diff --git a/resources/images/tour/collections-mutable-diagram.dot b/resources/images/tour/collections-mutable-diagram.dot
index 20058a973d..03d032eadf 100644
--- a/resources/images/tour/collections-mutable-diagram.dot
+++ b/resources/images/tour/collections-mutable-diagram.dot
@@ -18,6 +18,7 @@ digraph MutableCollections {
   WeakHashMap [color="#4A5659"];
   LinkedHashMap [color="#4A5659"];
   ListMap [color="#4A5659"];
+  TreeMap [color="#4A5659"];
   ImmutableMapAdaptor [color="#4A5659"];
   ArraySeq [color="#4A5659"];
   ArrayBuffer [color="#4A5659"];
@@ -37,6 +38,7 @@ digraph MutableCollections {
   Iterable -> Map;
   Iterable -> Seq [penwidth="4"];
   Iterable -> Set;
+  Iterable -> PriorityQueue;
   Map -> HashMap [penwidth="4"];
   Map -> WeakHashMap;
   Map -> OpenHashMap;
@@ -44,6 +46,7 @@ digraph MutableCollections {
   Map -> ObservableMap;
   Map -> SynchronizedMap;
   Map -> ImmutableMapAdaptor;
+  Map -> TreeMap;
   Map -> ListMap;
   Map -> MultiMap;
   Set -> HashSet [penwidth="4"];
@@ -57,7 +60,6 @@ digraph MutableCollections {
   Seq -> IndexedSeq [penwidth="4"];
   Seq -> Buffer;
   Seq -> Stack;
-  Seq -> PriorityQueue;
   Seq -> ArrayStack;
   LinearSeq -> MutableList [penwidth="4"];
   LinearSeq -> LinkedList;
@@ -74,6 +76,10 @@ digraph MutableCollections {
   MutableList -> Queue;
   Queue -> SynchronizedQueue;
 
+  {rank=same;
+    Iterable;
+    PriorityQueue;
+    SynchronizedPriorityQueue}
   {rank=same;
     Map;
     Set}
@@ -81,6 +87,7 @@ digraph MutableCollections {
     WeakHashMap;
     LinkedHashMap;
     ListMap;
+    ObservableMap;
     ImmutableMapAdaptor;
     BitSet;
     LinkedHashSet;
@@ -89,7 +96,6 @@ digraph MutableCollections {
   {rank=same;
     HashMap;
     OpenHashMap;
-    ObservableMap;
     SynchronizedMap;
     MultiMap;
     HashSet;
@@ -100,14 +106,12 @@ digraph MutableCollections {
     Buffer;
     LinearSeq;
     Stack;
-    PriorityQueue;
     ArrayStack}
   {rank=same;
     ArraySeq;
     ArrayBuffer;
     SynchronizedBuffer;
     SynchronizedStack;
-    SynchronizedPriorityQueue;
     MutableList;
     LinkedList}
   {rank=same;
@@ -116,6 +120,4 @@ digraph MutableCollections {
     ListBuffer;
     Queue;
     DoubleLinkedList}
-  {rank=same;
-    SynchronizedQueue}
 }
diff --git a/resources/images/tour/collections-mutable-diagram.svg b/resources/images/tour/collections-mutable-diagram.svg
index 8b59edd5c6..a4e7ff4630 100644
--- a/resources/images/tour/collections-mutable-diagram.svg
+++ b/resources/images/tour/collections-mutable-diagram.svg
@@ -4,11 +4,11 @@
 <!-- Generated by graphviz version 2.38.0 (20140413.2041)
  -->
 <!-- Title: MutableCollections Pages: 1 -->
-<svg width="1367pt" height="620pt"
- viewBox="0.00 0.00 1366.50 620.00" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+<svg width="1309pt" height="620pt"
+ viewBox="0.00 0.00 1308.50 620.00" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
 <g id="graph0" class="graph" transform="scale(1 1) rotate(0) translate(4 616)">
 <title>MutableCollections</title>
-<polygon fill="white" stroke="none" points="-4,4 -4,-616 1362.5,-616 1362.5,4 -4,4"/>
+<polygon fill="white" stroke="none" points="-4,4 -4,-616 1304.5,-616 1304.5,4 -4,4"/>
 <!-- HashSet -->
 <g id="node1" class="node"><title>HashSet</title>
 <path fill="#4a5659" stroke="#4a5659" d="M834,-396C834,-396 795,-396 795,-396 789,-396 783,-390 783,-384 783,-384 783,-372 783,-372 783,-366 789,-360 795,-360 795,-360 834,-360 834,-360 840,-360 846,-366 846,-372 846,-372 846,-384 846,-384 846,-390 840,-396 834,-396"/>
@@ -36,116 +36,121 @@
 </g>
 <!-- WeakHashMap -->
 <g id="node6" class="node"><title>WeakHashMap</title>
-<path fill="#4a5659" stroke="#4a5659" d="M156,-324C156,-324 77,-324 77,-324 71,-324 65,-318 65,-312 65,-312 65,-300 65,-300 65,-294 71,-288 77,-288 77,-288 156,-288 156,-288 162,-288 168,-294 168,-300 168,-300 168,-312 168,-312 168,-318 162,-324 156,-324"/>
