609017" steps="76195"/></proof>
    </goal>
   </transf>
   </goal>
   <goal name="delete_rec&#39;vc.78" expl="precondition" proved="true">
-  <transf name="split_vc" proved="true" >
-   <goal name="delete_rec&#39;vc.78.0" expl="precondition" proved="true">
-   <transf name="split_vc" proved="true" >
-    <goal name="delete_rec&#39;vc.78.0.0" expl="precondition" proved="true">
-    <proof prover="2"><result status="valid" time="0.253853" steps="57390"/></proof>
-    </goal>
-    <goal name="delete_rec&#39;vc.78.0.1" expl="precondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="delete_rec&#39;vc.78.0.1.0" expl="precondition" proved="true">
-     <proof prover="1"><result status="valid" time="0.099676" steps="1457"/></proof>
-     </goal>
-    </transf>
-    </goal>
-   </transf>
-   </goal>
-   <goal name="delete_rec&#39;vc.78.1" expl="precondition" proved="true">
-   <proof prover="2"><result status="valid" time="0.268388" steps="39146"/></proof>
-   </goal>
-   <goal name="delete_rec&#39;vc.78.2" expl="precondition" proved="true">
-   <proof prover="6" timelimit="5"><result status="valid" time="0.329463" steps="1130298"/></proof>
-   </goal>
-  </transf>
+  <proof prover="2"><result status="valid" time="0.317091" steps="106629"/></proof>
   </goal>
-  <goal name="delete_rec&#39;vc.79" expl="precondition" proved="true">
-  <transf name="split_vc" proved="true" >
-   <goal name="delete_rec&#39;vc.79.0" expl="precondition" proved="true">
-   <transf name="split_vc" proved="true" >
-    <goal name="delete_rec&#39;vc.79.0.0" expl="precondition" proved="true">
-    <proof prover="2"><result status="valid" time="0.503885" steps="56844"/></proof>
-    </goal>
-    <goal name="delete_rec&#39;vc.79.0.1" expl="precondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="delete_rec&#39;vc.79.0.1.0" expl="precondition" proved="true">
-     <proof prover="1"><result status="valid" time="0.204397" steps="3022"/></proof>
-     </goal>
-    </transf>
-    </goal>
-   </transf>
+  <goal name="delete_rec&#39;vc.79" expl="precondition" proved="true">
+  <transf name="split_vc" proved="true" >
+   <goal name="delete_rec&#39;vc.79.0" expl="precondition" proved="true">
+   <proof prover="2"><result status="valid" time="0.381201" steps="84634"/></proof>
    </goal>
    <goal name="delete_rec&#39;vc.79.1" expl="precondition" proved="true">
-   <transf name="split_vc" proved="true" >
-    <goal name="delete_rec&#39;vc.79.1.0" expl="precondition" proved="true">
-    <proof prover="1"><result status="valid" time="0.548380" steps="7203"/></proof>
-    </goal>
-   </transf>
+   <proof prover="2"><result status="valid" time="0.422678" steps="74536"/></proof>
    </goal>
    <goal name="delete_rec&#39;vc.79.2" expl="precondition" proved="true">
-   <transf name="split_vc" proved="true" >
-    <goal name="delete_rec&#39;vc.79.2.0" expl="precondition" proved="true">
-    <proof prover="2"><result status="valid" time="0.570707" steps="60244"/></proof>
-    </goal>
-    <goal name="delete_rec&#39;vc.79.2.1" expl="precondition" proved="true">
-    <proof prover="2"><result status="valid" time="0.260923" steps="57743"/></proof>
-    </goal>
-   </transf>
+   <proof prover="2"><result status="valid" time="0.616162" steps="76133"/></proof>
    </goal>
   </transf>
   </goal>
   <goal name="delete_rec&#39;vc.80" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.037275" steps="41"/></proof>
+  <proof prover="2"><result status="valid" time="0.118906" steps="74274"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.81" expl="type invariant" proved="true">
-  <proof prover="1"><result status="valid" time="0.038779" steps="55"/></proof>
+  <proof prover="2"><result status="valid" time="0.129756" steps="74320"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.82" expl="type invariant" proved="true">
-  <proof prover="6"><result status="valid" time="0.025332" steps="159951"/></proof>
+  <proof prover="2"><result status="valid" time="0.129114" steps="74331"/></proof>
   </goal>
   <goal name="delete_rec&#39;vc.83" expl="postcondition" proved="true">
   <transf name="split_vc" proved="true" >
    <goal name="delete_rec&#39;vc.83.0" expl="postcondition" proved="true">
-   <transf name="split_vc" proved="true" >
-    <goal name="delete_rec&#39;vc.83.0.0" expl="postcondition" proved="true">
-    <proof prover="6"><result status="valid" time="0.066424" steps="75013"/></proof>
-    </goal>
-   </transf>
+   <proof prover="2"><result status="valid" time="0.039379" steps="12694"/></proof>
    </goal>
    <goal name="delete_rec&#39;vc.83.1" expl="postcondition" proved="true">
-   <proof prover="2"><result status="valid" time="0.119240" steps="33428"/></proof>
+   <proof prover="2"><result status="valid" time="0.177397" steps="33428"/></proof>
    </goal>
    <goal name="delete_rec&#39;vc.83.2" expl="postcondition" proved="true">
    <transf name="split_vc" proved="true" >
@@ -3464,31 +1986,27 @@
      <goal name="delete_rec&#39;vc.83.2.0.0" expl="postcondition" proved="true">
      <transf name="split_vc" proved="true" >
       <goal name="delete_rec&#39;vc.83.2.0.0.0" expl="postcondition" proved="true">
-      <proof prover="2"><result status="valid" time="0.546654" steps="61593"/></proof>
+      <proof prover="2"><result status="valid" time="0.365038" steps="61593"/></proof>
       </goal>
      </transf>
      </goal>
      <goal name="delete_rec&#39;vc.83.2.0.1" expl="postcondition" proved="true">
-     <transf name="split_vc" proved="true" >
-      <goal name="delete_rec&#39;vc.83.2.0.1.0" expl="postcondition" proved="true">
-      <proof prover="6" timelimit="5"><result status="valid" time="0.033828" steps="121075"/></proof>
-      </goal>
-     </transf>
+     <proof prover="2"><result status="valid" time="0.214507" steps="39261"/></proof>
      </goal>
     </transf>
     </goal>
     <goal name="delete_rec&#39;vc.83.2.1" expl="postcondition" proved="true">
-    <proof prover="6" timelimit="5"><result status="valid" time="0.416279" steps="526053"/></proof>
+    <proof prover="2"><result status="valid" time="0.303849" steps="57524"/></proof>
     </goal>
     <goal name="delete_rec&#39;vc.83.2.2" expl="postcondition" proved="true">
     <transf name="split_vc" proved="true" >
      <goal name="delete_rec&#39;vc.83.2.2.0" expl="postcondition" proved="true">
-     <proof prover="6"><result status="valid" time="0.570278" steps="1941099"/></proof>
+     <proof prover="6"><result status="valid" time="0.756991" steps="1941099"/></proof>
      </goal>
      <goal name="delete_rec&#39;vc.83.2.2.1" expl="postcondition" proved="true">
      <transf name="split_vc" proved="true" >
       <goal name="delete_rec&#39;vc.83.2.2.1.0" expl="postcondition" proved="true">
-      <proof prover="6"><result status="valid" time="0.630143" steps="1950901"/></proof>
+      <proof prover="2"><result status="valid" time="0.757451" steps="94751"/></proof>
       </goal>
      </transf>
      </goal>
@@ -3501,43 +2019,21 @@
   <goal name="delete_rec&#39;vc.84" expl="postcondition" proved="true">
   <transf name="split_vc" proved="true" >
    <goal name="delete_rec&#39;vc.84.0" expl="postcondition" proved="true">
-   <transf name="split_vc" proved="true" >
-    <goal name="delete_rec&#39;vc.84.0.0" expl="postcondition" proved="true">
-    <proof prover="2"><result status="valid" time="0.026570" steps="11646"/></proof>
-    </goal>
-   </transf>
+   <proof prover="2"><result status="valid" time="0.040831" steps="12834"/></proof>
    </goal>
    <goal name="delete_rec&#39;vc.84.1" expl="postcondition" proved="true">
-   <proof prover="2"><result status="valid" time="0.125993" steps="36612"/></proof>
+   <proof prover="2"><result status="valid" time="0.198804" steps="36612"/></proof>
    </goal>
    <goal name="delete_rec&#39;vc.84.2" expl="postcondition" proved="true">
    <transf name="split_vc" proved="true" >
     <goal name="delete_rec&#39;vc.84.2.0" expl="postcondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="delete_rec&#39;vc.84.2.0.0" expl="postcondition" proved="true">
-     <transf name="split_vc" proved="true" >
-      <goal name="delete_rec&#39;vc.84.2.0.0.0" expl="postcondition" proved="true">
-      <proof prover="0"><result status="valid" time="0.313997" steps="32095"/></proof>
-      </goal>
