diff --git a/languages/jetbrains.mps.lang.typesystem2/runtime/models/jetbrains/mps/lang/typesystem2/runtime/util.mps b/languages/jetbrains.mps.lang.typesystem2/runtime/models/jetbrains/mps/lang/typesystem2/runtime/util.mps
index e722fa45..7e0b54af 100644
--- a/languages/jetbrains.mps.lang.typesystem2/runtime/models/jetbrains/mps/lang/typesystem2/runtime/util.mps
+++ b/languages/jetbrains.mps.lang.typesystem2/runtime/models/jetbrains/mps/lang/typesystem2/runtime/util.mps
@@ -780,7 +780,7 @@
       <property role="od$2w" value="false" />
       <property role="TrG5h" value="print" />
       <node concept="37vLTG" id="4peSo3CHB$z" role="3clF46">
-        <property role="TrG5h" value="root" />
+        <property role="TrG5h" value="atom" />
         <node concept="3uibUv" id="4peSo3CHBGl" role="1tU5fm">
           <ref role="3uigEE" to="ie8e:1bm7a6EXvsP" resolve="Atom" />
         </node>
@@ -802,8 +802,8 @@
         <node concept="3clFbF" id="4peSo3CILp_" role="3cqZAp">
           <node concept="1rXfSq" id="4peSo3CILpz" role="3clFbG">
             <ref role="37wK5l" node="4peSo3CIJRO" resolve="doPrint" />
-            <node concept="37vLTw" id="4peSo3CILyb" role="37wK5m">
-              <ref role="3cqZAo" node="4peSo3CHB$z" resolve="root" />
+            <node concept="37vLTw" id="6HT7BWBRhCT" role="37wK5m">
+              <ref role="3cqZAo" node="4peSo3CHB$z" resolve="atom" />
             </node>
             <node concept="2ShNRf" id="4peSo3D1xgT" role="37wK5m">
               <node concept="HV5vD" id="4peSo3D1x$v" role="2ShVmc">
@@ -836,7 +836,7 @@
       <property role="od$2w" value="false" />
       <property role="TrG5h" value="print" />
       <node concept="37vLTG" id="4peSo3D04j8" role="3clF46">
-        <property role="TrG5h" value="root" />
+        <property role="TrG5h" value="atom" />
         <node concept="3uibUv" id="4peSo3D04j9" role="1tU5fm">
           <ref role="3uigEE" to="ie8e:1bm7a6EXvsP" resolve="Atom" />
         </node>
@@ -864,8 +864,8 @@
         <node concept="3clFbF" id="4peSo3D1wNn" role="3cqZAp">
           <node concept="1rXfSq" id="4peSo3D1wNo" role="3clFbG">
             <ref role="37wK5l" node="4peSo3CIJRO" resolve="doPrint" />
-            <node concept="37vLTw" id="4peSo3D1wNp" role="37wK5m">
-              <ref role="3cqZAo" node="4peSo3D04j8" resolve="root" />
+            <node concept="37vLTw" id="6HT7BWBRh_w" role="37wK5m">
+              <ref role="3cqZAo" node="4peSo3D04j8" resolve="atom" />
             </node>
             <node concept="37vLTw" id="4peSo3D1xXE" role="37wK5m">
               <ref role="3cqZAo" node="4peSo3D075N" resolve="variableSymbol" />
@@ -896,7 +896,7 @@
       <property role="od$2w" value="false" />
       <property role="TrG5h" value="doPrint" />
       <node concept="37vLTG" id="4peSo3CIJRP" role="3clF46">
-        <property role="TrG5h" value="root" />
+        <property role="TrG5h" value="atom" />
         <node concept="3uibUv" id="4peSo3CIJRQ" role="1tU5fm">
           <ref role="3uigEE" to="ie8e:1bm7a6EXvsP" resolve="Atom" />
         </node>
@@ -927,7 +927,7 @@
                     <ref role="37wK5l" to="wyt6:~String.valueOf(java.lang.Object):java.lang.String" resolve="valueOf" />
                     <ref role="1Pybhc" to="wyt6:~String" resolve="String" />
                     <node concept="37vLTw" id="4peSo3CIJS2" role="37wK5m">
-                      <ref role="3cqZAo" node="4peSo3CIJRP" resolve="root" />
+                      <ref role="3cqZAo" node="4peSo3CIJRP" resolve="atom" />
                     </node>
                   </node>
                 </node>
@@ -944,7 +944,7 @@
               </node>
             </node>
             <node concept="37vLTw" id="4peSo3CIJS7" role="2Oq$k0">
-              <ref role="3cqZAo" node="4peSo3CIJRP" resolve="root" />
+              <ref role="3cqZAo" node="4peSo3CIJRP" resolve="atom" />
             </node>
           </node>
           <node concept="9aQIb" id="4peSo3CIJS8" role="9aQIa">
@@ -971,8 +971,12 @@
                   </node>
                   <node concept="liA8E" id="4peSo3CIJSf" role="2OqNvi">
                     <ref role="37wK5l" to="ie8e:1hOy_Afq63K" resolve="walk" />
-                    <node concept="37vLTw" id="4peSo3CIJSg" role="37wK5m">
-                      <ref role="3cqZAo" node="4peSo3CIJRP" resolve="root" />
+                    <node concept="2YIFZM" id="6HT7BWBRh6I" role="37wK5m">
+                      <ref role="37wK5l" to="ie8e:6HT7BWBOXr$" resolve="ground" />
+                      <ref role="1Pybhc" to="ie8e:6HT7BWBOXme" resolve="AtomUtil" />
+                      <node concept="37vLTw" id="6HT7BWBRhg3" role="37wK5m">
+                        <ref role="3cqZAo" node="4peSo3CIJRP" resolve="atom" />
+                      </node>
                     </node>
                   </node>
                 </node>
diff --git a/languages/jetbrains.mps.logic/runtime/models/jetbrains/mps/logic/builtin/unification.mps b/languages/jetbrains.mps.logic/runtime/models/jetbrains/mps/logic/builtin/unification.mps
index 8ecb826f..32466da2 100644
--- a/languages/jetbrains.mps.logic/runtime/models/jetbrains/mps/logic/builtin/unification.mps
+++ b/languages/jetbrains.mps.logic/runtime/models/jetbrains/mps/logic/builtin/unification.mps
@@ -4374,97 +4374,10 @@
       </node>
       <node concept="3Tm1VV" id="1Ns6gpY6DeG" role="1B3o_S" />
       <node concept="3clFbS" id="1Ns6gpY6DeH" role="3clF47">
-        <node concept="3clFbJ" id="1Ns6gpY6Kcd" role="3cqZAp">
-          <node concept="3y3z36" id="3HJTsBmTaZ8" role="3clFbw">
-            <node concept="2OqwBi" id="2DKqMqOr8nL" role="3uHU7B">
-              <node concept="1rXfSq" id="2DKqMqOr8nM" role="2Oq$k0">
-                <ref role="37wK5l" node="dfChU1gcsX" resolve="findRoot" />
-              </node>
-              <node concept="liA8E" id="2DKqMqOr8nN" role="2OqNvi">
-                <ref role="37wK5l" node="3HJTsBmBZ0h" resolve="value" />
-              </node>
-            </node>
-            <node concept="10Nm6u" id="1Ns6gpY6Kcm" role="3uHU7w" />
-          </node>
-          <node concept="3clFbS" id="3HJTsBmTaZd" role="3clFbx">
-            <node concept="3cpWs8" id="7MlQDeOykrg" role="3cqZAp">
-              <node concept="3cpWsn" id="7MlQDeOykrh" role="3cpWs9">
-                <property role="TrG5h" value="value" />
-                <node concept="3uibUv" id="7MlQDeOykrf" role="1tU5fm">
-                  <ref role="3uigEE" to="ie8e:1bm7a6EXvsP" resolve="Atom" />
-                </node>
-                <node concept="2OqwBi" id="7MlQDeOykri" role="33vP2m">
-                  <node concept="1rXfSq" id="7MlQDeOykrj" role="2Oq$k0">
-                    <ref role="37wK5l" node="dfChU1gcsX" resolve="findRoot" />
-                  </node>
-                  <node concept="liA8E" id="7MlQDeOykrk" role="2OqNvi">
-                    <ref role="37wK5l" node="3HJTsBmBZ0h" resolve="value" />
-                  </node>
-                </node>
-              </node>
-            </node>