-<text text-anchor="middle" x="116.5" y="-302.3" font-family="Times New Roman,serif" font-size="14.00" fill="#ffffff">WeakHashMap</text>
+<path fill="#4a5659" stroke="#4a5659" d="M140,-324C140,-324 61,-324 61,-324 55,-324 49,-318 49,-312 49,-312 49,-300 49,-300 49,-294 55,-288 61,-288 61,-288 140,-288 140,-288 146,-288 152,-294 152,-300 152,-300 152,-312 152,-312 152,-318 146,-324 140,-324"/>
+<text text-anchor="middle" x="100.5" y="-302.3" font-family="Times New Roman,serif" font-size="14.00" fill="#ffffff">WeakHashMap</text>
 </g>
 <!-- LinkedHashMap -->
 <g id="node7" class="node"><title>LinkedHashMap</title>
-<path fill="#4a5659" stroke="#4a5659" d="M283,-324C283,-324 198,-324 198,-324 192,-324 186,-318 186,-312 186,-312 186,-300 186,-300 186,-294 192,-288 198,-288 198,-288 283,-288 283,-288 289,-288 295,-294 295,-300 295,-300 295,-312 295,-312 295,-318 289,-324 283,-324"/>
-<text text-anchor="middle" x="240.5" y="-302.3" font-family="Times New Roman,serif" font-size="14.00" fill="#ffffff">LinkedHashMap</text>
+<path fill="#4a5659" stroke="#4a5659" d="M267,-324C267,-324 182,-324 182,-324 176,-324 170,-318 170,-312 170,-312 170,-300 170,-300 170,-294 176,-288 182,-288 182,-288 267,-288 267,-288 273,-288 279,-294 279,-300 279,-300 279,-312 279,-312 279,-318 273,-324 267,-324"/>
+<text text-anchor="middle" x="224.5" y="-302.3" font-family="Times New Roman,serif" font-size="14.00" fill="#ffffff">LinkedHashMap</text>
 </g>
 <!-- ListMap -->
 <g id="node8" class="node"><title>ListMap</title>
-<path fill="#4a5659" stroke="#4a5659" d="M364,-324C364,-324 325,-324 325,-324 319,-324 313,-318 313,-312 313,-312 313,-300 313,-300 313,-294 319,-288 325,-288 325,-288 364,-288 364,-288 370,-288 376,-294 376,-300 376,-300 376,-312 376,-312 376,-318 370,-324 364,-324"/>
-<text text-anchor="middle" x="344.5" y="-302.3" font-family="Times New Roman,serif" font-size="14.00" fill="#ffffff">ListMap</text>
+<path fill="#4a5659" stroke="#4a5659" d="M348,-324C348,-324 309,-324 309,-324 303,-324 297,-318 297,-312 297,-312 297,-300 297,-300 297,-294 303,-288 309,-288 309,-288 348,-288 348,-288 354,-288 360,-294 360,-300 360,-300 360,-312 360,-312 360,-318 354,-324 348,-324"/>
+<text text-anchor="middle" x="328.5" y="-302.3" font-family="Times New Roman,serif" font-size="14.00" fill="#ffffff">ListMap</text>
+</g>
+<!-- TreeMap -->
+<g id="node9" class="node"><title>TreeMap</title>
+<path fill="#4a5659" stroke="#4a5659" d="M411.5,-396C411.5,-396 367.5,-396 367.5,-396 361.5,-396 355.5,-390 355.5,-384 355.5,-384 355.5,-372 355.5,-372 355.5,-366 361.5,-360 367.5,-360 367.5,-360 411.5,-360 411.5,-360 417.5,-360 423.5,-366 423.5,-372 423.5,-372 423.5,-384 423.5,-384 423.5,-390 417.5,-396 411.5,-396"/>
+<text text-anchor="middle" x="389.5" y="-374.3" font-family="Times New Roman,serif" font-size="14.00" fill="#ffffff">TreeMap</text>
 </g>
 <!-- ImmutableMapAdaptor -->
-<g id="node9" class="node"><title>ImmutableMapAdaptor</title>
-<path fill="#4a5659" stroke="#4a5659" d="M529,-324C529,-324 406,-324 406,-324 400,-324 394,-318 394,-312 394,-312 394,-300 394,-300 394,-294 400,-288 406,-288 406,-288 529,-288 529,-288 535,-288 541,-294 541,-300 541,-300 541,-312 541,-312 541,-318 535,-324 529,-324"/>
-<text text-anchor="middle" x="467.5" y="-302.3" font-family="Times New Roman,serif" font-size="14.00" fill="#ffffff">ImmutableMapAdaptor</text>
+<g id="node10" class="node"><title>ImmutableMapAdaptor</title>
+<path fill="#4a5659" stroke="#4a5659" d="M513,-324C513,-324 390,-324 390,-324 384,-324 378,-318 378,-312 378,-312 378,-300 378,-300 378,-294 384,-288 390,-288 390,-288 513,-288 513,-288 519,-288 525,-294 525,-300 525,-300 525,-312 525,-312 525,-318 519,-324 513,-324"/>
+<text text-anchor="middle" x="451.5" y="-302.3" font-family="Times New Roman,serif" font-size="14.00" fill="#ffffff">ImmutableMapAdaptor</text>
 </g>
 <!-- ArraySeq -->