-     </transf>
-     </goal>
-     <goal name="delete_rec&#39;vc.84.2.0.1" expl="postcondition" proved="true">
-     <proof prover="6" timelimit="5"><result status="valid" time="0.179100" steps="646900"/></proof>
-     </goal>
-    </transf>
+    <proof prover="2"><result status="valid" time="0.404199" steps="84284"/></proof>
     </goal>
     <goal name="delete_rec&#39;vc.84.2.1" expl="postcondition" proved="true">
-    <proof prover="2"><result status="valid" time="0.380753" steps="47592"/></proof>
+    <proof prover="2"><result status="valid" time="0.239803" steps="47592"/></proof>
     </goal>
     <goal name="delete_rec&#39;vc.84.2.2" expl="postcondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="delete_rec&#39;vc.84.2.2.0" expl="postcondition" proved="true">
-     <proof prover="2"><result status="valid" time="0.788647" steps="73238"/></proof>
-     </goal>
-     <goal name="delete_rec&#39;vc.84.2.2.1" expl="postcondition" proved="true">
-     <proof prover="2"><result status="valid" time="0.699481" steps="69150"/></proof>
-     </goal>
-    </transf>
+    <proof prover="2"><result status="valid" time="0.691907" steps="87375"/></proof>
     </goal>
    </transf>
    </goal>
@@ -3548,47 +2044,35 @@
    <goal name="delete_rec&#39;vc.85.0" expl="postcondition" proved="true">
    <transf name="split_vc" proved="true" >
     <goal name="delete_rec&#39;vc.85.0.0" expl="postcondition" proved="true">
-    <proof prover="1"><result status="valid" time="0.472975" steps="5827"/></proof>
+    <proof prover="1"><result status="valid" time="0.328592" steps="5045"/></proof>
     </goal>
     <goal name="delete_rec&#39;vc.85.0.1" expl="postcondition" proved="true">
-    <proof prover="2"><result status="valid" time="0.130373" steps="35296"/></proof>
+    <proof prover="2"><result status="valid" time="0.187315" steps="35296"/></proof>
     </goal>
     <goal name="delete_rec&#39;vc.85.0.2" expl="postcondition" proved="true">
     <transf name="split_vc" proved="true" >
      <goal name="delete_rec&#39;vc.85.0.2.0" expl="postcondition" proved="true">
      <transf name="split_vc" proved="true" >
       <goal name="delete_rec&#39;vc.85.0.2.0.0" expl="postcondition" proved="true">
-      <transf name="split_vc" proved="true" >
-       <goal name="delete_rec&#39;vc.85.0.2.0.0.0" expl="postcondition" proved="true">
-       <proof prover="2"><result status="valid" time="0.452398" steps="54954"/></proof>
-       </goal>
-      </transf>
+      <proof prover="2"><result status="valid" time="0.852891" steps="93998"/></proof>
       </goal>
       <goal name="delete_rec&#39;vc.85.0.2.0.1" expl="postcondition" proved="true">
-      <transf name="split_vc" proved="true" >
-       <goal name="delete_rec&#39;vc.85.0.2.0.1.0" expl="postcondition" proved="true">
-       <proof prover="0"><result status="valid" time="0.235699" steps="34686"/></proof>
-       </goal>
-      </transf>
+      <proof prover="2"><result status="valid" time="0.406441" steps="61851"/></proof>
       </goal>
      </transf>
      </goal>
      <goal name="delete_rec&#39;vc.85.0.2.1" expl="postcondition" proved="true">
-     <transf name="split_vc" proved="true" >
-      <goal name="delete_rec&#39;vc.85.0.2.1.0" expl="postcondition" proved="true">
-      <proof prover="1" timelimit="5"><result status="valid" time="1.105316" steps="13398"/></proof>
-      </goal>
-     </transf>
+     <proof prover="2"><result status="valid" time="0.587891" steps="95938"/></proof>
      </goal>
      <goal name="delete_rec&#39;vc.85.0.2.2" expl="postcondition" proved="true">
      <transf name="split_vc" proved="true" >
       <goal name="delete_rec&#39;vc.85.0.2.2.0" expl="postcondition" proved="true">
-      <proof prover="2"><result status="valid" time="0.037432" steps="12754"/></proof>
+      <proof prover="2"><result status="valid" time="0.022497" steps="12754"/></proof>
       </goal>
       <goal name="delete_rec&#39;vc.85.0.2.2.1" expl="postcondition" proved="true">
       <transf name="split_vc" proved="true" >
        <goal name="delete_rec&#39;vc.85.0.2.2.1.0" expl="postcondition" proved="true">
-       <proof prover="2"><result status="valid" time="0.593813" steps="61889"/></proof>
+       <proof prover="2"><result status="valid" time="0.397510" steps="61889"/></proof>
        </goal>
       </transf>
       </goal>
@@ -3601,36 +2085,21 @@
    <goal name="delete_rec&#39;vc.85.1" expl="postcondition" proved="true">
    <transf name="split_vc" proved="true" >
     <goal name="delete_rec&#39;vc.85.1.0" expl="postcondition" proved="true">
-    <proof prover="2"><result status="valid" time="0.015846" steps="11311"/></proof>
+    <proof prover="2"><result status="valid" time="0.055721" steps="11311"/></proof>
     </goal>
     <goal name="delete_rec&#39;vc.85.1.1" expl="postcondition" proved="true">
-    <proof prover="2"><result status="valid" time="0.160846" steps="34797"/></proof>
+    <proof prover="2"><result status="valid" time="0.179492" steps="34797"/></proof>
     </goal>
     <goal name="delete_rec&#39;vc.85.1.2" expl="postcondition" proved="true">
     <transf name="split_vc" proved="true" >
      <goal name="delete_rec&#39;vc.85.1.2.0" expl="postcondition" proved="true">
-     <transf name="split_vc" proved="true" >
-      <goal name="delete_rec&#39;vc.85.1.2.0.0" expl="postcondition" proved="true">
-      <transf name="split_vc" proved="true" >
-       <goal name="delete_rec&#39;vc.85.1.2.0.0.0" expl="postcondition" proved="true">
-       <proof prover="0"><result status="valid" time="0.139059" steps="22089"/></proof>
-       </goal>
-      </transf>
-      </goal>
-      <goal name="delete_rec&#39;vc.85.1.2.0.1" expl="postcondition" proved="true">
-      <transf name="split_vc" proved="true" >
-       <goal name="delete_rec&#39;vc.85.1.2.0.1.0" expl="postcondition" proved="true">
-       <proof prover="1"><result status="valid" time="0.048858" steps="596"/></proof>
-       </goal>
-      </transf>
-      </goal>
-     </transf>
+     <proof prover="2"><result status="valid" time="0.056721" steps="28224"/></proof>
      </goal>
      <goal name="delete_rec&#39;vc.85.1.2.1" expl="postcondition" proved="true">
-     <proof prover="2"><result status="valid" time="0.302603" steps="41051"/></proof>
+     <proof prover="2"><result status="valid" time="0.208181" steps="41051"/></proof>
      </goal>
      <goal name="delete_rec&#39;vc.85.1.2.2" expl="postcondition" proved="true">
-     <proof prover="2"><result status="valid" time="0.868974" steps="81397"/></proof>
+     <proof prover="2"><result status="valid" time="0.689662" steps="81397"/></proof>
      </goal>
     </transf>
     </goal>
@@ -3639,59 +2108,21 @@
    <goal name="delete_rec&#39;vc.85.2" expl="postcondition" proved="true">
    <transf name="split_vc" proved="true" >
     <goal name="delete_rec&#39;vc.85.2.0" expl="postcondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="delete_rec&#39;vc.85.2.0.0" expl="postcondition" proved="true">
-     <proof prover="2"><result status="valid" time="0.114372" steps="9939"/></proof>
-     </goal>
-    </transf>
+    <proof prover="2"><result status="valid" time="0.025047" steps="11313"/></proof>
     </goal>
     <goal name="delete_rec&#39;vc.85.2.1" expl="postcondition" proved="true">
-    <proof prover="2"><result status="valid" time="0.168343" steps="44598"/></proof>
+    <proof prover="2"><result status="valid" time="0.230246" steps="44598"/></proof>
     </goal>
     <goal name="delete_rec&#39;vc.85.2.2" expl="postcondition" proved="true">
     <transf name="split_vc" proved="true" >
      <goal name="delete_rec&#39;vc.85.2.2.0" expl="postcondition" proved="true">
-     <transf name="split_vc" proved="true" >
-      <goal name="delete_rec&#39;vc.85.2.2.0.0" expl="postcondition" proved="true">
-      <transf name="split_vc" proved="true" >
-       <goal name="delete_rec&#39;vc.85.2.2.0.0.0" expl="postcondition" proved="true">
-       <transf name="split_vc" proved="true" >
-        <goal name="delete_rec&#39;vc.85.2.2.0.0.0.0" expl="postcondition" proved="true">
-        <proof prover="0"><result status="valid" time="0.296281" steps="45139"/></proof>
-        </goal>
-       </transf>
-       </goal>
-      </transf>
-      </goal>
-      <goal name="delete_rec&#39;vc.85.2.2.0.1" expl="postcondition" proved="true">