-            <node concept="3clFbJ" id="7MlQDeOymb6" role="3cqZAp">
-              <node concept="3clFbS" id="7MlQDeOymb8" role="3clFbx">
-                <node concept="YS8fn" id="7MlQDeOyqkC" role="3cqZAp">
-                  <node concept="2ShNRf" id="7MlQDeOyqn7" role="YScLw">
-                    <node concept="1pGfFk" id="7MlQDeOyqCR" role="2ShVmc">
-                      <ref role="37wK5l" to="wyt6:~IllegalStateException.&lt;init&gt;(java.lang.String)" resolve="IllegalStateException" />
-                      <node concept="Xl_RD" id="7MlQDeOyqFs" role="37wK5m">
-                        <property role="Xl_RC" value="prorotype constraint violation" />
-                      </node>
-                    </node>
-                  </node>
-                </node>
-              </node>
-              <node concept="1Wc70l" id="7MlQDeOynKu" role="3clFbw">
-                <node concept="3fqX7Q" id="7MlQDeOynZ5" role="3uHU7w">
-                  <node concept="2OqwBi" id="7MlQDeOyofF" role="3fr31v">
-                    <node concept="37vLTw" id="7MlQDeOyo4F" role="2Oq$k0">
-                      <ref role="3cqZAo" node="7MlQDeOyfvd" resolve="prototype" />
-                    </node>
-                    <node concept="liA8E" id="7MlQDeOyoS3" role="2OqNvi">
-                      <ref role="37wK5l" to="wyt6:~Class.isAssignableFrom(java.lang.Class):boolean" resolve="isAssignableFrom" />
-                      <node concept="2OqwBi" id="7MlQDeOyplw" role="37wK5m">
-                        <node concept="37vLTw" id="7MlQDeOypaK" role="2Oq$k0">
-                          <ref role="3cqZAo" node="7MlQDeOykrh" resolve="value" />
-                        </node>
-                        <node concept="liA8E" id="7MlQDeOypR3" role="2OqNvi">
-                          <ref role="37wK5l" to="wyt6:~Object.getClass():java.lang.Class" resolve="getClass" />
-                        </node>
-                      </node>
-                    </node>
-                  </node>
-                </node>
-                <node concept="3y3z36" id="7MlQDeOynuH" role="3uHU7B">
-                  <node concept="37vLTw" id="7MlQDeOyn9R" role="3uHU7B">
-                    <ref role="3cqZAo" node="7MlQDeOyfvd" resolve="prototype" />
-                  </node>
-                  <node concept="10Nm6u" id="7MlQDeOyny8" role="3uHU7w" />
-                </node>
-              </node>
-            </node>
-            <node concept="3clFbH" id="7MlQDeOyli0" role="3cqZAp" />
-            <node concept="3cpWs6" id="3HJTsBmTdN1" role="3cqZAp">
-              <node concept="37vLTw" id="7MlQDeOykrl" role="3cqZAk">
-                <ref role="3cqZAo" node="7MlQDeOykrh" resolve="value" />
-              </node>
-            </node>
-            <node concept="3clFbH" id="2DKqMqOr9f7" role="3cqZAp" />
-          </node>
-          <node concept="9aQIb" id="2DKqMqOra27" role="9aQIa">
-            <node concept="3clFbS" id="2DKqMqOra28" role="9aQI4">
-              <node concept="3SKdUt" id="1Ns6gpY6Kcf" role="3cqZAp">
-                <node concept="3SKdUq" id="1Ns6gpY6Kcg" role="3SKWNk">
-                  <property role="3SKdUp" value="construct a new tree variable" />
-                </node>
-              </node>
-              <node concept="3cpWs6" id="1Ns6gpY6Kch" role="3cqZAp">
-                <node concept="2ShNRf" id="1Ns6gpY6Kci" role="3cqZAk">
-                  <node concept="1pGfFk" id="1Ns6gpY6Kcj" role="2ShVmc">
-                    <ref role="37wK5l" node="3HJTsBmSn3o" resolve="AtomLogical.AtomLogicalVar" />
-                  </node>
-                </node>
-              </node>
+        <node concept="3cpWs6" id="1Ns6gpY6Kch" role="3cqZAp">
+          <node concept="2ShNRf" id="1Ns6gpY6Kci" role="3cqZAk">
+            <node concept="1pGfFk" id="1Ns6gpY6Kcj" role="2ShVmc">
+              <ref role="37wK5l" node="3HJTsBmSn3o" resolve="AtomLogical.AtomLogicalVar" />
             </node>
           </node>
         </node>
@@ -4817,6 +4730,80 @@
       </node>
     </node>
     <node concept="2tJIrI" id="2h41Ezbxe8N" role="jymVt" />
+    <node concept="3clFb_" id="6HT7BWBMwRc" role="jymVt">
+      <property role="TrG5h" value="atomValue" />
+      <property role="1EzhhJ" value="false" />
+      <node concept="3uibUv" id="6HT7BWBNHCx" role="3clF45">
+        <ref role="3uigEE" to="ie8e:1bm7a6EXvsP" resolve="Atom" />
+      </node>
+      <node concept="3Tmbuc" id="6HT7BWBMwRg" role="1B3o_S" />
+      <node concept="3clFbS" id="6HT7BWBMwRp" role="3clF47">
+        <node concept="3cpWs8" id="6HT7BWBNRfv" role="3cqZAp">
+          <node concept="3cpWsn" id="6HT7BWBNRfw" role="3cpWs9">
+            <property role="TrG5h" value="val" />
+            <node concept="3uibUv" id="6HT7BWBNRfu" role="1tU5fm">
+              <ref role="3uigEE" to="ie8e:1bm7a6EXvsP" resolve="Atom" />
+            </node>
+            <node concept="2OqwBi" id="6HT7BWBNRfx" role="33vP2m">
+              <node concept="1rXfSq" id="6HT7BWBNRfy" role="2Oq$k0">
+                <ref role="37wK5l" node="dfChU1gcsX" resolve="findRoot" />
+              </node>
+              <node concept="liA8E" id="6HT7BWBNRfz" role="2OqNvi">
+                <ref role="37wK5l" node="3HJTsBmBZ0h" resolve="value" />
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="3clFbJ" id="6HT7BWBMzt1" role="3cqZAp">
+          <property role="TyiWK" value="true" />
+          <property role="TyiWL" value="false" />
+          <node concept="3clFbS" id="6HT7BWBMzt2" role="3clFbx">
+            <node concept="YS8fn" id="6HT7BWBMzt3" role="3cqZAp">
+              <node concept="2ShNRf" id="6HT7BWBMzt4" role="YScLw">
+                <node concept="1pGfFk" id="6HT7BWBMzt5" role="2ShVmc">
+                  <ref role="37wK5l" to="wyt6:~IllegalStateException.&lt;init&gt;(java.lang.String)" resolve="IllegalStateException" />
+                  <node concept="Xl_RD" id="6HT7BWBMzt6" role="37wK5m">
+                    <property role="Xl_RC" value="prorotype constraint violation" />
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="1Wc70l" id="6HT7BWBMzt7" role="3clFbw">
+            <node concept="3fqX7Q" id="6HT7BWBMzt8" role="3uHU7w">
+              <node concept="2OqwBi" id="6HT7BWBMzt9" role="3fr31v">
+                <node concept="37vLTw" id="6HT7BWBMzta" role="2Oq$k0">
+                  <ref role="3cqZAo" node="7MlQDeOyfvd" resolve="prototype" />
+                </node>
+                <node concept="liA8E" id="6HT7BWBMztb" role="2OqNvi">
+                  <ref role="37wK5l" to="wyt6:~Class.isAssignableFrom(java.lang.Class):boolean" resolve="isAssignableFrom" />
+                  <node concept="2OqwBi" id="6HT7BWBMztc" role="37wK5m">
+                    <node concept="37vLTw" id="6HT7BWBNSwT" role="2Oq$k0">
+                      <ref role="3cqZAo" node="6HT7BWBNRfw" resolve="val" />
+                    </node>
+                    <node concept="liA8E" id="6HT7BWBMzte" role="2OqNvi">
+                      <ref role="37wK5l" to="wyt6:~Object.getClass():java.lang.Class" resolve="getClass" />
