diff --git a/statik/Batch.cpp b/statik/Batch.cpp
index 1185337..7ee6c8f 100644
--- a/statik/Batch.cpp
+++ b/statik/Batch.cpp
@@ -29,7 +29,7 @@ std::string Batch::BatchItem::Print() const {
     s += lexical_cast<string>(node) + " " + node->Print();
   }
   if (pos) {
-    s += " @ " + pos->Print();
+    s += " @ " + lexical_cast<string>(pos) + " " + pos->Print();
   }
   return s;
 }
diff --git a/statik/IncParser.cpp b/statik/IncParser.cpp
index 3da1d04..e37f467 100644
--- a/statik/IncParser.cpp
+++ b/statik/IncParser.cpp
@@ -11,6 +11,9 @@
 #include "SLog.h"
 #include "STree.h"
 
+#include <boost/lexical_cast.hpp>
+using boost::lexical_cast;
+
 #include <map>
 #include <memory>
 #include <set>
@@ -370,7 +373,7 @@ void IncParser::ProcessActions() {
 }
 
 void IncParser::ComputeOutput_Update(const STree& node, Batch& out_batch, const List*& behind_node, State::Station worst_station) {
-  g_log.debug() << "IncParser " << m_name << ": Computing output UPDATE for node " << node;
+  g_log.debug() << "IncParser " << m_name << ": Computing output UPDATE for node " << node << " with behind node " << behind_node;
   worst_station = std::min(node.GetState().GetStation(), worst_station);
 
   node.GetOutputFunc() ();
@@ -391,103 +394,32 @@ void IncParser::ComputeOutput_Update(const STree& node, Batch& out_batch, const
   g_log.debug() << node << " was emitting " << prev_output.size() << " items";
   g_log.debug() << node << " is now emitting " << output.size() << " items";
 