-      <transf name="split_vc" proved="true" >
-       <goal name="delete_rec&#39;vc.85.2.2.0.1.0" expl="postcondition" proved="true">
-       <proof prover="0" timelimit="5"><result status="valid" time="0.237125" steps="28023"/></proof>
-       </goal>
-      </transf>
-      </goal>
-     </transf>
+     <proof prover="2"><result status="valid" time="0.483817" steps="93179"/></proof>
      </goal>
      <goal name="delete_rec&#39;vc.85.2.2.1" expl="postcondition" proved="true">
-     <proof prover="0" timelimit="5"><result status="valid" time="2.613597" steps="394207"/></proof>
+     <proof prover="2"><result status="valid" time="0.558289" steps="88986"/></proof>
      </goal>
      <goal name="delete_rec&#39;vc.85.2.2.2" expl="postcondition" proved="true">
-     <transf name="split_vc" proved="true" >
-      <goal name="delete_rec&#39;vc.85.2.2.2.0" expl="postcondition" proved="true">
-      <transf name="split_vc" proved="true" >
-       <goal name="delete_rec&#39;vc.85.2.2.2.0.0" expl="postcondition" proved="true">
-       <proof prover="2"><result status="valid" time="0.779626" steps="73366"/></proof>
-       </goal>
-      </transf>
-      </goal>
-      <goal name="delete_rec&#39;vc.85.2.2.2.1" expl="postcondition" proved="true">
-      <transf name="split_vc" proved="true" >
-       <goal name="delete_rec&#39;vc.85.2.2.2.1.0" expl="postcondition" proved="true">
-       <proof prover="2"><result status="valid" time="0.522077" steps="58249"/></proof>
-       </goal>
-      </transf>
-      </goal>
-     </transf>
+     <proof prover="6"><result status="valid" time="0.908257" steps="2203077"/></proof>
      </goal>
     </transf>
     </goal>
@@ -3704,10 +2135,10 @@
    <goal name="delete_rec&#39;vc.86.0" expl="postcondition" proved="true">
    <transf name="split_vc" proved="true" >
     <goal name="delete_rec&#39;vc.86.0.0" expl="postcondition" proved="true">
-    <proof prover="2"><result status="valid" time="0.028976" steps="13223"/></proof>
+    <proof prover="2"><result status="valid" time="0.041112" steps="13223"/></proof>
     </goal>
     <goal name="delete_rec&#39;vc.86.0.1" expl="postcondition" proved="true">
-    <proof prover="2"><result status="valid" time="0.138568" steps="38653"/></proof>
+    <proof prover="2"><result status="valid" time="0.195971" steps="38653"/></proof>
     </goal>
     <goal name="delete_rec&#39;vc.86.0.2" expl="postcondition" proved="true">
     <transf name="split_vc" proved="true" >
@@ -3716,129 +2147,31 @@
       <goal name="delete_rec&#39;vc.86.0.2.0.0" expl="postcondition" proved="true">
       <transf name="split_vc" proved="true" >
        <goal name="delete_rec&#39;vc.86.0.2.0.0.0" expl="postcondition" proved="true">
-       <transf name="split_vc" proved="true" >
-        <goal name="delete_rec&#39;vc.86.0.2.0.0.0.0" expl="postcondition" proved="true">
-        <transf name="split_vc" proved="true" >
-         <goal name="delete_rec&#39;vc.86.0.2.0.0.0.0.0" expl="postcondition" proved="true">
-         <transf name="split_vc" proved="true" >
-          <goal name="delete_rec&#39;vc.86.0.2.0.0.0.0.0.0" expl="postcondition" proved="true">
-          <transf name="inline_goal" proved="true" >
-           <goal name="delete_rec&#39;vc.86.0.2.0.0.0.0.0.0.0" expl="postcondition" proved="true">
-           <transf name="split_all_full" proved="true" >
-            <goal name="delete_rec&#39;vc.86.0.2.0.0.0.0.0.0.0.0" expl="postcondition" proved="true">
-            <transf name="split_vc" proved="true" >
-             <goal name="delete_rec&#39;vc.86.0.2.0.0.0.0.0.0.0.0.0" expl="postcondition" proved="true">
-             <proof prover="2" timelimit="15" memlimit="2000"><result status="valid" time="0.547971" steps="66623"/></proof>
-             </goal>
-            </transf>
-            </goal>
-           </transf>
-           </goal>
-          </transf>
-          </goal>
-         </transf>
-         </goal>
-        </transf>
-        </goal>
-       </transf>
+       <proof prover="2"><result status="valid" time="0.713105" steps="101622"/></proof>
        </goal>
       </transf>
       </goal>
       <goal name="delete_rec&#39;vc.86.0.2.0.1" expl="postcondition" proved="true">
-      <transf name="split_vc" proved="true" >
-       <goal name="delete_rec&#39;vc.86.0.2.0.1.0" expl="postcondition" proved="true">
-       <transf name="split_vc" proved="true" >
-        <goal name="delete_rec&#39;vc.86.0.2.0.1.0.0" expl="postcondition" proved="true">
-        <transf name="split_vc" proved="true" >
-         <goal name="delete_rec&#39;vc.86.0.2.0.1.0.0.0" expl="postcondition" proved="true">
-         <transf name="split_vc" proved="true" >
-          <goal name="delete_rec&#39;vc.86.0.2.0.1.0.0.0.0" expl="postcondition" proved="true">
-          <proof prover="2" timelimit="5" memlimit="2000"><result status="valid" time="0.292815" steps="42029"/></proof>
-          </goal>
-         </transf>
-         </goal>
-         <goal name="delete_rec&#39;vc.86.0.2.0.1.0.0.1" expl="postcondition" proved="true">
-         <proof prover="1"><result status="valid" time="0.299713" steps="4304"/></proof>
-         </goal>
-        </transf>
-        </goal>
-       </transf>
-       </goal>
-      </transf>
+      <proof prover="2"><result status="valid" time="0.490506" steps="75292"/></proof>
       </goal>
      </transf>
      </goal>
      <goal name="delete_rec&#39;vc.86.0.2.1" expl="postcondition" proved="true">
-     <transf name="split_vc" proved="true" >
-      <goal name="delete_rec&#39;vc.86.0.2.1.0" expl="postcondition" proved="true">
-      <transf name="split_vc" proved="true" >
-       <goal name="delete_rec&#39;vc.86.0.2.1.0.0" expl="postcondition" proved="true">
-       <transf name="split_vc" proved="true" >
-        <goal name="delete_rec&#39;vc.86.0.2.1.0.0.0" expl="postcondition" proved="true">
-        <transf name="split_vc" proved="true" >
-         <goal name="delete_rec&#39;vc.86.0.2.1.0.0.0.0" expl="postcondition" proved="true">
-         <transf name="split_vc" proved="true" >
-          <goal name="delete_rec&#39;vc.86.0.2.1.0.0.0.0.0" expl="postcondition" proved="true">
-          <proof prover="1" timelimit="5" memlimit="2000"><result status="valid" time="2.394068" steps="28957"/></proof>
-          </goal>
-         </transf>
-         </goal>
-        </transf>
-        </goal>
-       </transf>
-       </goal>
-      </transf>
-      </goal>
-     </transf>
+     <proof prover="2"><result status="valid" time="0.884231" steps="136872"/></proof>
      </goal>
      <goal name="delete_rec&#39;vc.86.0.2.2" expl="postcondition" proved="true">
      <transf name="split_vc" proved="true" >
       <goal name="delete_rec&#39;vc.86.0.2.2.0" expl="postcondition" proved="true">
       <transf name="split_vc" proved="true" >
        <goal name="delete_rec&#39;vc.86.0.2.2.0.0" expl="postcondition" proved="true">
-       <transf name="split_vc" proved="true" >
-        <goal name="delete_rec&#39;vc.86.0.2.2.0.0.0" expl="postcondition" proved="true">
-        <transf name="split_vc" proved="true" >
-         <goal name="delete_rec&#39;vc.86.0.2.2.0.0.0.0" expl="postcondition" proved="true">
-         <transf name="split_vc" proved="true" >
-          <goal name="delete_rec&#39;vc.86.0.2.2.0.0.0.0.0" expl="postcondition" proved="true">
-          <transf name="inline_goal" proved="true" >
-           <goal name="delete_rec&#39;vc.86.0.2.2.0.0.0.0.0.0" expl="postcondition" proved="true">
-           <transf name="split_all_full" proved="true" >
-            <goal name="delete_rec&#39;vc.86.0.2.2.0.0.0.0.0.0.0" expl="postcondition" proved="true">
-            <transf name="split_vc" proved="true" >
-             <goal name="delete_rec&#39;vc.86.0.2.2.0.0.0.0.0.0.0.0" expl="postcondition" proved="true">
-             <proof prover="2" timelimit="10" memlimit="4000"><result status="valid" time="5.583858" steps="559142"/></proof>
-             </goal>
-            </transf>
-            </goal>
-           </transf>
-           </goal>
-          </transf>
-          </goal>
-          <goal name="delete_rec&#39;vc.86.0.2.2.0.0.0.0.1" expl="postcondition" proved="true">
-          <proof prover="2"><result status="valid" time="0.237532" steps="31320"/></proof>
-          </goal>
-         </transf>