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+            <node concept="3y3z36" id="6HT7BWBMztf" role="3uHU7B">
+              <node concept="37vLTw" id="6HT7BWBMztg" role="3uHU7B">
+                <ref role="3cqZAo" node="7MlQDeOyfvd" resolve="prototype" />
+              </node>
+              <node concept="10Nm6u" id="6HT7BWBMzth" role="3uHU7w" />
+            </node>
+          </node>
+        </node>
+        <node concept="3clFbF" id="6HT7BWBNT7e" role="3cqZAp">
+          <node concept="37vLTw" id="6HT7BWBNT7c" role="3clFbG">
+            <ref role="3cqZAo" node="6HT7BWBNRfw" resolve="val" />
+          </node>
+        </node>
+      </node>
+    </node>
+    <node concept="2tJIrI" id="6HT7BWBMyhy" role="jymVt" />
     <node concept="312cEu" id="3HJTsBmSn3l" role="jymVt">
       <property role="TrG5h" value="AtomLogicalVar" />
       <property role="2bfB8j" value="true" />
@@ -4849,9 +4836,10 @@
             <node concept="3clFbS" id="2h41EzbxGVI" role="3clFbx">
               <node concept="3cpWs6" id="2h41EzbxJTK" role="3cqZAp">
                 <node concept="1rXfSq" id="2h41EzbxKA7" role="3cqZAk">
-                  <ref role="37wK5l" node="1Ns6gpY6DeD" resolve="asAtom" />
+                  <ref role="37wK5l" node="6HT7BWBMwRc" resolve="atomValue" />
                 </node>
               </node>
+              <node concept="3clFbH" id="6HT7BWBPJuI" role="3cqZAp" />
             </node>
             <node concept="1rXfSq" id="2h41EzbxGYR" role="3clFbw">
               <ref role="37wK5l" node="3HJTsBmC6RD" resolve="isBound" />
@@ -4898,6 +4886,7 @@
                   </node>
                 </node>
               </node>
+              <node concept="3clFbH" id="6HT7BWBQgbR" role="3cqZAp" />
             </node>
             <node concept="1rXfSq" id="2h41EzbxNuf" role="3clFbw">
               <ref role="37wK5l" node="3HJTsBmC6RD" resolve="isBound" />
@@ -5453,49 +5442,10 @@
       </node>
       <node concept="3Tm1VV" id="7jC45KciagJ" role="1B3o_S" />
       <node concept="3clFbS" id="7jC45KciagQ" role="3clF47">
-        <node concept="3clFbJ" id="7jC45KciiRU" role="3cqZAp">
-          <node concept="3clFbS" id="7jC45KciiRW" role="3clFbx">
-            <node concept="3cpWs6" id="7jC45KcijDi" role="3cqZAp">
-              <node concept="2YIFZM" id="7jC45KcikLk" role="3cqZAk">
-                <ref role="37wK5l" to="ie8e:5JQSuNsxb_I" resolve="create" />
-                <ref role="1Pybhc" to="ie8e:2xQ7eRAD2dj" resolve="Value" />
-                <node concept="2OqwBi" id="2DKqMqOrdpP" role="37wK5m">
-                  <node concept="1rXfSq" id="2DKqMqOrdpQ" role="2Oq$k0">
-                    <ref role="37wK5l" node="dfChU1gi$L" resolve="findRoot" />
-                  </node>
-                  <node concept="liA8E" id="2DKqMqOrdpR" role="2OqNvi">
-                    <ref role="37wK5l" node="3HJTsBmBZ0h" resolve="value" />
-                  </node>
-                </node>
-              </node>
-            </node>
-            <node concept="3clFbH" id="2DKqMqOrewZ" role="3cqZAp" />
-          </node>
-          <node concept="3y3z36" id="7jC45KcijoX" role="3clFbw">
-            <node concept="10Nm6u" id="7jC45Kcijx5" role="3uHU7w" />
-            <node concept="2OqwBi" id="2DKqMqOrdpS" role="3uHU7B">
-              <node concept="1rXfSq" id="2DKqMqOrdpT" role="2Oq$k0">
-                <ref role="37wK5l" node="dfChU1gi$L" resolve="findRoot" />
-              </node>
-              <node concept="liA8E" id="2DKqMqOrdpU" role="2OqNvi">
-                <ref role="37wK5l" node="3HJTsBmBZ0h" resolve="value" />
-              </node>
-            </node>
-          </node>
-          <node concept="9aQIb" id="2DKqMqOrdZJ" role="9aQIa">
-            <node concept="3clFbS" id="2DKqMqOrdZK" role="9aQI4">
-              <node concept="3SKdUt" id="2DKqMqOrgdt" role="3cqZAp">
-                <node concept="3SKdUq" id="2DKqMqOrgdu" role="3SKWNk">
-                  <property role="3SKdUp" value="construct a new tree variable" />
-                </node>
-              </node>
-              <node concept="3cpWs6" id="7jC45KciLiJ" role="3cqZAp">
-                <node concept="2ShNRf" id="7jC45KciM65" role="3cqZAk">
-                  <node concept="1pGfFk" id="7jC45KciN1y" role="2ShVmc">
-                    <ref role="37wK5l" node="7jC45Kciqer" resolve="StringLogical.StringLogicalVar" />
-                  </node>
-                </node>
-              </node>
+        <node concept="3cpWs6" id="7jC45KciLiJ" role="3cqZAp">
+          <node concept="2ShNRf" id="7jC45KciM65" role="3cqZAk">
+            <node concept="1pGfFk" id="7jC45KciN1y" role="2ShVmc">
+              <ref role="37wK5l" node="7jC45Kciqer" resolve="StringLogical.StringLogicalVar" />
             </node>
           </node>
         </node>
@@ -5680,6 +5630,30 @@
         <ref role="2AI5Lk" to="wyt6:~Override" resolve="Override" />
       </node>
     </node>
+    <node concept="2tJIrI" id="6HT7BWBPABJ" role="jymVt" />
+    <node concept="3clFb_" id="6HT7BWBPBnJ" role="jymVt">
+      <property role="TrG5h" value="atomValue" />
+      <node concept="3uibUv" id="6HT7BWBPRdK" role="3clF45">
+        <ref role="3uigEE" to="ie8e:2xQ7eRAD2dj" resolve="Value" />
+      </node>
+      <node concept="3Tmbuc" id="6HT7BWBPBZC" role="1B3o_S" />
+      <node concept="3clFbS" id="6HT7BWBPBnN" role="3clF47">
+        <node concept="3clFbF" id="6HT7BWBPT4U" role="3cqZAp">
+          <node concept="2YIFZM" id="6HT7BWBPT91" role="3clFbG">
+            <ref role="37wK5l" to="ie8e:5JQSuNsxb_I" resolve="create" />
+            <ref role="1Pybhc" to="ie8e:2xQ7eRAD2dj" resolve="Value" />
+            <node concept="2OqwBi" id="6HT7BWBPFFL" role="37wK5m">
+              <node concept="1rXfSq" id="6HT7BWBPEIF" role="2Oq$k0">
+                <ref role="37wK5l" node="dfChU1gi$L" resolve="findRoot" />
+              </node>
+              <node concept="liA8E" id="6HT7BWBPGVx" role="2OqNvi">
+                <ref role="37wK5l" node="3HJTsBmBZ0h" resolve="value" />
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+    </node>
     <node concept="2tJIrI" id="7jC45KcinQd" role="jymVt" />
     <node concept="312cEu" id="7jC45KcioOY" role="jymVt">
       <property role="2bfB8j" value="true" />
@@ -5700,6 +5674,97 @@
         </node>
       </node>
       <node concept="2tJIrI" id="7jC45KciJeE" role="jymVt" />
+      <node concept="3clFb_" id="6HT7BWBPzSO" role="jymVt">
+        <property role="1EzhhJ" value="false" />
+        <property role="TrG5h" value="get" />
+        <property role="DiZV1" value="false" />
+        <property role="od$2w" value="false" />
+        <node concept="3Tm1VV" id="6HT7BWBPzSP" role="1B3o_S" />
+        <node concept="3uibUv" id="6HT7BWBPzSQ" role="3clF45">
+          <ref role="3uigEE" to="yt73:~Term" resolve="Term" />
+        </node>
+        <node concept="2AHcQZ" id="6HT7BWBPzSU" role="2AJF6D">
+          <ref role="2AI5Lk" to="wyt6:~Override" resolve="Override" />