-<g id="node10" class="node"><title>ArraySeq</title>
-<path fill="#4a5659" stroke="#4a5659" d="M957.5,-180C957.5,-180 911.5,-180 911.5,-180 905.5,-180 899.5,-174 899.5,-168 899.5,-168 899.5,-156 899.5,-156 899.5,-150 905.5,-144 911.5,-144 911.5,-144 957.5,-144 957.5,-144 963.5,-144 969.5,-150 969.5,-156 969.5,-156 969.5,-168 969.5,-168 969.5,-174 963.5,-180 957.5,-180"/>
-<text text-anchor="middle" x="934.5" y="-158.3" font-family="Times New Roman,serif" font-size="14.00" fill="#ffffff">ArraySeq</text>
+<g id="node11" class="node"><title>ArraySeq</title>
+<path fill="#4a5659" stroke="#4a5659" d="M874.5,-180C874.5,-180 828.5,-180 828.5,-180 822.5,-180 816.5,-174 816.5,-168 816.5,-168 816.5,-156 816.5,-156 816.5,-150 822.5,-144 828.5,-144 828.5,-144 874.5,-144 874.5,-144 880.5,-144 886.5,-150 886.5,-156 886.5,-156 886.5,-168 886.5,-168 886.5,-174 880.5,-180 874.5,-180"/>
+<text text-anchor="middle" x="851.5" y="-158.3" font-family="Times New Roman,serif" font-size="14.00" fill="#ffffff">ArraySeq</text>
 </g>
 <!-- ArrayBuffer -->
-<g id="node11" class="node"><title>ArrayBuffer</title>
-<path fill="#4a5659" stroke="#4a5659" d="M1097,-180C1097,-180 1038,-180 1038,-180 1032,-180 1026,-174 1026,-168 1026,-168 1026,-156 1026,-156 1026,-150 1032,-144 1038,-144 1038,-144 1097,-144 1097,-144 1103,-144 1109,-150 1109,-156 1109,-156 1109,-168 1109,-168 1109,-174 1103,-180 1097,-180"/>
-<text text-anchor="middle" x="1067.5" y="-158.3" font-family="Times New Roman,serif" font-size="14.00" fill="#ffffff">ArrayBuffer</text>
+<g id="node12" class="node"><title>ArrayBuffer</title>
+<path fill="#4a5659" stroke="#4a5659" d="M1014,-180C1014,-180 955,-180 955,-180 949,-180 943,-174 943,-168 943,-168 943,-156 943,-156 943,-150 949,-144 955,-144 955,-144 1014,-144 1014,-144 1020,-144 1026,-150 1026,-156 1026,-156 1026,-168 1026,-168 1026,-174 1020,-180 1014,-180"/>
+<text text-anchor="middle" x="984.5" y="-158.3" font-family="Times New Roman,serif" font-size="14.00" fill="#ffffff">ArrayBuffer</text>
 </g>
 <!-- StringBuilder -->
-<g id="node12" class="node"><title>StringBuilder</title>
-<path fill="#4a5659" stroke="#4a5659" d="M1030,-108C1030,-108 965,-108 965,-108 959,-108 953,-102 953,-96 953,-96 953,-84 953,-84 953,-78 959,-72 965,-72 965,-72 1030,-72 1030,-72 1036,-72 1042,-78 1042,-84 1042,-84 1042,-96 1042,-96 1042,-102 1036,-108 1030,-108"/>
-<text text-anchor="middle" x="997.5" y="-86.3" font-family="Times New Roman,serif" font-size="14.00" fill="#ffffff">StringBuilder</text>
+<g id="node13" class="node"><title>StringBuilder</title>
+<path fill="#4a5659" stroke="#4a5659" d="M947,-108C947,-108 882,-108 882,-108 876,-108 870,-102 870,-96 870,-96 870,-84 870,-84 870,-78 876,-72 882,-72 882,-72 947,-72 947,-72 953,-72 959,-78 959,-84 959,-84 959,-96 959,-96 959,-102 953,-108 947,-108"/>
+<text text-anchor="middle" x="914.5" y="-86.3" font-family="Times New Roman,serif" font-size="14.00" fill="#ffffff">StringBuilder</text>
 </g>
 <!-- ListBuffer -->
-<g id="node13" class="node"><title>ListBuffer</title>
-<path fill="#4a5659" stroke="#4a5659" d="M1141,-108C1141,-108 1092,-108 1092,-108 1086,-108 1080,-102 1080,-96 1080,-96 1080,-84 1080,-84 1080,-78 1086,-72 1092,-72 1092,-72 1141,-72 1141,-72 1147,-72 1153,-78 1153,-84 1153,-84 1153,-96 1153,-96 1153,-102 1147,-108 1141,-108"/>
-<text text-anchor="middle" x="1116.5" y="-86.3" font-family="Times New Roman,serif" font-size="14.00" fill="#ffffff">ListBuffer</text>
+<g id="node14" class="node"><title>ListBuffer</title>
+<path fill="#4a5659" stroke="#4a5659" d="M1058,-108C1058,-108 1009,-108 1009,-108 1003,-108 997,-102 997,-96 997,-96 997,-84 997,-84 997,-78 1003,-72 1009,-72 1009,-72 1058,-72 1058,-72 1064,-72 1070,-78 1070,-84 1070,-84 1070,-96 1070,-96 1070,-102 1064,-108 1058,-108"/>
+<text text-anchor="middle" x="1033.5" y="-86.3" font-family="Times New Roman,serif" font-size="14.00" fill="#ffffff">ListBuffer</text>