-         </goal>
-        </transf>
-        </goal>
-       </transf>
+       <proof prover="2"><result status="valid" time="0.885310" steps="90073"/></proof>
        </goal>
       </transf>
       </goal>
       <goal name="delete_rec&#39;vc.86.0.2.2.1" expl="postcondition" proved="true">
       <transf name="split_vc" proved="true" >
        <goal name="delete_rec&#39;vc.86.0.2.2.1.0" expl="postcondition" proved="true">
-       <transf name="split_vc" proved="true" >
-        <goal name="delete_rec&#39;vc.86.0.2.2.1.0.0" expl="postcondition" proved="true">
-        <transf name="split_vc" proved="true" >
-         <goal name="delete_rec&#39;vc.86.0.2.2.1.0.0.0" expl="postcondition" proved="true">
-         <proof prover="2"><result status="valid" time="0.884815" steps="81716"/></proof>
-         </goal>
-        </transf>
-        </goal>
-       </transf>
+       <proof prover="2"><result status="valid" time="0.678657" steps="81780"/></proof>
        </goal>
       </transf>
       </goal>
@@ -3851,49 +2184,25 @@
    <goal name="delete_rec&#39;vc.86.1" expl="postcondition" proved="true">
    <transf name="split_vc" proved="true" >
     <goal name="delete_rec&#39;vc.86.1.0" expl="postcondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="delete_rec&#39;vc.86.1.0.0" expl="postcondition" proved="true">
-     <transf name="split_vc" proved="true" >
-      <goal name="delete_rec&#39;vc.86.1.0.0.0" expl="postcondition" proved="true">
-      <proof prover="6"><result status="valid" time="0.060496" steps="76936"/></proof>
-      </goal>
-     </transf>
-     </goal>
-    </transf>
+    <proof prover="2"><result status="valid" time="0.040180" steps="13183"/></proof>
     </goal>
     <goal name="delete_rec&#39;vc.86.1.1" expl="postcondition" proved="true">
-    <proof prover="2"><result status="valid" time="0.194190" steps="39675"/></proof>
+    <proof prover="2"><result status="valid" time="0.205695" steps="39675"/></proof>
     </goal>
     <goal name="delete_rec&#39;vc.86.1.2" expl="postcondition" proved="true">
     <transf name="split_vc" proved="true" >
      <goal name="delete_rec&#39;vc.86.1.2.0" expl="postcondition" proved="true">
      <transf name="split_vc" proved="true" >
       <goal name="delete_rec&#39;vc.86.1.2.0.0" expl="postcondition" proved="true">
-      <transf name="split_vc" proved="true" >
-       <goal name="delete_rec&#39;vc.86.1.2.0.0.0" expl="postcondition" proved="true">
-       <transf name="split_vc" proved="true" >
-        <goal name="delete_rec&#39;vc.86.1.2.0.0.0.0" expl="postcondition" proved="true">
-        <transf name="split_vc" proved="true" >
-         <goal name="delete_rec&#39;vc.86.1.2.0.0.0.0.0" expl="postcondition" proved="true">
-         <transf name="split_vc" proved="true" >
-          <goal name="delete_rec&#39;vc.86.1.2.0.0.0.0.0.0" expl="postcondition" proved="true">
-          <proof prover="6" timelimit="5"><result status="valid" time="0.877361" steps="2506807"/></proof>
-          </goal>
-         </transf>
-         </goal>
-        </transf>
-        </goal>
-       </transf>
-       </goal>
-      </transf>
+      <proof prover="0"><result status="valid" time="0.472542" steps="113016"/></proof>
       </goal>
       <goal name="delete_rec&#39;vc.86.1.2.0.1" expl="postcondition" proved="true">
-      <proof prover="6" timelimit="5"><result status="valid" time="0.451371" steps="1395545"/></proof>
+      <proof prover="2"><result status="valid" time="0.317340" steps="52375"/></proof>
       </goal>
      </transf>
      </goal>
      <goal name="delete_rec&#39;vc.86.1.2.1" expl="postcondition" proved="true">
-     <proof prover="6" timelimit="10" memlimit="2000"><result status="valid" time="1.624554" steps="5062306"/></proof>
+     <proof prover="2"><result status="valid" time="0.681307" steps="98987"/></proof>
      </goal>
      <goal name="delete_rec&#39;vc.86.1.2.2" expl="postcondition" proved="true">
      <transf name="split_vc" proved="true" >
@@ -3902,29 +2211,14 @@
        <goal name="delete_rec&#39;vc.86.1.2.2.0.0" expl="postcondition" proved="true">
        <transf name="split_vc" proved="true" >
         <goal name="delete_rec&#39;vc.86.1.2.2.0.0.0" expl="postcondition" proved="true">
-        <transf name="split_vc" proved="true" >
-         <goal name="delete_rec&#39;vc.86.1.2.2.0.0.0.0" expl="postcondition" proved="true">
-         <transf name="split_vc" proved="true" >
-          <goal name="delete_rec&#39;vc.86.1.2.2.0.0.0.0.0" expl="postcondition" proved="true">
-          <proof prover="6"><result status="valid" time="0.436120" steps="1536407"/></proof>
-          </goal>
-          <goal name="delete_rec&#39;vc.86.1.2.2.0.0.0.0.1" expl="postcondition" proved="true">
-          <proof prover="6"><result status="valid" time="0.037503" steps="133449"/></proof>
-          </goal>
-         </transf>
-         </goal>
-        </transf>
+        <proof prover="2"><result status="valid" time="0.793536" steps="116846"/></proof>
         </goal>
        </transf>
        </goal>
       </transf>
       </goal>
       <goal name="delete_rec&#39;vc.86.1.2.2.1" expl="postcondition" proved="true">
-      <transf name="split_vc" proved="true" >
-       <goal name="delete_rec&#39;vc.86.1.2.2.1.0" expl="postcondition" proved="true">
-       <proof prover="0" timelimit="5"><result status="valid" time="0.930262" steps="139310"/></proof>
-       </goal>
-      </transf>
+      <proof prover="6"><result status="valid" time="0.868277" steps="2050455"/></proof>
       </goal>
      </transf>
      </goal>
@@ -3935,20 +2229,12 @@
    <goal name="delete_rec&#39;vc.86.2" expl="postcondition" proved="true">
    <transf name="split_vc" proved="true" >
     <goal name="delete_rec&#39;vc.86.2.0" expl="postcondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="delete_rec&#39;vc.86.2.0.0" expl="postcondition" proved="true">
-     <transf name="split_vc" proved="true" >
-      <goal name="delete_rec&#39;vc.86.2.0.0.0" expl="postcondition" proved="true">
-      <proof prover="1"><result status="valid" time="0.044405" steps="364"/></proof>
-      </goal>
-     </transf>
-     </goal>
-    </transf>
+    <proof prover="2"><result status="valid" time="0.040144" steps="13193"/></proof>
     </goal>
     <goal name="delete_rec&#39;vc.86.2.1" expl="postcondition" proved="true">
     <transf name="split_vc" proved="true" >
      <goal name="delete_rec&#39;vc.86.2.1.0" expl="postcondition" proved="true">
-     <proof prover="1"><result status="valid" time="0.812079" steps="14453"/></proof>
+     <proof prover="1"><result status="valid" time="0.477821" steps="7134"/></proof>
      </goal>
     </transf>
     </goal>
@@ -3959,23 +2245,19 @@
       <goal name="delete_rec&#39;vc.86.2.2.0.0" expl="postcondition" proved="true">
       <transf name="split_vc" proved="true" >
        <goal name="delete_rec&#39;vc.86.2.2.0.0.0" expl="postcondition" proved="true">
-       <proof prover="6" timelimit="5"><result status="valid" time="0.814528" steps="2517486"/></proof>
+       <proof prover="0"><result status="valid" time="0.426328" steps="105281"/></proof>
        </goal>
       </transf>
       </goal>
       <goal name="delete_rec&#39;vc.86.2.2.0.1" expl="postcondition" proved="true">
-      <transf name="split_vc" proved="true" >
-       <goal name="delete_rec&#39;vc.86.2.2.0.1.0" expl="postcondition" proved="true">
-       <proof prover="0" timelimit="5"><result status="valid" time="0.287380" steps="45405"/></proof>
-       </goal>
-      </transf>
+      <proof prover="2"><result status="valid" time="0.475091" steps="77991"/></proof>
       </goal>
      </transf>
      </goal>
      <goal name="delete_rec&#39;vc.86.2.2.1" expl="postcondition" proved="true">
      <transf name="split_vc" proved="true" >
       <goal name="delete_rec&#39;vc.86.2.2.1.0" expl="postcondition" proved="true">
-      <proof prover="6"><result status="valid" time="0.187254" steps="649758"/></proof>
+      <proof prover="2"><result status="valid" time="0.416317" steps="88706"/></proof>
       </goal>
      </transf>
      </goal>
@@ -3984,16 +2266,12 @@
       <goal name="delete_rec&#39;vc.86.2.2.2.0" expl="postcondition" proved="true">
       <transf name="split_vc" proved="true" >
        <goal name="delete_rec&#39;vc.86.2.2.2.0.0" expl="postcondition" proved="true">