-  // Linear pass through both lists, comparing elements.
-  OutputList::iterator item = output.begin();
-  OutputList::const_iterator prev_item = prev_output.begin();
-  while (item != output.end() && prev_item != prev_output.end()) {
-    if (*item == *prev_item) {
-      g_log.debug() << "CO_Update for " << node << " linear pass, case 1 (lists match); before call, have batch=" << out_batch;
-      UpdateOutput(*item, out_batch, behind_node, worst_station);
-      g_log.debug() << "case 1 " << node << " inner call gave us batch: " << out_batch << " at item " << *item;
-      behind_node = GetOEnd(*item);
-      ++item;
-      ++prev_item;
+  typedef set<OutputItem> node_set;
+  typedef node_set::iterator node_mod_iter;
+  node_set nodes(output.begin(), output.end());
+  for (OutputList::const_iterator prev_item = prev_output.begin();
+       prev_item != prev_output.end(); ++prev_item) {
+    node_mod_iter find_del = nodes.find(*prev_item);
+    if (nodes.end() == find_del) {
+      g_log.debug() << "Removing prev_item " << *prev_item;
+      RemoveOutput(*prev_item, out_batch, worst_station);
     } else {
-      g_log.debug() << "CO_Update for " << node << " linear pass, case 2 (lists don't match)";
-      // Buffer both sides, and keep a lookup-set so we can identify if/when we
-      // find a node in one list that was surpassed in the other.
-      typedef set<OutputItem> node_set;
-      typedef node_set::const_iterator node_iter;
-      node_set ins_set;
-      node_set del_set;
-      OutputList::iterator ins_item = item;
-      OutputList::const_iterator del_item = prev_item;
-      while (ins_item != output.end() && del_item != prev_output.end()) {
-        g_log.debug() << "while";
-        for (node_iter i = ins_set.begin(); i != ins_set.end(); ++i) {
-          g_log.debug() << " ins set: " << *i;
-        }
-        g_log.debug() << "Looking for del item " << &*del_item << ": " << *del_item;
-        node_iter find_ins = ins_set.find(*del_item);
-        if (find_ins != ins_set.end()) {
-          // insert nodes up to find_ins
-          do {
-            g_log.debug() << "do1";
-            InsertOutput(*item, out_batch, behind_node, worst_station);
-            behind_node = GetOEnd(*item);
-            ++item;
-          } while (*find_ins != *item);
-          // then remove the nodes up to find_ins from ins_set, and advance item to find_ins+1
-            // - actually, we can just nix the ins_set, since we'll break. meh
-              // - nope?  because if we don't break and just finish the list(s(?)), we'll want to Insert/Remove the unprocessed intermediaries
-          ins_set.clear();
-          ++item;
-          // prev_item stays where it is
-          // then break
-          break;
-        }
-        for (node_iter i = del_set.begin(); i != del_set.end(); ++i) {
-          g_log.debug() << " del set: " << *i;
-        }
-        g_log.debug() << "Looking for ins item " << &*ins_item << ": " << *ins_item;
-        node_iter find_del = del_set.find(*ins_item);
-        if (find_del != del_set.end()) {
-          do {
-            g_log.debug() << "do2";
-            RemoveOutput(*prev_item, out_batch, worst_station);
-            ++prev_item;
-          } while (*find_del != *prev_item);
-          del_set.clear();
-          ++prev_item;
-          break;
-        }
-        ins_set.insert(*ins_item);
-        del_set.insert(*del_item);
-        ++ins_item;
-        ++del_item;
-        g_log.debug() << "woop";
-      }
-      // grab any remaining items in the ins_set / del_set (no-break case)
-      for (; item != ins_item; ++item) {
-        g_log.debug() << "ins wow";
-        InsertOutput(*item, out_batch, behind_node, worst_station);
-        behind_node = GetOEnd(*item);
-      }
-      for (; prev_item != del_item; ++prev_item) {
-        g_log.debug() << "del wow";
-        RemoveOutput(*prev_item, out_batch, worst_station);
-      }
-      g_log.debug() << "outwhile";
-      if (item != output.end()) {
-        g_log.debug() << " have item";
-      } else {
-        g_log.debug() << " do not have item";
-      }
-      if (prev_item != prev_output.end()) {
-        g_log.debug() << " have prev_item";
-      } else {
-        g_log.debug() << " do not have prev_item";
-      }
+      nodes.erase(find_del);
     }
   }
-  g_log.info() << " " << node << " ok...";
-  for (; item != output.end(); ++item) {
-    InsertOutput(*item, out_batch, behind_node, worst_station);
+  for (OutputList::iterator item = output.begin();
+       item != output.end(); ++item) {
+    node_mod_iter find_ins = nodes.find(*item);
+    if (nodes.end() == find_ins) {
+      g_log.debug() << "Updating item " << *item << " behind node " << behind_node;
+      UpdateOutput(*item, out_batch, behind_node, worst_station);
+    } else {
+      nodes.erase(find_ins);
+      g_log.debug() << "Inserting item " << *item << " behind node " << behind_node;
+      InsertOutput(*item, out_batch, behind_node, worst_station);
+    }
     behind_node = GetOEnd(*item);
   }
-  for (; prev_item != prev_output.end(); ++prev_item) {
-    RemoveOutput(*prev_item, out_batch, worst_station);
-  }
 
   if (output.empty()) {
     m_outputPerNode.erase(&node);
diff --git a/statik/test/Star.cpp b/statik/test/Star.cpp
index a14ec25..2726c99 100644
--- a/statik/test/Star.cpp
+++ b/statik/test/Star.cpp
@@ -107,10 +107,11 @@ void Star::run() {
       {
         Batch expected_batch;
         List xca("a", "");
+        expected_batch.Delete(ca);
         expected_batch.Insert(xca, NULL);
-        expected_batch.Delete(ca);  // why does delete come after insert?
         if (test(out_batch, expected_batch, "output")) {
-          xca_pos = out_batch.begin()->node;
+          xca_pos = (out_batch.begin()+1)->node;
+          g_log.debug() << " xca_pos: " << xca_pos;
         }
       }
       out_batch.Clear();
@@ -131,12 +132,7 @@ void Star::run() {
       test(root.GetState().GetStation(), statik::State::ST_DONE, "a");
       ip.ExtractChanges(out_batch);
       {
-        // Both items are deleted, then the remaining one is added back.
-        // That seems ok.
         Batch expected_batch;
-        List xca("a", "");
-        expected_batch.Insert(xca, NULL);
-        expected_batch.Delete(ca3);
         expected_batch.Delete(ca2);
         test(out_batch, expected_batch, "output");
       }