 </g>
 <!-- Stack -->
-<g id="node14" class="node"><title>Stack</title>
-<path fill="#4a5659" stroke="#4a5659" d="M470.5,-252C470.5,-252 440.5,-252 440.5,-252 434.5,-252 428.5,-246 428.5,-240 428.5,-240 428.5,-228 428.5,-228 428.5,-222 434.5,-216 440.5,-216 440.5,-216 470.5,-216 470.5,-216 476.5,-216 482.5,-222 482.5,-228 482.5,-228 482.5,-240 482.5,-240 482.5,-246 476.5,-252 470.5,-252"/>
-<text text-anchor="middle" x="455.5" y="-230.3" font-family="Times New Roman,serif" font-size="14.00" fill="#ffffff">Stack</text>
+<g id="node15" class="node"><title>Stack</title>
+<path fill="#4a5659" stroke="#4a5659" d="M569.5,-252C569.5,-252 539.5,-252 539.5,-252 533.5,-252 527.5,-246 527.5,-240 527.5,-240 527.5,-228 527.5,-228 527.5,-222 533.5,-216 539.5,-216 539.5,-216 569.5,-216 569.5,-216 575.5,-216 581.5,-222 581.5,-228 581.5,-228 581.5,-240 581.5,-240 581.5,-246 575.5,-252 569.5,-252"/>
+<text text-anchor="middle" x="554.5" y="-230.3" font-family="Times New Roman,serif" font-size="14.00" fill="#ffffff">Stack</text>
 </g>
 <!-- SynchronizedStack -->
-<g id="node16" class="node"><title>SynchronizedStack</title>
-<path fill="#4a5659" stroke="#4a5659" d="M447,-180C447,-180 346,-180 346,-180 340,-180 334,-174 334,-168 334,-168 334,-156 334,-156 334,-150 340,-144 346,-144 346,-144 447,-144 447,-144 453,-144 459,-150 459,-156 459,-156 459,-168 459,-168 459,-174 453,-180 447,-180"/>
-<text text-anchor="middle" x="396.5" y="-158.3" font-family="Times New Roman,serif" font-size="14.00" fill="#ffffff">SynchronizedStack</text>
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 </g>
 <!-- Stack&#45;&gt;SynchronizedStack -->
-<g id="edge37" class="edge"><title>Stack&#45;&gt;SynchronizedStack</title>
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-<text text-anchor="middle" x="707.5" y="-158.3" font-family="Times New Roman,serif" font-size="14.00" fill="#ffffff">MutableList</text>
+<g id="node21" class="node"><title>MutableList</title>
+<path fill="#4a5659" stroke="#4a5659" d="M654,-180C654,-180 595,-180 595,-180 589,-180 583,-174 583,-168 583,-168 583,-156 583,-156 583,-150 589,-144 595,-144 595,-144 654,-144 654,-144 660,-144 666,-150 666,-156 666,-156 666,-168 666,-168 666,-174 660,-180 654,-180"/>
+<text text-anchor="middle" x="624.5" y="-158.3" font-family="Times New Roman,serif" font-size="14.00" fill="#ffffff">MutableList</text>
 </g>
 <!-- Queue -->
-<g id="node40" class="node"><title>Queue</title>
-<path fill="#6dc6e6" stroke="#6dc6e6" d="M722.5,-108C722.5,-108 692.5,-108 692.5,-108 686.5,-108 680.5,-102 680.5,-96 680.5,-96 680.5,-84 680.5,-84 680.5,-78 686.5,-72 692.5,-72 692.5,-72 722.5,-72 722.5,-72 728.5,-72 734.5,-78 734.5,-84 734.5,-84 734.5,-96 734.5,-96 734.5,-102 728.5,-108 722.5,-108"/>
-<text text-anchor="middle" x="707.5" y="-86.3" font-family="Times New Roman,serif" font-size="14.00" fill="#ffffff">Queue</text>
+<g id="node41" class="node"><title>Queue</title>
+<path fill="#6dc6e6" stroke="#6dc6e6" d="M639.5,-108C639.5,-108 609.5,-108 609.5,-108 603.5,-108 597.5,-102 597.5,-96 597.5,-96 597.5,-84 597.5,-84 597.5,-78 603.5,-72 609.5,-72 609.5,-72 639.5,-72 639.5,-72 645.5,-72 651.5,-78 651.5,-84 651.5,-84 651.5,-96 651.5,-96 651.5,-102 645.5,-108 639.5,-108"/>
+<text text-anchor="middle" x="624.5" y="-86.3" font-family="Times New Roman,serif" font-size="14.00" fill="#ffffff">Queue</text>
 </g>
 <!-- MutableList&#45;&gt;Queue -->
-<g id="edge39" class="edge"><title>MutableList&#45;&gt;Queue</title>
-<path fill="none" stroke="#7f7f7f" d="M707.5,-143.697C707.5,-135.983 707.5,-126.712 707.5,-118.112"/>
-<polygon fill="#7f7f7f" stroke="#7f7f7f" points="711,-118.104 707.5,-108.104 704,-118.104 711,-118.104"/>
+<g id="edge40" class="edge"><title>MutableList&#45;&gt;Queue</title>
+<path fill="none" stroke="#7f7f7f" d="M624.5,-143.697C624.5,-135.983 624.5,-126.712 624.5,-118.112"/>