-       <proof prover="6"><result status="valid" time="0.462647" steps="1517735"/></proof>
+       <proof prover="6"><result status="valid" time="0.504166" steps="1517735"/></proof>
        </goal>
       </transf>
       </goal>
       <goal name="delete_rec&#39;vc.86.2.2.2.1" expl="postcondition" proved="true">
-      <transf name="split_vc" proved="true" >
-       <goal name="delete_rec&#39;vc.86.2.2.2.1.0" expl="postcondition" proved="true">
-       <proof prover="0"><result status="valid" time="0.900198" steps="138945"/></proof>
-       </goal>
-      </transf>
+      <proof prover="6"><result status="valid" time="0.660938" steps="1601014"/></proof>
       </goal>
      </transf>
      </goal>
@@ -4006,71 +2284,39 @@
   <goal name="delete_rec&#39;vc.87" expl="postcondition" proved="true">
   <transf name="split_vc" proved="true" >
    <goal name="delete_rec&#39;vc.87.0" expl="postcondition" proved="true">
-   <transf name="split_vc" proved="true" >
-    <goal name="delete_rec&#39;vc.87.0.0" expl="postcondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="delete_rec&#39;vc.87.0.0.0" expl="postcondition" proved="true">
-     <transf name="split_vc" proved="true" >
-      <goal name="delete_rec&#39;vc.87.0.0.0.0" expl="postcondition" proved="true">
-      <proof prover="1" timelimit="5"><result status="valid" time="0.067101" steps="856"/></proof>
-      </goal>
-     </transf>
-     </goal>
-    </transf>
-    </goal>
-   </transf>
+   <proof prover="1"><result status="valid" time="0.075014" steps="857"/></proof>
    </goal>
    <goal name="delete_rec&#39;vc.87.1" expl="postcondition" proved="true">
-   <proof prover="2"><result status="valid" time="0.142624" steps="38485"/></proof>
+   <proof prover="2"><result status="valid" time="0.198101" steps="38485"/></proof>
    </goal>
    <goal name="delete_rec&#39;vc.87.2" expl="postcondition" proved="true">
    <transf name="split_vc" proved="true" >
     <goal name="delete_rec&#39;vc.87.2.0" expl="postcondition" proved="true">
     <transf name="split_vc" proved="true" >
      <goal name="delete_rec&#39;vc.87.2.0.0" expl="postcondition" proved="true">
-     <transf name="split_vc" proved="true" >
-      <goal name="delete_rec&#39;vc.87.2.0.0.0" expl="postcondition" proved="true">
-      <proof prover="2"><result status="valid" time="0.237952" steps="34332"/></proof>
-      </goal>
-     </transf>
+     <proof prover="2"><result status="valid" time="0.605141" steps="72928"/></proof>
      </goal>
      <goal name="delete_rec&#39;vc.87.2.0.1" expl="postcondition" proved="true">
-     <transf name="split_vc" proved="true" >
-      <goal name="delete_rec&#39;vc.87.2.0.1.0" expl="postcondition" proved="true">
-      <proof prover="2"><result status="valid" time="0.229612" steps="29865"/></proof>
-      </goal>
-     </transf>
+     <proof prover="2"><result status="valid" time="0.499758" steps="67618"/></proof>
      </goal>
     </transf>
     </goal>
     <goal name="delete_rec&#39;vc.87.2.1" expl="postcondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="delete_rec&#39;vc.87.2.1.0" expl="postcondition" proved="true">
-     <transf name="split_vc" proved="true" >
-      <goal name="delete_rec&#39;vc.87.2.1.0.0" expl="postcondition" proved="true">
-      <transf name="split_vc" proved="true" >
-       <goal name="delete_rec&#39;vc.87.2.1.0.0.0" expl="postcondition" proved="true">
-       <proof prover="0" timelimit="5"><result status="valid" time="3.187892" steps="509310"/></proof>
-       </goal>
-      </transf>
-      </goal>
-     </transf>
-     </goal>
-    </transf>
+    <proof prover="2"><result status="valid" time="0.481771" steps="82273"/></proof>
     </goal>
     <goal name="delete_rec&#39;vc.87.2.2" expl="postcondition" proved="true">
     <transf name="split_vc" proved="true" >
      <goal name="delete_rec&#39;vc.87.2.2.0" expl="postcondition" proved="true">
      <transf name="split_vc" proved="true" >
       <goal name="delete_rec&#39;vc.87.2.2.0.0" expl="postcondition" proved="true">
-      <proof prover="2"><result status="valid" time="0.508643" steps="47868"/></proof>
+      <proof prover="2"><result status="valid" time="0.371760" steps="47928"/></proof>
       </goal>
      </transf>
      </goal>
      <goal name="delete_rec&#39;vc.87.2.2.1" expl="postcondition" proved="true">
      <transf name="split_vc" proved="true" >
       <goal name="delete_rec&#39;vc.87.2.2.1.0" expl="postcondition" proved="true">
-      <proof prover="2"><result status="valid" time="0.492099" steps="46633"/></proof>
+      <proof prover="2"><result status="valid" time="0.345564" steps="46633"/></proof>
       </goal>
      </transf>
      </goal>
@@ -4083,48 +2329,28 @@
   <goal name="delete_rec&#39;vc.88" expl="postcondition" proved="true">
   <transf name="split_vc" proved="true" >
    <goal name="delete_rec&#39;vc.88.0" expl="postcondition" proved="true">
-   <transf name="split_vc" proved="true" >
-    <goal name="delete_rec&#39;vc.88.0.0" expl="postcondition" proved="true">
-    <proof prover="1"><result status="valid" time="0.039032" steps="372"/></proof>
-    </goal>
-   </transf>
+   <proof prover="2"><result status="valid" time="0.039752" steps="13030"/></proof>
    </goal>
    <goal name="delete_rec&#39;vc.88.1" expl="postcondition" proved="true">
-   <proof prover="2"><result status="valid" time="0.123805" steps="35001"/></proof>
+   <proof prover="2"><result status="valid" time="0.172148" steps="35001"/></proof>
    </goal>
    <goal name="delete_rec&#39;vc.88.2" expl="postcondition" proved="true">
    <transf name="split_vc" proved="true" >
     <goal name="delete_rec&#39;vc.88.2.0" expl="postcondition" proved="true">
-    <proof prover="2"><result status="valid" time="0.561668" steps="90793"/></proof>
+    <proof prover="2"><result status="valid" time="0.407766" steps="90793"/></proof>
     </goal>
     <goal name="delete_rec&#39;vc.88.2.1" expl="postcondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="delete_rec&#39;vc.88.2.1.0" expl="postcondition" proved="true">
-     <transf name="split_vc" proved="true" >
-      <goal name="delete_rec&#39;vc.88.2.1.0.0" expl="postcondition" proved="true">
-      <transf name="split_vc" proved="true" >
-       <goal name="delete_rec&#39;vc.88.2.1.0.0.0" expl="postcondition" proved="true">
-       <transf name="split_vc" proved="true" >
-        <goal name="delete_rec&#39;vc.88.2.1.0.0.0.0" expl="postcondition" proved="true">
-        <proof prover="2"><result status="valid" time="0.157799" steps="43575"/></proof>
-        </goal>
-       </transf>
-       </goal>
-      </transf>
-      </goal>
-     </transf>
-     </goal>
-    </transf>
+    <proof prover="2"><result status="valid" time="0.382480" steps="64109"/></proof>
     </goal>
     <goal name="delete_rec&#39;vc.88.2.2" expl="postcondition" proved="true">
-    <proof prover="2"><result status="valid" time="1.083711" steps="94423"/></proof>
+    <proof prover="2"><result status="valid" time="0.848125" steps="94423"/></proof>
     </goal>
    </transf>
    </goal>
   </transf>
   </goal>
   <goal name="delete_rec&#39;vc.89" expl="postcondition" proved="true">
-  <proof prover="6"><result status="valid" time="0.061827" steps="167881"/></proof>
+  <proof prover="2"><result status="valid" time="0.205207" steps="96284"/></proof>
   </goal>
  </transf>
  </goal>
@@ -4133,190 +2359,90 @@
  <goal name="delete&#39;vc" expl="VC for delete" proved="true">
  <transf name="split_vc" proved="true" >
   <goal name="delete&#39;vc.0" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.013712" steps="50"/></proof>
+  <proof prover="2"><result status="valid" time="0.029584" steps="8453"/></proof>
   </goal>
   <goal name="delete&#39;vc.1" expl="type invariant" proved="true">
-  <proof prover="6"><result status="valid" time="0.022679" steps="54376"/></proof>
+  <proof prover="2"><result status="valid" time="0.024435" steps="8488"/></proof>
   </goal>
   <goal name="delete&#39;vc.2" expl="type invariant" proved="true">
-  <proof prover="1"><result status="valid" time="0.015600" steps="64"/></proof>
+  <proof prover="2"><result status="valid" time="0.030955" steps="8583"/></proof>
   </goal>
   <goal name="delete&#39;vc.3" expl="type invariant" proved="true">