+        </node>
+        <node concept="3clFbS" id="6HT7BWBPzSV" role="3clF47">
+          <node concept="3clFbJ" id="6HT7BWBPIxl" role="3cqZAp">
+            <node concept="3clFbS" id="6HT7BWBPIxm" role="3clFbx">
+              <node concept="3cpWs6" id="6HT7BWBPJjF" role="3cqZAp">
+                <node concept="1rXfSq" id="6HT7BWBPJ4i" role="3cqZAk">
+                  <ref role="37wK5l" node="6HT7BWBPBnJ" resolve="atomValue" />
+                </node>
+              </node>
+              <node concept="3clFbH" id="6HT7BWBPL84" role="3cqZAp" />
+            </node>
+            <node concept="1rXfSq" id="6HT7BWBPIB1" role="3clFbw">
+              <ref role="37wK5l" node="3HJTsBmC6RD" resolve="isBound" />
+            </node>
+            <node concept="9aQIb" id="6HT7BWBPKuY" role="9aQIa">
+              <node concept="3clFbS" id="6HT7BWBPKuZ" role="9aQI4">
+                <node concept="3cpWs6" id="6HT7BWBPLOV" role="3cqZAp">
+                  <node concept="Xjq3P" id="6HT7BWBPMfM" role="3cqZAk" />
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="2tJIrI" id="6HT7BWBP_oA" role="jymVt" />
+      <node concept="3clFb_" id="6HT7BWBR7aw" role="jymVt">
+        <property role="1EzhhJ" value="false" />
+        <property role="TrG5h" value="is" />
+        <property role="DiZV1" value="false" />
+        <property role="od$2w" value="false" />
+        <node concept="3Tm1VV" id="6HT7BWBR7ax" role="1B3o_S" />
+        <node concept="37vLTG" id="6HT7BWBR7ay" role="3clF46">
+          <property role="TrG5h" value="kind" />
+          <property role="3TUv4t" value="false" />
+          <node concept="3uibUv" id="6HT7BWBR7az" role="1tU5fm">
+            <ref role="3uigEE" to="yt73:~Term.Kind" resolve="Term.Kind" />
+          </node>
+        </node>
+        <node concept="10P_77" id="6HT7BWBR7a$" role="3clF45" />
+        <node concept="2AHcQZ" id="6HT7BWBR7aE" role="2AJF6D">
+          <ref role="2AI5Lk" to="wyt6:~Override" resolve="Override" />
+        </node>
+        <node concept="3clFbS" id="6HT7BWBR7aF" role="3clF47">
+          <node concept="3clFbJ" id="6HT7BWBR9uO" role="3cqZAp">
+            <node concept="3clFbS" id="6HT7BWBR9uP" role="3clFbx">
+              <node concept="3cpWs6" id="6HT7BWBR9uQ" role="3cqZAp">
+                <node concept="3clFbC" id="6HT7BWBR9uR" role="3cqZAk">
+                  <node concept="37vLTw" id="6HT7BWBR9uS" role="3uHU7w">
+                    <ref role="3cqZAo" node="6HT7BWBR7ay" resolve="kind" />
+                  </node>
+                  <node concept="Rm8GO" id="6HT7BWBR9uT" role="3uHU7B">
+                    <ref role="1Px2BO" to="yt73:~Term.Kind" resolve="Term.Kind" />
+                    <ref role="Rm8GQ" to="yt73:~Term.REF" resolve="REF" />
+                  </node>
+                </node>
+              </node>
+              <node concept="3clFbH" id="6HT7BWBR9uU" role="3cqZAp" />
+            </node>
+            <node concept="1rXfSq" id="6HT7BWBR9uV" role="3clFbw">
+              <ref role="37wK5l" node="3HJTsBmC6RD" resolve="isBound" />
+            </node>
+            <node concept="9aQIb" id="6HT7BWBR9uW" role="9aQIa">
+              <node concept="3clFbS" id="6HT7BWBR9uX" role="9aQI4">
+                <node concept="3cpWs6" id="6HT7BWBR9uY" role="3cqZAp">
+                  <node concept="3clFbC" id="6HT7BWBR9uZ" role="3cqZAk">
+                    <node concept="37vLTw" id="6HT7BWBR9v0" role="3uHU7w">
+                      <ref role="3cqZAo" node="6HT7BWBR7ay" resolve="kind" />
+                    </node>
+                    <node concept="Rm8GO" id="6HT7BWBR9v1" role="3uHU7B">
+                      <ref role="1Px2BO" to="yt73:~Term.Kind" resolve="Term.Kind" />
+                      <ref role="Rm8GQ" to="yt73:~Term.VAR" resolve="VAR" />
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="2tJIrI" id="6HT7BWBR7Tb" role="jymVt" />
       <node concept="3clFb_" id="7jC45Kcis37" role="jymVt">
         <property role="TrG5h" value="logical" />
         <node concept="3uibUv" id="7jC45Kciscl" role="3clF45">
diff --git a/languages/jetbrains.mps.logic/solutions/jetbrains.mps.logic.atom/models/jetbrains/mps/logic/atom.mps b/languages/jetbrains.mps.logic/solutions/jetbrains.mps.logic.atom/models/jetbrains/mps/logic/atom.mps
index 06a6882f..e78e5e40 100644
--- a/languages/jetbrains.mps.logic/solutions/jetbrains.mps.logic.atom/models/jetbrains/mps/logic/atom.mps
+++ b/languages/jetbrains.mps.logic/solutions/jetbrains.mps.logic.atom/models/jetbrains/mps/logic/atom.mps
@@ -52,9 +52,6 @@
       <concept id="1154032098014" name="jetbrains.mps.baseLanguage.structure.AbstractLoopStatement" flags="nn" index="2LF5Ji">
         <child id="1154032183016" name="body" index="2LFqv$" />
       </concept>
-      <concept id="1177666668936" name="jetbrains.mps.baseLanguage.structure.DoWhileStatement" flags="nn" index="MpOyq">
-        <child id="1177666688034" name="condition" index="MpTkK" />
-      </concept>
       <concept id="1197027756228" name="jetbrains.mps.baseLanguage.structure.DotExpression" flags="nn" index="2OqwBi">
         <child id="1197027771414" name="operand" index="2Oq$k0" />
         <child id="1197027833540" name="operation" index="2OqNvi" />
@@ -72,9 +69,17 @@
         <reference id="1083260308426" name="enumConstantDeclaration" index="Rm8GQ" />
         <reference id="1144432896254" name="enumClass" index="1Px2BO" />
       </concept>
+      <concept id="1164879751025" name="jetbrains.mps.baseLanguage.structure.TryCatchStatement" flags="nn" index="SfApY">
+        <child id="1164879758292" name="body" index="SfCbr" />
+        <child id="1164903496223" name="catchClause" index="TEbGg" />
+      </concept>
       <concept id="1145552977093" name="jetbrains.mps.baseLanguage.structure.GenericNewExpression" flags="nn" index="2ShNRf">
         <child id="1145553007750" name="creator" index="2ShVmc" />
       </concept>
+      <concept id="1164903280175" name="jetbrains.mps.baseLanguage.structure.CatchClause" flags="nn" index="TDmWw">
+        <child id="1164903359218" name="catchBody" index="TDEfX" />
+        <child id="1164903359217" name="throwable" index="TDEfY" />
+      </concept>
       <concept id="1070462154015" name="jetbrains.mps.baseLanguage.structure.StaticFieldDeclaration" flags="ig" index="Wx3nA" />
       <concept id="1070475354124" name="jetbrains.mps.baseLanguage.structure.ThisExpression" flags="nn" index="Xjq3P" />
       <concept id="1070475587102" name="jetbrains.mps.baseLanguage.structure.SuperConstructorInvocation" flags="nn" index="XkiVB" />
@@ -269,7 +274,6 @@
         <child id="1163670677455" name="expression" index="3Kbmr1" />
         <child id="1163670683720" name="body" index="3Kbo56" />
       </concept>
-      <concept id="1082113931046" name="jetbrains.mps.baseLanguage.structure.ContinueStatement" flags="nn" index="3N13vt" />
       <concept id="1208890769693" name="jetbrains.mps.baseLanguage.structure.ArrayLengthOperation" flags="nn" index="1Rwk04" />