+<polygon fill="#7f7f7f" stroke="#7f7f7f" points="628,-118.104 624.5,-108.104 621,-118.104 628,-118.104"/>
 </g>
 <!-- LinkedList -->
-<g id="node21" class="node"><title>LinkedList</title>
-<path fill="#4a5659" stroke="#4a5659" d="M831.5,-180C831.5,-180 779.5,-180 779.5,-180 773.5,-180 767.5,-174 767.5,-168 767.5,-168 767.5,-156 767.5,-156 767.5,-150 773.5,-144 779.5,-144 779.5,-144 831.5,-144 831.5,-144 837.5,-144 843.5,-150 843.5,-156 843.5,-156 843.5,-168 843.5,-168 843.5,-174 837.5,-180 831.5,-180"/>
-<text text-anchor="middle" x="805.5" y="-158.3" font-family="Times New Roman,serif" font-size="14.00" fill="#ffffff">LinkedList</text>
+<g id="node22" class="node"><title>LinkedList</title>
+<path fill="#4a5659" stroke="#4a5659" d="M748.5,-180C748.5,-180 696.5,-180 696.5,-180 690.5,-180 684.5,-174 684.5,-168 684.5,-168 684.5,-156 684.5,-156 684.5,-150 690.5,-144 696.5,-144 696.5,-144 748.5,-144 748.5,-144 754.5,-144 760.5,-150 760.5,-156 760.5,-156 760.5,-168 760.5,-168 760.5,-174 754.5,-180 748.5,-180"/>
+<text text-anchor="middle" x="722.5" y="-158.3" font-family="Times New Roman,serif" font-size="14.00" fill="#ffffff">LinkedList</text>
 </g>
 <!-- DoubleLinkedList -->
-<g id="node22" class="node"><title>DoubleLinkedList</title>
-<path fill="#4a5659" stroke="#4a5659" d="M917.5,-108C917.5,-108 825.5,-108 825.5,-108 819.5,-108 813.5,-102 813.5,-96 813.5,-96 813.5,-84 813.5,-84 813.5,-78 819.5,-72 825.5,-72 825.5,-72 917.5,-72 917.5,-72 923.5,-72 929.5,-78 929.5,-84 929.5,-84 929.5,-96 929.5,-96 929.5,-102 923.5,-108 917.5,-108"/>
-<text text-anchor="middle" x="871.5" y="-86.3" font-family="Times New Roman,serif" font-size="14.00" fill="#ffffff">DoubleLinkedList</text>
+<g id="node23" class="node"><title>DoubleLinkedList</title>
+<path fill="#4a5659" stroke="#4a5659" d="M834.5,-108C834.5,-108 742.5,-108 742.5,-108 736.5,-108 730.5,-102 730.5,-96 730.5,-96 730.5,-84 730.5,-84 730.5,-78 736.5,-72 742.5,-72 742.5,-72 834.5,-72 834.5,-72 840.5,-72 846.5,-78 846.5,-84 846.5,-84 846.5,-96 846.5,-96 846.5,-102 840.5,-108 834.5,-108"/>
+<text text-anchor="middle" x="788.5" y="-86.3" font-family="Times New Roman,serif" font-size="14.00" fill="#ffffff">DoubleLinkedList</text>
 </g>
 <!-- Traversable -->
-<g id="node23" class="node"><title>Traversable</title>
+<g id="node24" class="node"><title>Traversable</title>
 <path fill="#6dc6e6" stroke="#6dc6e6" d="M783.5,-612C783.5,-612 725.5,-612 725.5,-612 719.5,-612 713.5,-606 713.5,-600 713.5,-600 713.5,-588 713.5,-588 713.5,-582 719.5,-576 725.5,-576 725.5,-576 783.5,-576 783.5,-576 789.5,-576 795.5,-582 795.5,-588 795.5,-588 795.5,-600 795.5,-600 795.5,-606 789.5,-612 783.5,-612"/>
 <text text-anchor="middle" x="754.5" y="-590.3" font-family="Times New Roman,serif" font-size="14.00" fill="#ffffff">Traversable</text>
 </g>
 <!-- Iterable -->
-<g id="node24" class="node"><title>Iterable</title>
+<g id="node25" class="node"><title>Iterable</title>
 <path fill="#6dc6e6" stroke="#6dc6e6" d="M771.5,-540C771.5,-540 737.5,-540 737.5,-540 731.5,-540 725.5,-534 725.5,-528 725.5,-528 725.5,-516 725.5,-516 725.5,-510 731.5,-504 737.5,-504 737.5,-504 771.5,-504 771.5,-504 777.5,-504 783.5,-510 783.5,-516 783.5,-516 783.5,-528 783.5,-528 783.5,-534 777.5,-540 771.5,-540"/>
 <text text-anchor="middle" x="754.5" y="-518.3" font-family="Times New Roman,serif" font-size="14.00" fill="#ffffff">Iterable</text>
 </g>
@@ -154,18 +159,23 @@
 <path fill="none" stroke="#7f7f7f" stroke-width="4" d="M754.5,-575.697C754.5,-567.983 754.5,-558.712 754.5,-550.112"/>
 <polygon fill="#7f7f7f" stroke="#7f7f7f" stroke-width="4" points="758,-550.104 754.5,-540.104 751,-550.104 758,-550.104"/>
 </g>
+<!-- Iterable&#45;&gt;PriorityQueue -->
+<g id="edge5" class="edge"><title>Iterable&#45;&gt;PriorityQueue</title>
+<path fill="none" stroke="#7f7f7f" d="M783.508,-522C786.007,-522 788.506,-522 791.005,-522"/>