-  <proof prover="1"><result status="valid" time="0.013738" steps="54"/></proof>
+  <proof prover="2"><result status="valid" time="0.035432" steps="8492"/></proof>
   </goal>
   <goal name="delete&#39;vc.4" expl="type invariant" proved="true">
-  <proof prover="2"><result status="valid" time="0.035978" steps="8586"/></proof>
+  <proof prover="2"><result status="valid" time="0.035931" steps="8586"/></proof>
   </goal>
   <goal name="delete&#39;vc.5" expl="unreachable point" proved="true">
-  <proof prover="1"><result status="valid" time="0.016782" steps="45"/></proof>
+  <proof prover="2"><result status="valid" time="0.030891" steps="8223"/></proof>
   </goal>
   <goal name="delete&#39;vc.6" expl="type invariant" proved="true">
-  <proof prover="1"><result status="valid" time="0.013091" steps="40"/></proof>
+  <proof prover="2"><result status="valid" time="0.027181" steps="8347"/></proof>
   </goal>
   <goal name="delete&#39;vc.7" expl="type invariant" proved="true">
-  <proof prover="1"><result status="valid" time="0.010164" steps="42"/></proof>
+  <proof prover="2"><result status="valid" time="0.018891" steps="7991"/></proof>
   </goal>
   <goal name="delete&#39;vc.8" expl="type invariant" proved="true">
-  <proof prover="1"><result status="valid" time="0.015249" steps="48"/></proof>
+  <proof prover="2"><result status="valid" time="0.030120" steps="8723"/></proof>
   </goal>
   <goal name="delete&#39;vc.9" expl="type invariant" proved="true">
-  <proof prover="1"><result status="valid" time="0.014343" steps="36"/></proof>
+  <proof prover="2"><result status="valid" time="0.018348" steps="7735"/></proof>
   </goal>
   <goal name="delete&#39;vc.10" expl="precondition" proved="true">
-  <proof prover="6" timelimit="5"><result status="valid" time="0.392310" steps="1641312"/></proof>
+  <proof prover="2"><result status="valid" time="0.093328" steps="17167"/></proof>
   </goal>
   <goal name="delete&#39;vc.11" expl="precondition" proved="true">
-  <proof prover="2"><result status="valid" time="0.139879" steps="21798"/></proof>
+  <proof prover="2"><result status="valid" time="0.098374" steps="21587"/></proof>
   </goal>
   <goal name="delete&#39;vc.12" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.021108" steps="43"/></proof>
+  <proof prover="2"><result status="valid" time="0.029515" steps="9619"/></proof>
   </goal>
   <goal name="delete&#39;vc.13" expl="precondition" proved="true">
-  <proof prover="6"><result status="valid" time="0.012670" steps="4990"/></proof>
+  <proof prover="2"><result status="valid" time="0.025534" steps="8293"/></proof>
   </goal>
   <goal name="delete&#39;vc.14" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.018357" steps="50"/></proof>
+  <proof prover="2"><result status="valid" time="0.028346" steps="9691"/></proof>
   </goal>
   <goal name="delete&#39;vc.15" expl="type invariant" proved="true">
-  <proof prover="2"><result status="valid" time="0.042472" steps="9798"/></proof>
+  <proof prover="2"><result status="valid" time="0.038996" steps="9798"/></proof>
   </goal>
   <goal name="delete&#39;vc.16" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.021574" steps="66"/></proof>
+  <proof prover="2"><result status="valid" time="0.030351" steps="9971"/></proof>
   </goal>
   <goal name="delete&#39;vc.17" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.038904" steps="467"/></proof>
+  <proof prover="2"><result status="valid" time="0.060949" steps="14618"/></proof>
   </goal>
   <goal name="delete&#39;vc.18" expl="precondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.015483" steps="70"/></proof>
+  <proof prover="2"><result status="valid" time="0.022712" steps="8743"/></proof>
   </goal>
   <goal name="delete&#39;vc.19" expl="type invariant" proved="true">
-  <proof prover="2"><result status="valid" time="0.037429" steps="10671"/></proof>
+  <proof prover="2"><result status="valid" time="0.032155" steps="10671"/></proof>
   </goal>
   <goal name="delete&#39;vc.20" expl="type invariant" proved="true">
-  <proof prover="1"><result status="valid" time="0.026452" steps="82"/></proof>
+  <proof prover="2"><result status="valid" time="0.032537" steps="10713"/></proof>
   </goal>
   <goal name="delete&#39;vc.21" expl="postcondition" proved="true">
-  <proof prover="2"><result status="valid" time="0.142745" steps="36690"/></proof>
+  <proof prover="2"><result status="valid" time="0.164595" steps="36700"/></proof>
   </goal>
   <goal name="delete&#39;vc.22" expl="postcondition" proved="true">
-  <transf name="split_vc" proved="true" >
-   <goal name="delete&#39;vc.22.0" expl="postcondition" proved="true">
-   <proof prover="6"><result status="valid" time="0.201149" steps="394410"/></proof>
-   </goal>
-   <goal name="delete&#39;vc.22.1" expl="postcondition" proved="true">
-   <transf name="split_vc" proved="true" >
-    <goal name="delete&#39;vc.22.1.0" expl="postcondition" proved="true">
-    <proof prover="0"><result status="valid" time="0.165607" steps="17634"/></proof>
-    </goal>
-    <goal name="delete&#39;vc.22.1.1" expl="postcondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="delete&#39;vc.22.1.1.0" expl="postcondition" proved="true">
-     <transf name="split_vc" proved="true" >
-      <goal name="delete&#39;vc.22.1.1.0.0" expl="postcondition" proved="true">
-      <proof prover="0"><result status="valid" time="0.313123" steps="30570"/></proof>
-      </goal>
-     </transf>
-     </goal>
-     <goal name="delete&#39;vc.22.1.1.1" expl="postcondition" proved="true">
-     <transf name="split_vc" proved="true" >
-      <goal name="delete&#39;vc.22.1.1.1.0" expl="postcondition" proved="true">
-      <proof prover="0"><result status="valid" time="0.331690" steps="44517"/></proof>
-      </goal>
-     </transf>
-     </goal>
-    </transf>
-    </goal>
-   </transf>
-   </goal>
-   <goal name="delete&#39;vc.22.2" expl="postcondition" proved="true">
-   <transf name="split_vc" proved="true" >
-    <goal name="delete&#39;vc.22.2.0" expl="postcondition" proved="true">
-    <proof prover="0"><result status="valid" time="0.168414" steps="17080"/></proof>
-    </goal>
-    <goal name="delete&#39;vc.22.2.1" expl="postcondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="delete&#39;vc.22.2.1.0" expl="postcondition" proved="true">
-     <transf name="split_vc" proved="true" >
-      <goal name="delete&#39;vc.22.2.1.0.0" expl="postcondition" proved="true">
-      <proof prover="0"><result status="valid" time="0.178093" steps="24963"/></proof>
-      </goal>
-     </transf>
-     </goal>
-     <goal name="delete&#39;vc.22.2.1.1" expl="postcondition" proved="true">
-     <transf name="split_vc" proved="true" >
-      <goal name="delete&#39;vc.22.2.1.1.0" expl="postcondition" proved="true">
-      <proof prover="0"><result status="valid" time="0.233699" steps="33854"/></proof>
-      </goal>
-     </transf>
-     </goal>
-    </transf>
-    </goal>
-   </transf>
-   </goal>
-  </transf>
+  <proof prover="2"><result status="valid" time="0.542165" steps="102183"/></proof>
   </goal>
   <goal name="delete&#39;vc.23" expl="postcondition" proved="true">
   <transf name="split_vc" proved="true" >
    <goal name="delete&#39;vc.23.0" expl="postcondition" proved="true">
-   <transf name="split_vc" proved="true" >
-    <goal name="delete&#39;vc.23.0.0" expl="postcondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="delete&#39;vc.23.0.0.0" expl="postcondition" proved="true">
-     <transf name="split_vc" proved="true" >
-      <goal name="delete&#39;vc.23.0.0.0.0" expl="postcondition" proved="true">
-      <transf name="split_vc" proved="true" >
-       <goal name="delete&#39;vc.23.0.0.0.0.0" expl="postcondition" proved="true">
-       <proof prover="2"><result status="valid" time="0.046325" steps="9589"/></proof>
-       </goal>
-      </transf>
-      </goal>
-     </transf>
-     </goal>
-    </transf>
-    </goal>
-   </transf>
+   <proof prover="2"><result status="valid" time="0.039632" steps="10373"/></proof>
    </goal>
    <goal name="delete&#39;vc.23.1" expl="postcondition" proved="true">
    <transf name="split_vc" proved="true" >
     <goal name="delete&#39;vc.23.1.0" expl="postcondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="delete&#39;vc.23.1.0.0" expl="postcondition" proved="true">
-     <transf name="split_vc" proved="true" >