       <concept id="6329021646629104957" name="jetbrains.mps.baseLanguage.structure.TextCommentPart" flags="nn" index="3SKdUq">
         <property id="6329021646629104958" name="text" index="3SKdUp" />
@@ -280,6 +284,9 @@
       <concept id="1146644602865" name="jetbrains.mps.baseLanguage.structure.PublicVisibility" flags="nn" index="3Tm1VV" />
       <concept id="1146644623116" name="jetbrains.mps.baseLanguage.structure.PrivateVisibility" flags="nn" index="3Tm6S6" />
       <concept id="1146644641414" name="jetbrains.mps.baseLanguage.structure.ProtectedVisibility" flags="nn" index="3Tmbuc" />
+      <concept id="1116615150612" name="jetbrains.mps.baseLanguage.structure.ClassifierClassExpression" flags="nn" index="3VsKOn">
+        <reference id="1116615189566" name="classifier" index="3VsUkX" />
+      </concept>
       <concept id="1080120340718" name="jetbrains.mps.baseLanguage.structure.AndExpression" flags="nn" index="1Wc70l" />
       <concept id="1170345865475" name="jetbrains.mps.baseLanguage.structure.AnonymousClass" flags="ig" index="1Y3b0j">
         <reference id="1170346070688" name="classifier" index="1Y3XeK" />
@@ -1001,10 +1008,7 @@
             <property role="TrG5h" value="values" />
             <node concept="10Q1$e" id="3OPtF02U4BI" role="1tU5fm">
               <node concept="3uibUv" id="3OPtF02U4BL" role="10Q1$1">
-                <ref role="3uigEE" node="2xQ7eRAD2dj" resolve="Value" />
-                <node concept="16syzq" id="3OPtF02U5t7" role="11_B2D">
-                  <ref role="16sUi3" node="1msb0mq99K4" resolve="V" />
-                </node>
+                <ref role="3uigEE" node="1bm7a6EXvsP" resolve="Atom" />
               </node>
             </node>
             <node concept="2ShNRf" id="3OPtF02U4Cb" role="33vP2m">
@@ -1014,8 +1018,8 @@
                     <ref role="37wK5l" node="6$jH9oLbZOI" resolve="argsSize" />
                   </node>
                 </node>
-                <node concept="3uibUv" id="3OPtF02U4Ch" role="3$_nBY">
-                  <ref role="3uigEE" node="2xQ7eRAD2dj" resolve="Value" />
+                <node concept="3uibUv" id="6HT7BWBR3BH" role="3$_nBY">
+                  <ref role="3uigEE" node="1bm7a6EXvsP" resolve="Atom" />
                 </node>
               </node>
             </node>
@@ -1025,24 +1029,16 @@
           <node concept="3clFbS" id="3OPtF02U80C" role="2LFqv$">
             <node concept="3clFbF" id="3OPtF02UcQK" role="3cqZAp">
               <node concept="37vLTI" id="3OPtF02UdGm" role="3clFbG">
-                <node concept="10QFUN" id="5s497VqMFY_" role="37vLTx">
-                  <node concept="3uibUv" id="5s497VqMFYu" role="10QFUM">
-                    <ref role="3uigEE" node="2xQ7eRAD2dj" resolve="Value" />
-                    <node concept="16syzq" id="5s497VqMFYv" role="11_B2D">
-                      <ref role="16sUi3" node="1msb0mq99K4" resolve="V" />
-                    </node>
+                <node concept="2OqwBi" id="5s497VqMFYw" role="37vLTx">
+                  <node concept="37vLTw" id="5s497VqMFYx" role="2Oq$k0">
+                    <ref role="3cqZAo" node="3OPtF02TY7L" resolve="mapper" />
                   </node>
-                  <node concept="2OqwBi" id="5s497VqMFYw" role="10QFUP">
-                    <node concept="37vLTw" id="5s497VqMFYx" role="2Oq$k0">
-                      <ref role="3cqZAo" node="3OPtF02TY7L" resolve="mapper" />
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-                    <node concept="liA8E" id="5s497VqMFYy" role="2OqNvi">
-                      <ref role="37wK5l" node="3OPtF02TgQt" resolve="map" />
-                      <node concept="1rXfSq" id="5s497VqMFYz" role="37wK5m">
-                        <ref role="37wK5l" node="6$jH9oLbK0n" resolve="argAt" />
-                        <node concept="37vLTw" id="5s497VqMFY$" role="37wK5m">
-                          <ref role="3cqZAo" node="3OPtF02U80F" resolve="i" />
-                        </node>
+                  <node concept="liA8E" id="5s497VqMFYy" role="2OqNvi">
+                    <ref role="37wK5l" node="3OPtF02TgQt" resolve="map" />
+                    <node concept="1rXfSq" id="5s497VqMFYz" role="37wK5m">
+                      <ref role="37wK5l" node="6$jH9oLbK0n" resolve="argAt" />
+                      <node concept="37vLTw" id="5s497VqMFY$" role="37wK5m">
+                        <ref role="3cqZAo" node="3OPtF02U80F" resolve="i" />
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@@ -4352,6 +4348,163 @@
         <node concept="3Tm1VV" id="104EUzFOASs" role="1B3o_S" />
         <node concept="3clFbS" id="104EUzFOASt" role="3clF47" />
       </node>
+      <node concept="2tJIrI" id="6HT7BWBQcuz" role="jymVt" />
+      <node concept="312cEu" id="6HT7BWBQcxv" role="jymVt">
+        <property role="TrG5h" value="Stub" />
+        <node concept="2tJIrI" id="6HT7BWBQcN0" role="jymVt" />
+        <node concept="3clFb_" id="6HT7BWBQcNL" role="jymVt">
+          <property role="1EzhhJ" value="false" />
+          <property role="TrG5h" value="visitTerms" />
+          <node concept="3uibUv" id="6HT7BWBQcNM" role="3clF45">
+            <ref role="3uigEE" to="wyt6:~Object" resolve="Object" />
+          </node>
+          <node concept="3Tm1VV" id="6HT7BWBQcNN" role="1B3o_S" />
+          <node concept="37vLTG" id="6HT7BWBQcNP" role="3clF46">
+            <property role="TrG5h" value="terms" />
+            <node concept="3uibUv" id="6HT7BWBQcNQ" role="1tU5fm">
+              <ref role="3uigEE" node="5JQSuNswOXL" resolve="TermFunc" />
+            </node>
+          </node>
+          <node concept="3clFbS" id="6HT7BWBQcNR" role="3clF47">
+            <node concept="3clFbF" id="6HT7BWBQcNT" role="3cqZAp">
+              <node concept="10Nm6u" id="6HT7BWBQcNS" role="3clFbG" />
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+          </node>
+          <node concept="2AHcQZ" id="6HT7BWBQd0T" role="2AJF6D">
+            <ref role="2AI5Lk" to="wyt6:~Override" resolve="Override" />
+          </node>
+        </node>
+        <node concept="3clFb_" id="6HT7BWBQcNU" role="jymVt">
+          <property role="1EzhhJ" value="false" />
+          <property role="TrG5h" value="visitValues" />
+          <node concept="37vLTG" id="6HT7BWBQcNV" role="3clF46">
+            <property role="TrG5h" value="values" />
+            <node concept="3uibUv" id="6HT7BWBQcNW" role="1tU5fm">
+              <ref role="3uigEE" node="1msb0mq99GH" resolve="ValueFunc" />
+              <node concept="16syzq" id="6HT7BWBQcNX" role="11_B2D">
+                <ref role="16sUi3" node="6HT7BWBQcO1" resolve="V" />
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+          <node concept="3uibUv" id="6HT7BWBQcNY" role="3clF45">
+            <ref role="3uigEE" to="wyt6:~Object" resolve="Object" />
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+          <node concept="3Tm1VV" id="6HT7BWBQcNZ" role="1B3o_S" />
+          <node concept="16euLQ" id="6HT7BWBQcO1" role="16eVyc">