+<polygon fill="#7f7f7f" stroke="#7f7f7f" points="791.279,-525.5 801.279,-522 791.279,-518.5 791.279,-525.5"/>
+</g>
 <!-- Map -->
-<g id="node25" class="node"><title>Map</title>
-<path fill="#6dc6e6" stroke="#6dc6e6" d="M361.5,-468C361.5,-468 331.5,-468 331.5,-468 325.5,-468 319.5,-462 319.5,-456 319.5,-456 319.5,-444 319.5,-444 319.5,-438 325.5,-432 331.5,-432 331.5,-432 361.5,-432 361.5,-432 367.5,-432 373.5,-438 373.5,-444 373.5,-444 373.5,-456 373.5,-456 373.5,-462 367.5,-468 361.5,-468"/>
-<text text-anchor="middle" x="346.5" y="-446.3" font-family="Times New Roman,serif" font-size="14.00" fill="#ffffff">Map</text>
+<g id="node26" class="node"><title>Map</title>
+<path fill="#6dc6e6" stroke="#6dc6e6" d="M404.5,-468C404.5,-468 374.5,-468 374.5,-468 368.5,-468 362.5,-462 362.5,-456 362.5,-456 362.5,-444 362.5,-444 362.5,-438 368.5,-432 374.5,-432 374.5,-432 404.5,-432 404.5,-432 410.5,-432 416.5,-438 416.5,-444 416.5,-444 416.5,-456 416.5,-456 416.5,-462 410.5,-468 404.5,-468"/>
+<text text-anchor="middle" x="389.5" y="-446.3" font-family="Times New Roman,serif" font-size="14.00" fill="#ffffff">Map</text>
 </g>
 <!-- Iterable&#45;&gt;Map -->
 <g id="edge2" class="edge"><title>Iterable&#45;&gt;Map</title>
-<path fill="none" stroke="#7f7f7f" d="M725.485,-516.022C653.092,-503.602 464.547,-471.253 383.937,-457.423"/>
-<polygon fill="#7f7f7f" stroke="#7f7f7f" points="384.2,-453.917 373.752,-455.676 383.016,-460.816 384.2,-453.917"/>
+<path fill="none" stroke="#7f7f7f" d="M725.248,-515.39C659.463,-502.774 499.924,-472.177 426.997,-458.191"/>
+<polygon fill="#7f7f7f" stroke="#7f7f7f" points="427.368,-454.699 416.888,-456.252 426.049,-461.573 427.368,-454.699"/>
 </g>
 <!-- Seq -->
-<g id="node26" class="node"><title>Seq</title>
+<g id="node27" class="node"><title>Seq</title>
 <path fill="#6dc6e6" stroke="#6dc6e6" d="M769.5,-324C769.5,-324 739.5,-324 739.5,-324 733.5,-324 727.5,-318 727.5,-312 727.5,-312 727.5,-300 727.5,-300 727.5,-294 733.5,-288 739.5,-288 739.5,-288 769.5,-288 769.5,-288 775.5,-288 781.5,-294 781.5,-300 781.5,-300 781.5,-312 781.5,-312 781.5,-318 775.5,-324 769.5,-324"/>
 <text text-anchor="middle" x="754.5" y="-302.3" font-family="Times New Roman,serif" font-size="14.00" fill="#ffffff">Seq</text>
 </g>
@@ -175,239 +185,239 @@
 <polygon fill="#7f7f7f" stroke="#7f7f7f" stroke-width="4" points="758,-334.232 754.5,-324.232 751,-334.232 758,-334.232"/>
 </g>
 <!-- Set -->
-<g id="node27" class="node"><title>Set</title>
+<g id="node28" class="node"><title>Set</title>
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 <text text-anchor="middle" x="1032.5" y="-446.3" font-family="Times New Roman,serif" font-size="14.00" fill="#ffffff">Set</text>
 </g>
 <!-- Iterable&#45;&gt;Set -->
 <g id="edge4" class="edge"><title>Iterable&#45;&gt;Set</title>
-<path fill="none" stroke="#7f7f7f" d="M783.725,-513.641C834.645,-500.82 939.526,-474.411 995.46,-460.327"/>
-<polygon fill="#7f7f7f" stroke="#7f7f7f" points="996.468,-463.682 1005.31,-457.846 994.758,-456.894 996.468,-463.682"/>
+<path fill="none" stroke="#7f7f7f" d="M783.725,-507.218C786.658,-506.049 789.618,-504.952 792.5,-504 862.711,-480.81 947.836,-464.731 995.515,-456.761"/>
+<polygon fill="#7f7f7f" stroke="#7f7f7f" points="996.085,-460.214 1005.38,-455.138 994.949,-453.307 996.085,-460.214"/>
 </g>
 <!-- Map&#45;&gt;HashMap -->
-<g id="edge5" class="edge"><title>Map&#45;&gt;HashMap</title>
-<path fill="none" stroke="#7f7f7f" stroke-width="4" d="M319.222,-445.18C272.152,-438.248 172.62,-422.103 81.0357,-396.215"/>
-<polygon fill="#7f7f7f" stroke="#7f7f7f" stroke-width="4" points="81.9226,-392.828 71.3449,-393.43 79.9891,-399.556 81.9226,-392.828"/>
+<g id="edge6" class="edge"><title>Map&#45;&gt;HashMap</title>
+<path fill="none" stroke="#7f7f7f" stroke-width="4" d="M362.149,-446.18C309.232,-440.332 189.186,-425.15 81.0759,-396.172"/>
+<polygon fill="#7f7f7f" stroke="#7f7f7f" stroke-width="4" points="81.8908,-392.767 71.3221,-393.511 80.048,-399.52 81.8908,-392.767"/>