-      <goal name="delete&#39;vc.23.1.0.0.0" expl="postcondition" proved="true">
-      <transf name="split_vc" proved="true" >
-       <goal name="delete&#39;vc.23.1.0.0.0.0" expl="postcondition" proved="true">
-       <proof prover="0" timelimit="5"><result status="valid" time="0.527717" steps="65268"/></proof>
-       </goal>
-       <goal name="delete&#39;vc.23.1.0.0.0.1" expl="postcondition" proved="true">
-       <proof prover="0"><result status="valid" time="0.187400" steps="35445"/></proof>
-       </goal>
-      </transf>
-      </goal>
-     </transf>
-     </goal>
-    </transf>
+    <proof prover="2"><result status="valid" time="0.646294" steps="141647"/></proof>
     </goal>
     <goal name="delete&#39;vc.23.1.1" expl="postcondition" proved="true">
     <transf name="split_vc" proved="true" >
      <goal name="delete&#39;vc.23.1.1.0" expl="postcondition" proved="true">
      <transf name="split_vc" proved="true" >
       <goal name="delete&#39;vc.23.1.1.0.0" expl="postcondition" proved="true">
-      <transf name="split_vc" proved="true" >
-       <goal name="delete&#39;vc.23.1.1.0.0.0" expl="postcondition" proved="true">
-       <transf name="inline_goal" proved="true" >
-        <goal name="delete&#39;vc.23.1.1.0.0.0.0" expl="postcondition" proved="true">
-        <transf name="split_all_full" proved="true" >
-         <goal name="delete&#39;vc.23.1.1.0.0.0.0.0" expl="postcondition" proved="true">
-         <proof prover="0" timelimit="5"><result status="valid" time="0.893944" steps="244905"/></proof>
-         </goal>
-        </transf>
-        </goal>
-       </transf>
-       </goal>
-       <goal name="delete&#39;vc.23.1.1.0.0.1" expl="postcondition" proved="true">
-       <proof prover="1"><result status="valid" time="0.026124" steps="197"/></proof>
-       </goal>
-      </transf>
+      <proof prover="0"><result status="valid" time="0.467472" steps="119446"/></proof>
       </goal>
      </transf>
      </goal>
@@ -4327,164 +2453,138 @@
   </transf>
   </goal>
   <goal name="delete&#39;vc.24" expl="postcondition" proved="true">
-  <proof prover="1"><result status="valid" time="0.017090" steps="34"/></proof>
+  <proof prover="2"><result status="valid" time="0.048146" steps="17658"/></proof>
   </goal>
  </transf>
  </goal>
 </theory>
 <theory name="RedBlackTree_Impl15_Get" proved="true">
  <goal name="get&#39;vc" expl="VC for get" proved="true">
- <proof prover="1"><result status="valid" time="0.245929" steps="2906"/></proof>
+ <proof prover="1"><result status="valid" time="0.261182" steps="4176"/></proof>
  </goal>
 </theory>
 <theory name="RedBlackTree_Impl15_GetMut" proved="true">
  <goal name="get_mut&#39;vc" expl="VC for get_mut" proved="true">
  <transf name="split_vc" proved="true" >
   <goal name="get_mut&#39;vc.0" expl="type invariant" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.011300" steps="32"/></proof>
+  <proof prover="2"><result status="valid" time="0.030718" steps="8794"/></proof>
   </goal>
   <goal name="get_mut&#39;vc.1" expl="loop invariant init" proved="true">
-  <proof prover="1"><result status="valid" time="0.011215" steps="55"/></proof>
+  <proof prover="2"><result status="valid" time="0.031316" steps="9173"/></proof>
   </goal>
   <goal name="get_mut&#39;vc.2" expl="loop invariant init" proved="true">
-  <proof prover="1"><result status="valid" time="0.014060" steps="40"/></proof>
+  <proof prover="2"><result status="valid" time="0.030530" steps="9177"/></proof>
   </goal>
   <goal name="get_mut&#39;vc.3" expl="loop invariant init" proved="true">
-  <proof prover="1"><result status="valid" time="0.010761" steps="42"/></proof>
+  <proof prover="2"><result status="valid" time="0.032080" steps="8866"/></proof>
   </goal>
   <goal name="get_mut&#39;vc.4" expl="loop invariant init" proved="true">
-  <proof prover="1"><result status="valid" time="0.015646" steps="57"/></proof>
+  <proof prover="2"><result status="valid" time="0.028473" steps="8770"/></proof>
   </goal>
   <goal name="get_mut&#39;vc.5" expl="loop invariant init" proved="true">
-  <proof prover="1"><result status="valid" time="0.014733" steps="57"/></proof>
+  <proof prover="2"><result status="valid" time="0.027843" steps="8841"/></proof>
   </goal>
   <goal name="get_mut&#39;vc.6" expl="loop invariant init" proved="true">
-  <proof prover="1"><result status="valid" time="0.012201" steps="46"/></proof>
+  <proof prover="2"><result status="valid" time="0.025471" steps="8880"/></proof>
   </goal>
   <goal name="get_mut&#39;vc.7" expl="loop invariant init" proved="true">
-  <proof prover="1"><result status="valid" time="0.018776" steps="49"/></proof>
+  <proof prover="2"><result status="valid" time="0.025250" steps="9087"/></proof>
   </goal>
   <goal name="get_mut&#39;vc.8" expl="loop invariant init" proved="true">
-  <proof prover="1"><result status="valid" time="0.014799" steps="51"/></proof>
+  <proof prover="2"><result status="valid" time="0.035279" steps="9731"/></proof>
   </goal>
   <goal name="get_mut&#39;vc.9" expl="loop invariant init" proved="true">
-  <proof prover="1"><result status="valid" time="0.013769" steps="94"/></proof>
+  <proof prover="2"><result status="valid" time="0.033848" steps="9900"/></proof>
   </goal>
   <goal name="get_mut&#39;vc.10" expl="type invariant" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.013296" steps="71"/></proof>
+  <proof prover="2"><result status="valid" time="0.037679" steps="9529"/></proof>
   </goal>
   <goal name="get_mut&#39;vc.11" expl="precondition" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.015578" steps="70"/></proof>
+  <proof prover="2"><result status="valid" time="0.024764" steps="8805"/></proof>
   </goal>
   <goal name="get_mut&#39;vc.12" expl="precondition" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.012141" steps="70"/></proof>
+  <proof prover="2"><result status="valid" time="0.020608" steps="8806"/></proof>
   </goal>
   <goal name="get_mut&#39;vc.13" expl="type invariant" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.013019" steps="95"/></proof>
+  <proof prover="2"><result status="valid" time="0.029162" steps="9494"/></proof>
   </goal>
   <goal name="get_mut&#39;vc.14" expl="type invariant" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.015499" steps="101"/></proof>
+  <proof prover="2"><result status="valid" time="0.033111" steps="9636"/></proof>
   </goal>
   <goal name="get_mut&#39;vc.15" expl="type invariant" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.017518" steps="74"/></proof>
+  <proof prover="2"><result status="valid" time="0.019119" steps="8828"/></proof>
   </goal>
   <goal name="get_mut&#39;vc.16" expl="type invariant" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.019725" steps="99"/></proof>
+  <proof prover="2"><result status="valid" time="0.028764" steps="10087"/></proof>
   </goal>
   <goal name="get_mut&#39;vc.17" expl="type invariant" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.013869" steps="103"/></proof>
+  <proof prover="2"><result status="valid" time="0.027807" steps="10182"/></proof>
   </goal>
   <goal name="get_mut&#39;vc.18" expl="type invariant" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.017173" steps="107"/></proof>
+  <proof prover="2"><result status="valid" time="0.028173" steps="10277"/></proof>
   </goal>
   <goal name="get_mut&#39;vc.19" expl="type invariant" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.016574" steps="95"/></proof>
+  <proof prover="2"><result status="valid" time="0.028988" steps="9494"/></proof>
   </goal>
   <goal name="get_mut&#39;vc.20" expl="type invariant" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.016982" steps="101"/></proof>
+  <proof prover="2"><result status="valid" time="0.025537" steps="9636"/></proof>
   </goal>
   <goal name="get_mut&#39;vc.21" expl="unreachable point" proved="true">
-  <proof prover="1"><result status="valid" time="0.015250" steps="63"/></proof>
+  <proof prover="2"><result status="valid" time="0.026184" steps="9093"/></proof>
   </goal>
   <goal name="get_mut&#39;vc.22" expl="type invariant" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.016907" steps="59"/></proof>
+  <proof prover="2"><result status="valid" time="0.027816" steps="9398"/></proof>
   </goal>