+            <property role="TrG5h" value="V" />
+          </node>
+          <node concept="3clFbS" id="6HT7BWBQcO2" role="3clF47">
+            <node concept="3clFbF" id="6HT7BWBQcO4" role="3cqZAp">
+              <node concept="10Nm6u" id="6HT7BWBQcO3" role="3clFbG" />
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+          </node>
+          <node concept="2AHcQZ" id="6HT7BWBQd4X" role="2AJF6D">
+            <ref role="2AI5Lk" to="wyt6:~Override" resolve="Override" />
+          </node>
+        </node>
+        <node concept="3clFb_" id="6HT7BWBQcO5" role="jymVt">
+          <property role="1EzhhJ" value="false" />
+          <property role="TrG5h" value="visitVariables" />
+          <property role="IEkAT" value="false" />
+          <node concept="37vLTG" id="6HT7BWBQcO6" role="3clF46">
+            <property role="TrG5h" value="variables" />
+            <node concept="3uibUv" id="6HT7BWBQcO7" role="1tU5fm">
+              <ref role="3uigEE" node="uNmovXiSQ6" resolve="VariableFunc" />
+            </node>
+          </node>
+          <node concept="3uibUv" id="6HT7BWBQcO8" role="3clF45">
+            <ref role="3uigEE" to="wyt6:~Object" resolve="Object" />
+          </node>
+          <node concept="3Tm1VV" id="6HT7BWBQcO9" role="1B3o_S" />
+          <node concept="2AHcQZ" id="6HT7BWBQcOb" role="2AJF6D">
+            <ref role="2AI5Lk" to="wyt6:~Deprecated" resolve="Deprecated" />
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+          <node concept="3clFbS" id="6HT7BWBQcOc" role="3clF47">
+            <node concept="3clFbF" id="6HT7BWBQcOe" role="3cqZAp">
+              <node concept="10Nm6u" id="6HT7BWBQcOd" role="3clFbG" />
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+          <node concept="2AHcQZ" id="6HT7BWBQd8Z" role="2AJF6D">
+            <ref role="2AI5Lk" to="wyt6:~Override" resolve="Override" />
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+        </node>
+        <node concept="3clFb_" id="6HT7BWBQcOf" role="jymVt">
+          <property role="1EzhhJ" value="false" />
+          <property role="TrG5h" value="visitList" />
+          <node concept="3uibUv" id="6HT7BWBQcOg" role="3clF45">
+            <ref role="3uigEE" to="wyt6:~Object" resolve="Object" />
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+          <node concept="3Tm1VV" id="6HT7BWBQcOh" role="1B3o_S" />
+          <node concept="37vLTG" id="6HT7BWBQcOj" role="3clF46">
+            <property role="TrG5h" value="list" />
+            <node concept="3uibUv" id="6HT7BWBQcOk" role="1tU5fm">
+              <ref role="3uigEE" node="3OPtF03lco4" resolve="ListFunc" />
+            </node>
+          </node>
+          <node concept="3clFbS" id="6HT7BWBQcOl" role="3clF47">
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+          </node>
+          <node concept="2AHcQZ" id="6HT7BWBQdd0" role="2AJF6D">
+            <ref role="2AI5Lk" to="wyt6:~Override" resolve="Override" />
+          </node>
+        </node>
+        <node concept="3clFb_" id="6HT7BWBQcOo" role="jymVt">
+          <property role="1EzhhJ" value="false" />
+          <property role="TrG5h" value="visitValue" />
+          <node concept="37vLTG" id="6HT7BWBQcOp" role="3clF46">
+            <property role="TrG5h" value="value" />
+            <node concept="3uibUv" id="6HT7BWBQcOq" role="1tU5fm">
+              <ref role="3uigEE" node="2xQ7eRAD2dj" resolve="Value" />
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+          <node concept="3uibUv" id="6HT7BWBQcOs" role="3clF45">
+            <ref role="3uigEE" to="wyt6:~Object" resolve="Object" />
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+          <node concept="2AHcQZ" id="6HT7BWBQdh4" role="2AJF6D">
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+          </node>
+        </node>
+        <node concept="3clFb_" id="6HT7BWBQcOz" role="jymVt">
+          <property role="1EzhhJ" value="false" />
+          <property role="TrG5h" value="visitVariable" />
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+            <property role="TrG5h" value="variable" />
+            <node concept="3uibUv" id="6HT7BWBQcO_" role="1tU5fm">
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+          <node concept="3clFbS" id="6HT7BWBQcOD" role="3clF47">
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+          <node concept="2AHcQZ" id="6HT7BWBQdl4" role="2AJF6D">
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@@ -7559,916 +7712,6 @@
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-                            <ref role="3uigEE" node="1msb0mq9ID4" resolve="Func" />
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-                          <node concept="37vLTw" id="5s497VqD7pq" role="10QFUP">
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-              <node concept="37vLTw" id="5s497VqCY3W" role="2ZW6bz">
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-                <ref role="3cqZAo" node="5s497VqCQ9o" resolve="tp" />
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-                  <ref role="3cqZAo" node="3OPtF02YFAm" resolve="terms" />
-                </node>
-                <node concept="liA8E" id="3OPtF031Aul" role="2OqNvi">
-                  <ref role="37wK5l" node="1R$Cm9qGRoH" resolve="symbol" />
-                </node>
-              </node>
-              <node concept="37vLTw" id="3OPtF031AZa" role="3uHU7w">
-                <ref role="3cqZAo" node="3OPtF031_11" resolve="symbol" />
-              </node>
-            </node>
-            <node concept="9aQIb" id="3OPtF031B9h" role="9aQIa">
-              <node concept="3clFbS" id="3OPtF031B9i" role="9aQI4">
-                <node concept="3cpWs6" id="3OPtF031Be_" role="3cqZAp">
-                  <node concept="2OqwBi" id="3OPtF031C1b" role="3cqZAk">
-                    <node concept="37vLTw" id="3OPtF031BC$" role="2Oq$k0">
-                      <ref role="3cqZAo" node="3OPtF02YFAm" resolve="terms" />
-                    </node>
-                    <node concept="liA8E" id="3OPtF031C$7" role="2OqNvi">
-                      <ref role="37wK5l" node="3OPtF02T_i3" resolve="mapRecursively" />
-                      <node concept="Xjq3P" id="5s497VqP5rL" role="37wK5m" />
-                    </node>
-                  </node>
-                </node>
-              </node>
-            </node>
-          </node>
-        </node>
-        <node concept="2AHcQZ" id="5s497VqvzNz" role="2AJF6D">
-          <ref role="2AI5Lk" to="wyt6:~Override" resolve="Override" />
-        </node>
-      </node>
-      <node concept="2tJIrI" id="3OPtF030ZQS" role="jymVt" />
-      <node concept="3clFb_" id="3OPtF03qYWk" role="jymVt">
-        <property role="1EzhhJ" value="false" />
-        <property role="TrG5h" value="visitList" />
-        <node concept="3Tm1VV" id="3OPtF03qYWm" role="1B3o_S" />
-        <node concept="37vLTG" id="3OPtF03qYWo" role="3clF46">
-          <property role="TrG5h" value="list" />
-          <node concept="3uibUv" id="3OPtF03qYWp" role="1tU5fm">