 </g>
 <!-- Map&#45;&gt;OpenHashMap -->
-<g id="edge7" class="edge"><title>Map&#45;&gt;OpenHashMap</title>
-<path fill="none" stroke="#7f7f7f" d="M319.438,-439.849C289.167,-429.612 239.185,-412.71 199.572,-399.314"/>
-<polygon fill="#7f7f7f" stroke="#7f7f7f" points="200.596,-395.966 190.001,-396.078 198.353,-402.597 200.596,-395.966"/>
+<g id="edge8" class="edge"><title>Map&#45;&gt;OpenHashMap</title>
+<path fill="none" stroke="#7f7f7f" d="M362.27,-441.376C323.512,-430.523 251.413,-410.336 199.729,-395.864"/>
+<polygon fill="#7f7f7f" stroke="#7f7f7f" points="200.578,-392.467 190.004,-393.141 198.69,-399.208 200.578,-392.467"/>
 </g>
 <!-- Map&#45;&gt;WeakHashMap -->
-<g id="edge6" class="edge"><title>Map&#45;&gt;WeakHashMap</title>
-<path fill="none" stroke="#7f7f7f" d="M319.213,-432.153C277.825,-406.601 199.121,-358.01 152.9,-329.473"/>
-<polygon fill="#7f7f7f" stroke="#7f7f7f" points="154.457,-326.321 144.109,-324.046 150.78,-332.277 154.457,-326.321"/>
+<g id="edge7" class="edge"><title>Map&#45;&gt;WeakHashMap</title>
+<path fill="none" stroke="#7f7f7f" d="M362.312,-435.641C312.295,-411.065 205.28,-358.483 144.695,-328.715"/>
+<polygon fill="#7f7f7f" stroke="#7f7f7f" points="145.905,-325.41 135.386,-324.141 142.818,-331.692 145.905,-325.41"/>
 </g>
 <!-- Map&#45;&gt;LinkedHashMap -->
-<g id="edge8" class="edge"><title>Map&#45;&gt;LinkedHashMap</title>
-<path fill="none" stroke="#7f7f7f" d="M333.714,-431.871C315.25,-407.137 280.991,-361.242 259.544,-332.512"/>
-<polygon fill="#7f7f7f" stroke="#7f7f7f" points="262.118,-330.109 253.331,-324.189 256.509,-334.296 262.118,-330.109"/>
+<g id="edge9" class="edge"><title>Map&#45;&gt;LinkedHashMap</title>
+<path fill="none" stroke="#7f7f7f" d="M369.597,-431.871C340.361,-406.711 285.682,-359.654 252.436,-331.042"/>
+<polygon fill="#7f7f7f" stroke="#7f7f7f" points="254.336,-328.059 244.473,-324.189 249.77,-333.365 254.336,-328.059"/>
 </g>
 <!-- Map&#45;&gt;ListMap -->
-<g id="edge12" class="edge"><title>Map&#45;&gt;ListMap</title>
-<path fill="none" stroke="#7f7f7f" d="M346.259,-431.871C345.918,-407.67 345.292,-363.211 344.886,-334.393"/>
-<polygon fill="#7f7f7f" stroke="#7f7f7f" points="348.383,-334.139 344.742,-324.189 341.383,-334.238 348.383,-334.139"/>
+<g id="edge14" class="edge"><title>Map&#45;&gt;ListMap</title>
+<path fill="none" stroke="#7f7f7f" d="M371.99,-431.858C363.05,-422.14 352.766,-409.29 346.5,-396 337.283,-376.452 332.776,-352.317 330.577,-334.114"/>
+<polygon fill="#7f7f7f" stroke="#7f7f7f" points="334.057,-333.741 329.531,-324.161 327.096,-334.472 334.057,-333.741"/>
+</g>
+<!-- Map&#45;&gt;TreeMap -->
+<g id="edge13" class="edge"><title>Map&#45;&gt;TreeMap</title>
+<path fill="none" stroke="#7f7f7f" d="M389.5,-431.697C389.5,-423.983 389.5,-414.712 389.5,-406.112"/>
+<polygon fill="#7f7f7f" stroke="#7f7f7f" points="393,-406.104 389.5,-396.104 386,-406.104 393,-406.104"/>
 </g>
 <!-- Map&#45;&gt;ImmutableMapAdaptor -->
-<g id="edge11" class="edge"><title>Map&#45;&gt;ImmutableMapAdaptor</title>
-<path fill="none" stroke="#7f7f7f" d="M350.508,-431.97C355.716,-412.757 366.36,-381.405 384.5,-360 394.837,-347.803 408.697,-337.444 422.128,-329.209"/>
-<polygon fill="#7f7f7f" stroke="#7f7f7f" points="423.986,-332.177 430.85,-324.106 420.451,-326.135 423.986,-332.177"/>
+<g id="edge12" class="edge"><title>Map&#45;&gt;ImmutableMapAdaptor</title>
+<path fill="none" stroke="#7f7f7f" d="M406.953,-431.831C415.876,-422.105 426.163,-409.256 432.5,-396 441.843,-376.458 446.628,-352.323 449.057,-334.118"/>
+<polygon fill="#7f7f7f" stroke="#7f7f7f" points="452.536,-334.505 450.232,-324.164 445.584,-333.685 452.536,-334.505"/>
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 <!-- ObservableMap -->
-<g id="node28" class="node"><title>ObservableMap</title>