   <goal name="get_mut&#39;vc.23" expl="type invariant" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.009757" steps="58"/></proof>
+  <proof prover="2"><result status="valid" time="0.014394" steps="8703"/></proof>
   </goal>
   <goal name="get_mut&#39;vc.24" expl="type invariant" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.021941" steps="51"/></proof>
+  <proof prover="2"><result status="valid" time="0.032045" steps="10047"/></proof>
   </goal>
   <goal name="get_mut&#39;vc.25" expl="type invariant" proved="true">
-  <proof prover="1"><result status="valid" time="0.014165" steps="55"/></proof>
+  <proof prover="2"><result status="valid" time="0.027122" steps="10136"/></proof>
   </goal>
   <goal name="get_mut&#39;vc.26" expl="loop invariant preservation" proved="true">
-  <transf name="split_vc" proved="true" >
-   <goal name="get_mut&#39;vc.26.0" expl="loop invariant preservation" proved="true">
-   <transf name="split_vc" proved="true" >
-    <goal name="get_mut&#39;vc.26.0.0" expl="loop invariant preservation" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="get_mut&#39;vc.26.0.0.0" expl="loop invariant preservation" proved="true">
-     <proof prover="2"><result status="valid" time="0.042522" steps="14897"/></proof>
-     </goal>
-     <goal name="get_mut&#39;vc.26.0.0.1" expl="loop invariant preservation" proved="true">
-     <proof prover="2"><result status="valid" time="0.072420" steps="14939"/></proof>
-     </goal>
-    </transf>
-    </goal>
-   </transf>
-   </goal>
-  </transf>
+  <proof prover="2"><result status="valid" time="0.138116" steps="23334"/></proof>
   </goal>
   <goal name="get_mut&#39;vc.27" expl="loop invariant preservation" proved="true">
-  <proof prover="2"><result status="valid" time="0.092051" steps="23494"/></proof>
+  <proof prover="2"><result status="valid" time="0.128519" steps="23494"/></proof>
   </goal>
   <goal name="get_mut&#39;vc.28" expl="loop invariant preservation" proved="true">
-  <proof prover="2"><result status="valid" time="0.070817" steps="23617"/></proof>
+  <proof prover="2"><result status="valid" time="0.090985" steps="23617"/></proof>
   </goal>
   <goal name="get_mut&#39;vc.29" expl="loop invariant preservation" proved="true">
-  <proof prover="2"><result status="valid" time="0.243084" steps="35265"/></proof>
+  <proof prover="2"><result status="valid" time="0.172471" steps="35265"/></proof>
   </goal>
   <goal name="get_mut&#39;vc.30" expl="loop invariant preservation" proved="true">
-  <proof prover="2"><result status="valid" time="0.339225" steps="35480"/></proof>
+  <proof prover="2"><result status="valid" time="0.170056" steps="35480"/></proof>
   </goal>
   <goal name="get_mut&#39;vc.31" expl="loop invariant preservation" proved="true">
   <transf name="split_vc" proved="true" >
    <goal name="get_mut&#39;vc.31.0" expl="loop invariant preservation" proved="true">
-   <proof prover="2"><result status="valid" time="0.558851" steps="74142"/></proof>
+   <proof prover="2"><result status="valid" time="0.396736" steps="74142"/></proof>
    </goal>
   </transf>
   </goal>
   <goal name="get_mut&#39;vc.32" expl="loop invariant preservation" proved="true">
-  <proof prover="2"><result status="valid" time="0.153841" steps="27061"/></proof>
+  <proof prover="2"><result status="valid" time="0.118857" steps="27061"/></proof>
   </goal>
   <goal name="get_mut&#39;vc.33" expl="loop invariant preservation" proved="true">
-  <proof prover="2"><result status="valid" time="0.363031" steps="43568"/></proof>
+  <proof prover="2"><result status="valid" time="0.227821" steps="43568"/></proof>
   </goal>
   <goal name="get_mut&#39;vc.34" expl="loop invariant preservation" proved="true">
-  <proof prover="2"><result status="valid" time="0.148757" steps="37027"/></proof>
+  <proof prover="2"><result status="valid" time="0.183795" steps="37027"/></proof>
   </goal>
   <goal name="get_mut&#39;vc.35" expl="type invariant" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.017748" steps="51"/></proof>
+  <proof prover="2"><result status="valid" time="0.037251" steps="10729"/></proof>
   </goal>
   <goal name="get_mut&#39;vc.36" expl="postcondition" proved="true">
-  <proof prover="2"><result status="valid" time="0.241139" steps="38614"/></proof>
+  <proof prover="2"><result status="valid" time="0.232711" steps="38614"/></proof>
   </goal>
   <goal name="get_mut&#39;vc.37" expl="postcondition" proved="true">
   <transf name="split_vc" proved="true" >
    <goal name="get_mut&#39;vc.37.0" expl="postcondition" proved="true">
-   <transf name="split_vc" proved="true" >
-    <goal name="get_mut&#39;vc.37.0.0" expl="postcondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="get_mut&#39;vc.37.0.0.0" expl="postcondition" proved="true">
-     <proof prover="1"><result status="valid" time="0.318508" steps="5975"/></proof>
-     </goal>
-    </transf>
-    </goal>
-    <goal name="get_mut&#39;vc.37.0.1" expl="postcondition" proved="true">
-    <proof prover="2"><result status="valid" time="0.015235" steps="8967"/></proof>
-    </goal>
-   </transf>
+   <proof prover="1"><result status="valid" time="0.306050" steps="3206"/></proof>
    </goal>
    <goal name="get_mut&#39;vc.37.1" expl="postcondition" proved="true">
    <transf name="split_vc" proved="true" >
@@ -4495,7 +2595,7 @@
       <goal name="get_mut&#39;vc.37.1.0.0.0" expl="postcondition" proved="true">
       <transf name="split_vc" proved="true" >
        <goal name="get_mut&#39;vc.37.1.0.0.0.0" expl="postcondition" proved="true">
-       <proof prover="1"><result status="valid" time="0.482334" steps="9763"/></proof>
+       <proof prover="1"><result status="valid" time="0.917721" steps="12716"/></proof>
        </goal>
       </transf>
       </goal>
@@ -4504,46 +2604,27 @@
     </transf>
     </goal>
     <goal name="get_mut&#39;vc.37.1.1" expl="postcondition" proved="true">
-    <proof prover="6"><result status="valid" time="0.012830" steps="7042"/></proof>
+    <proof prover="2"><result status="valid" time="0.015028" steps="8979"/></proof>
     </goal>
    </transf>
    </goal>
    <goal name="get_mut&#39;vc.37.2" expl="postcondition" proved="true">
-   <proof prover="1"><result status="valid" time="0.508359" steps="4837"/></proof>
+   <proof prover="2"><result status="valid" time="0.095022" steps="23859"/></proof>
    </goal>
    <goal name="get_mut&#39;vc.37.3" expl="postcondition" proved="true">
-   <transf name="split_vc" proved="true" >
-    <goal name="get_mut&#39;vc.37.3.0" expl="postcondition" proved="true">
-    <proof prover="2"><result status="valid" time="0.015380" steps="8837"/></proof>
-    </goal>
-    <goal name="get_mut&#39;vc.37.3.1" expl="postcondition" proved="true">
-    <transf name="split_vc" proved="true" >
-     <goal name="get_mut&#39;vc.37.3.1.0" expl="postcondition" proved="true">
-     <transf name="split_vc" proved="true" >
-      <goal name="get_mut&#39;vc.37.3.1.0.0" expl="postcondition" proved="true">
-      <transf name="split_vc" proved="true" >
-       <goal name="get_mut&#39;vc.37.3.1.0.0.0" expl="postcondition" proved="true">
-       <proof prover="1" timelimit="5"><result status="valid" time="0.042038" steps="711"/></proof>
-       </goal>
-      </transf>
-      </goal>
-     </transf>
-     </goal>
-    </transf>
-    </goal>
-   </transf>
+   <proof prover="2"><result status="valid" time="0.198358" steps="48985"/></proof>
    </goal>
   </transf>
   </goal>
   <goal name="get_mut&#39;vc.38" expl="postcondition" proved="true">
-  <proof prover="1" timelimit="5"><result status="valid" time="0.017545" steps="58"/></proof>
+  <proof prover="2"><result status="valid" time="0.033672" steps="10999"/></proof>
   </goal>
  </transf>
  </goal>
 </theory>
 <theory name="RedBlackTree_Impl16" proved="true">
  <goal name="clone&#39;_refn" proved="true">
- <proof prover="1"><result status="valid" time="0.013119" steps="10"/></proof>
+ <proof prover="2"><result status="valid" time="0.008490" steps="195"/></proof>
  </goal>
 </theory>
 </file>
diff --git a/creusot/tests/should_succeed/red_black_tree/why3shapes.gz b/creusot/tests/should_succeed/red_black_tree/why3shapes.gz
index ca8a8e6cf..c4f27b586 100644
Binary files a/creusot/tests/should_succeed/red_black_tree/why3shapes.gz and b/creusot/tests/should_succeed/red_black_tree/why3shapes.gz differ