-            <ref role="3uigEE" node="3OPtF03lco4" resolve="ListFunc" />
-          </node>
-        </node>
-        <node concept="3clFbS" id="3OPtF03qYWu" role="3clF47">
-          <node concept="3SKdUt" id="3OPtF03r4kP" role="3cqZAp">
-            <node concept="3SKdUq" id="3OPtF03r4vZ" role="3SKWNk">
-              <property role="3SKdUp" value="TODO check this out" />
-            </node>
-          </node>
-          <node concept="3clFbF" id="3OPtF03r3eb" role="3cqZAp">
-            <node concept="2OqwBi" id="3OPtF03r3w8" role="3clFbG">
-              <node concept="37vLTw" id="3OPtF03r3ea" role="2Oq$k0">
-                <ref role="3cqZAo" node="3OPtF03qYWo" resolve="list" />
-              </node>
-              <node concept="liA8E" id="3OPtF03r3Ol" role="2OqNvi">
-                <ref role="37wK5l" node="3OPtF03lct2" resolve="mapRecursively" />
-                <node concept="Xjq3P" id="5s497VqOYzX" role="37wK5m" />
-              </node>
-            </node>
-          </node>
-        </node>
-        <node concept="3uibUv" id="5s497VqrgfG" role="3clF45">
-          <ref role="3uigEE" node="1bm7a6EXvsP" resolve="Atom" />
-        </node>
-        <node concept="2AHcQZ" id="5s497Vqv_b$" role="2AJF6D">
-          <ref role="2AI5Lk" to="wyt6:~Override" resolve="Override" />
-        </node>
-      </node>
-      <node concept="2tJIrI" id="3OPtF03r08O" role="jymVt" />
-      <node concept="3clFb_" id="3OPtF02YFAs" role="jymVt">
-        <property role="1EzhhJ" value="false" />
-        <property role="TrG5h" value="visitValues" />
-        <node concept="37vLTG" id="3OPtF02YFAt" role="3clF46">
-          <property role="TrG5h" value="values" />
-          <node concept="3uibUv" id="3OPtF02YFAu" role="1tU5fm">
-            <ref role="3uigEE" node="1msb0mq99GH" resolve="ValueFunc" />
-            <node concept="16syzq" id="3OPtF02YFAv" role="11_B2D">
-              <ref role="16sUi3" node="3OPtF02YFAz" resolve="V" />
-            </node>
-          </node>
-        </node>
-        <node concept="3uibUv" id="3OPtF02ZRrt" role="3clF45">
-          <ref role="3uigEE" node="1bm7a6EXvsP" resolve="Atom" />
-        </node>
-        <node concept="3Tm1VV" id="3OPtF02YFAx" role="1B3o_S" />
-        <node concept="16euLQ" id="3OPtF02YFAz" role="16eVyc">
-          <property role="TrG5h" value="V" />
-        </node>
-        <node concept="3clFbS" id="3OPtF02YFA$" role="3clF47">
-          <node concept="3clFbF" id="3OPtF02ZPXU" role="3cqZAp">
-            <node concept="2OqwBi" id="3OPtF02ZQeO" role="3clFbG">
-              <node concept="37vLTw" id="3OPtF02ZPXT" role="2Oq$k0">
-                <ref role="3cqZAo" node="3OPtF02YFAt" resolve="values" />
-              </node>
-              <node concept="liA8E" id="3OPtF02ZQ$E" role="2OqNvi">
-                <ref role="37wK5l" node="1bm7a6EXT8b" resolve="copyRecursively" />
-              </node>
-            </node>
-          </node>
-        </node>
-        <node concept="2AHcQZ" id="5s497VqvAx1" role="2AJF6D">
-          <ref role="2AI5Lk" to="wyt6:~Override" resolve="Override" />
-        </node>
-      </node>
-      <node concept="2tJIrI" id="3OPtF031095" role="jymVt" />
-      <node concept="3clFb_" id="104EUzFJnf0" role="jymVt">
-        <property role="1EzhhJ" value="false" />
-        <property role="TrG5h" value="visitValue" />
-        <node concept="37vLTG" id="104EUzFJnf1" role="3clF46">
-          <property role="TrG5h" value="value" />
-          <node concept="3uibUv" id="104EUzFJnf2" role="1tU5fm">
-            <ref role="3uigEE" node="2xQ7eRAD2dj" resolve="Value" />
-            <node concept="16syzq" id="104EUzFJnf3" role="11_B2D">
-              <ref role="16sUi3" node="104EUzFJnf7" resolve="V" />
-            </node>
-          </node>
-        </node>
-        <node concept="3uibUv" id="104EUzFJnf4" role="3clF45">
-          <ref role="3uigEE" to="wyt6:~Object" resolve="Object" />
-        </node>
-        <node concept="3Tm1VV" id="104EUzFJnf5" role="1B3o_S" />
-        <node concept="16euLQ" id="104EUzFJnf7" role="16eVyc">
-          <property role="TrG5h" value="V" />
-        </node>
-        <node concept="3clFbS" id="104EUzFJnf8" role="3clF47">
-          <node concept="3SKdUt" id="104EUzGbuyO" role="3cqZAp">
-            <node concept="3SKdUq" id="104EUzGbuyW" role="3SKWNk">
-              <property role="3SKdUp" value="FIXME implement me" />
-            </node>
-          </node>
-          <node concept="YS8fn" id="104EUzFJqGk" role="3cqZAp">
-            <node concept="2ShNRf" id="104EUzFJqGU" role="YScLw">
-              <node concept="1pGfFk" id="104EUzFJqWo" role="2ShVmc">
-                <ref role="37wK5l" to="wyt6:~UnsupportedOperationException.&lt;init&gt;()" resolve="UnsupportedOperationException" />
-              </node>
-            </node>
-          </node>
-        </node>
-        <node concept="2AHcQZ" id="104EUzFJpDV" role="2AJF6D">
-          <ref role="2AI5Lk" to="wyt6:~Override" resolve="Override" />
-        </node>
-      </node>
-      <node concept="2tJIrI" id="104EUzFJoyy" role="jymVt" />
-      <node concept="3clFb_" id="3OPtF02YFA_" role="jymVt">
-        <property role="1EzhhJ" value="false" />
-        <property role="TrG5h" value="visitVariables" />
-        <node concept="37vLTG" id="3OPtF02YFAA" role="3clF46">
-          <property role="TrG5h" value="variables" />
-          <node concept="3uibUv" id="3OPtF02YFAB" role="1tU5fm">
-            <ref role="3uigEE" node="uNmovXiSQ6" resolve="VariableFunc" />
-          </node>
-        </node>
-        <node concept="3Tm1VV" id="3OPtF02YFAD" role="1B3o_S" />
-        <node concept="3clFbS" id="3OPtF02YFAF" role="3clF47">
-          <node concept="3clFbF" id="3OPtF02ZUbs" role="3cqZAp">
-            <node concept="2OqwBi" id="3OPtF02ZUmm" role="3clFbG">
-              <node concept="37vLTw" id="3OPtF02ZUbr" role="2Oq$k0">
-                <ref role="3cqZAo" node="3OPtF02YFAA" resolve="variables" />
-              </node>
-              <node concept="liA8E" id="3OPtF02ZUAF" role="2OqNvi">
-                <ref role="37wK5l" node="1bm7a6EXEaM" resolve="copyRecursively" />
-              </node>
-            </node>
-          </node>
-        </node>
-        <node concept="3uibUv" id="3OPtF02ZTUY" role="3clF45">
-          <ref role="3uigEE" node="1bm7a6EXvsP" resolve="Atom" />
-        </node>
-        <node concept="2AHcQZ" id="5s497VqvC2B" role="2AJF6D">
-          <ref role="2AI5Lk" to="wyt6:~Override" resolve="Override" />
-        </node>
-      </node>
-      <node concept="2tJIrI" id="5s497VqE8$3" role="jymVt" />
-      <node concept="3clFb_" id="104EUzFJs2F" role="jymVt">
-        <property role="1EzhhJ" value="false" />
-        <property role="TrG5h" value="visitVariable" />
-        <node concept="37vLTG" id="104EUzFJs2G" role="3clF46">
-          <property role="TrG5h" value="variable" />
-          <node concept="3uibUv" id="104EUzFJs2H" role="1tU5fm">