-<path fill="#6dc6e6" stroke="#6dc6e6" d="M487.5,-396C487.5,-396 405.5,-396 405.5,-396 399.5,-396 393.5,-390 393.5,-384 393.5,-384 393.5,-372 393.5,-372 393.5,-366 399.5,-360 405.5,-360 405.5,-360 487.5,-360 487.5,-360 493.5,-360 499.5,-366 499.5,-372 499.5,-372 499.5,-384 499.5,-384 499.5,-390 493.5,-396 487.5,-396"/>
-<text text-anchor="middle" x="446.5" y="-374.3" font-family="Times New Roman,serif" font-size="14.00" fill="#ffffff">ObservableMap</text>
+<g id="node29" class="node"><title>ObservableMap</title>
+<path fill="#6dc6e6" stroke="#6dc6e6" d="M637.5,-324C637.5,-324 555.5,-324 555.5,-324 549.5,-324 543.5,-318 543.5,-312 543.5,-312 543.5,-300 543.5,-300 543.5,-294 549.5,-288 555.5,-288 555.5,-288 637.5,-288 637.5,-288 643.5,-288 649.5,-294 649.5,-300 649.5,-300 649.5,-312 649.5,-312 649.5,-318 643.5,-324 637.5,-324"/>
+<text text-anchor="middle" x="596.5" y="-302.3" font-family="Times New Roman,serif" font-size="14.00" fill="#ffffff">ObservableMap</text>
 </g>
 <!-- Map&#45;&gt;ObservableMap -->
-<g id="edge9" class="edge"><title>Map&#45;&gt;ObservableMap</title>
-<path fill="none" stroke="#7f7f7f" d="M370.963,-431.876C383.796,-422.893 399.696,-411.763 413.594,-402.034"/>
-<polygon fill="#7f7f7f" stroke="#7f7f7f" points="415.758,-404.792 421.943,-396.19 411.744,-399.057 415.758,-404.792"/>
+<g id="edge10" class="edge"><title>Map&#45;&gt;ObservableMap</title>
+<path fill="none" stroke="#7f7f7f" d="M410.958,-431.928C434.429,-413.498 473.393,-383.614 508.5,-360 524.211,-349.432 542.025,-338.515 557.496,-329.355"/>
+<polygon fill="#7f7f7f" stroke="#7f7f7f" points="559.453,-332.265 566.301,-324.181 555.906,-326.23 559.453,-332.265"/>
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 <!-- SynchronizedMap -->
-<g id="node29" class="node"><title>SynchronizedMap</title>
+<g id="node30" class="node"><title>SynchronizedMap</title>
 <path fill="#6dc6e6" stroke="#6dc6e6" d="M625,-396C625,-396 530,-396 530,-396 524,-396 518,-390 518,-384 518,-384 518,-372 518,-372 518,-366 524,-360 530,-360 530,-360 625,-360 625,-360 631,-360 637,-366 637,-372 637,-372 637,-384 637,-384 637,-390 631,-396 625,-396"/>
 <text text-anchor="middle" x="577.5" y="-374.3" font-family="Times New Roman,serif" font-size="14.00" fill="#ffffff">SynchronizedMap</text>
 </g>
 <!-- Map&#45;&gt;SynchronizedMap -->
-<g id="edge10" class="edge"><title>Map&#45;&gt;SynchronizedMap</title>
-<path fill="none" stroke="#7f7f7f" d="M373.906,-440.695C407.531,-430.506 465.681,-412.885 511.248,-399.076"/>
-<polygon fill="#7f7f7f" stroke="#7f7f7f" points="512.505,-402.353 521.06,-396.103 510.475,-395.653 512.505,-402.353"/>
+<g id="edge11" class="edge"><title>Map&#45;&gt;SynchronizedMap</title>
+<path fill="none" stroke="#7f7f7f" d="M416.837,-438.821C444.297,-428.597 487.396,-412.549 522.044,-399.648"/>
+<polygon fill="#7f7f7f" stroke="#7f7f7f" points="523.423,-402.87 531.573,-396.1 520.98,-396.31 523.423,-402.87"/>
 </g>
 <!-- MultiMap -->
-<g id="node30" class="node"><title>MultiMap</title>
+<g id="node31" class="node"><title>MultiMap</title>
 <path fill="#6dc6e6" stroke="#6dc6e6" d="M714,-396C714,-396 667,-396 667,-396 661,-396 655,-390 655,-384 655,-384 655,-372 655,-372 655,-366 661,-360 667,-360 667,-360 714,-360 714,-360 720,-360 726,-366 726,-372 726,-372 726,-384 726,-384 726,-390 720,-396 714,-396"/>
 <text text-anchor="middle" x="690.5" y="-374.3" font-family="Times New Roman,serif" font-size="14.00" fill="#ffffff">MultiMap</text>
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 <!-- Map&#45;&gt;MultiMap -->
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+<g id="edge16" class="edge"><title>Set&#45;&gt;HashSet</title>
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+<g id="edge18" class="edge"><title>Set&#45;&gt;ImmutableSetAdaptor</title>
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+<g id="edge17" class="edge"><title>Set&#45;&gt;ObservableSet</title>
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