-            <ref role="3uigEE" node="uNmovXiEd4" resolve="Variable" />
-          </node>
-        </node>
-        <node concept="3uibUv" id="104EUzFJs2I" role="3clF45">
-          <ref role="3uigEE" to="wyt6:~Object" resolve="Object" />
-        </node>
-        <node concept="3Tm1VV" id="104EUzFJs2J" role="1B3o_S" />
-        <node concept="3clFbS" id="104EUzFJs2L" role="3clF47">
-          <node concept="3SKdUt" id="104EUzGbqpX" role="3cqZAp">
-            <node concept="3SKdUq" id="104EUzGbqqV" role="3SKWNk">
-              <property role="3SKdUp" value="FIXME implement me" />
-            </node>
-          </node>
-          <node concept="YS8fn" id="104EUzFJw_u" role="3cqZAp">
-            <node concept="2ShNRf" id="104EUzFJwA4" role="YScLw">
-              <node concept="1pGfFk" id="104EUzFJwOG" role="2ShVmc">
-                <ref role="37wK5l" to="wyt6:~UnsupportedOperationException.&lt;init&gt;()" resolve="UnsupportedOperationException" />
-              </node>
-            </node>
-          </node>
-        </node>
-        <node concept="2AHcQZ" id="104EUzFJvxT" role="2AJF6D">
-          <ref role="2AI5Lk" to="wyt6:~Override" resolve="Override" />
-        </node>
-      </node>
-      <node concept="2tJIrI" id="104EUzFJtqh" role="jymVt" />
-      <node concept="312cEg" id="3OPtF031_11" role="jymVt">
-        <property role="TrG5h" value="symbol" />
-        <node concept="3Tm6S6" id="3OPtF031_12" role="1B3o_S" />
-        <node concept="3uibUv" id="3OPtF031_14" role="1tU5fm">
-          <ref role="3uigEE" to="wyt6:~Object" resolve="Object" />
-        </node>
-      </node>
-      <node concept="312cEg" id="3OPtF031MyM" role="jymVt">
-        <property role="TrG5h" value="delegate" />
-        <node concept="3Tm6S6" id="3OPtF031MyN" role="1B3o_S" />
-        <node concept="3uibUv" id="3OPtF031MyP" role="1tU5fm">
-          <ref role="3uigEE" node="3OPtF031GQe" resolve="Mappers.MapperDelegate" />
-          <node concept="3uibUv" id="104EUzGgonO" role="11_B2D">
-            <ref role="3uigEE" node="1msb0mq9ID4" resolve="Func" />
-          </node>
-        </node>
-      </node>
-    </node>
-    <node concept="2tJIrI" id="3OPtF02Tc53" role="jymVt" />
-    <node concept="3Tm1VV" id="3OPtF02T8yy" role="1B3o_S" />
-  </node>
   <node concept="312cEu" id="3OPtF03lco4">
     <property role="TrG5h" value="ListFunc" />
     <node concept="2tJIrI" id="3OPtF03lcol" role="jymVt" />
@@ -8985,11 +8228,6 @@
                 </node>
               </node>
               <node concept="3clFbH" id="6SZa6nhOdO_" role="3cqZAp" />
-              <node concept="3SKdUt" id="6SZa6nhOb5k" role="3cqZAp">
-                <node concept="3SKdUq" id="6SZa6nhObsj" role="3SKWNk">
-                  <property role="3SKdUp" value="FIXME: hack, support &quot;list variables&quot; instead" />
-                </node>
-              </node>
               <node concept="3clFbJ" id="1OShD0IbW7W" role="3cqZAp">
                 <node concept="1Wc70l" id="2DKqMqOgYmO" role="3clFbw">
                   <node concept="2ZW3vV" id="1OShD0IbXxR" role="3uHU7B">
@@ -9000,16 +8238,14 @@
                       <ref role="3cqZAo" node="1OShD0IbQqE" resolve="last" />
                     </node>
                   </node>
-                  <node concept="2OqwBi" id="2DKqMqOgYV2" role="3uHU7w">
-                    <node concept="liA8E" id="2DKqMqOj2eT" role="2OqNvi">
-                      <ref role="37wK5l" node="2DKqMqOiVjz" resolve="isWildcard" />
-                    </node>
-                    <node concept="1eOMI4" id="2DKqMqOgYy8" role="2Oq$k0">
-                      <node concept="10QFUN" id="2DKqMqOgYy5" role="1eOMHV">
-                        <node concept="3uibUv" id="2DKqMqOj1DD" role="10QFUM">
+                  <node concept="1rXfSq" id="6HT7BWBR0Gd" role="3uHU7w">
+                    <ref role="37wK5l" node="6HT7BWBQYXM" resolve="isListVar" />
+                    <node concept="1eOMI4" id="6HT7BWBQIt2" role="37wK5m">
+                      <node concept="10QFUN" id="6HT7BWBQIsZ" role="1eOMHV">
+                        <node concept="3uibUv" id="6HT7BWBQIun" role="10QFUM">
                           <ref role="3uigEE" node="uNmovXiEd4" resolve="Variable" />
                         </node>
-                        <node concept="37vLTw" id="2DKqMqOgYMM" role="10QFUP">
+                        <node concept="37vLTw" id="6HT7BWBQIzm" role="10QFUP">
                           <ref role="3cqZAo" node="1OShD0IbQqE" resolve="last" />
                         </node>
                       </node>
@@ -9094,6 +8330,51 @@
         <ref role="3uigEE" node="3OPtF03lco4" resolve="ListFunc" />
       </node>
     </node>
+    <node concept="2tJIrI" id="6HT7BWBQJVg" role="jymVt" />
+    <node concept="2YIFZL" id="6HT7BWBQYXM" role="jymVt">
+      <property role="TrG5h" value="isListVar" />
+      <property role="IEkAT" value="false" />
+      <property role="DiZV1" value="false" />
+      <property role="od$2w" value="false" />
+      <node concept="3clFbS" id="6HT7BWBQO3L" role="3clF47">
+        <node concept="3SKdUt" id="6SZa6nhOb5k" role="3cqZAp">
+          <node concept="3SKdUq" id="6SZa6nhObsj" role="3SKWNk">
+            <property role="3SKdUp" value="FIXME: hack, support &quot;list variables&quot; instead" />
+          </node>
+        </node>
+        <node concept="3clFbF" id="6HT7BWBQWaJ" role="3cqZAp">
+          <node concept="22lmx$" id="6HT7BWBQWqO" role="3clFbG">
+            <node concept="2OqwBi" id="6HT7BWBQWxp" role="3uHU7w">
+              <node concept="37vLTw" id="6HT7BWBQWs0" role="2Oq$k0">
+                <ref role="3cqZAo" node="6HT7BWBQUvN" resolve="variable" />
+              </node>
+              <node concept="liA8E" id="6HT7BWBQWBM" role="2OqNvi">
+                <ref role="37wK5l" node="6Sag3Ksv6No" resolve="canRepresent" />
+                <node concept="3VsKOn" id="6HT7BWBQXfZ" role="37wK5m">
+                  <ref role="3VsUkX" node="3OPtF03lco4" resolve="ListFunc" />
+                </node>
+              </node>
+            </node>
+            <node concept="2OqwBi" id="6HT7BWBQWfN" role="3uHU7B">
+              <node concept="37vLTw" id="6HT7BWBQWaI" role="2Oq$k0">
+                <ref role="3cqZAo" node="6HT7BWBQUvN" resolve="variable" />
+              </node>
+              <node concept="liA8E" id="6HT7BWBQWlN" role="2OqNvi">
+                <ref role="37wK5l" node="2DKqMqOiVjz" resolve="isWildcard" />
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="37vLTG" id="6HT7BWBQUvN" role="3clF46">
+        <property role="TrG5h" value="variable" />
+        <node concept="3uibUv" id="6HT7BWBQVnv" role="1tU5fm">
+          <ref role="3uigEE" node="uNmovXiEd4" resolve="Variable" />
+        </node>
+      </node>
+      <node concept="10P_77" id="6HT7BWBQPL2" role="3clF45" />
+      <node concept="3Tm1VV" id="6HT7BWBQO3K" role="1B3o_S" />
+    </node>
     <node concept="2tJIrI" id="3OPtF03lcqd" role="jymVt" />
     <node concept="3clFbW" id="3OPtF03lcrB" role="jymVt">
       <node concept="3cqZAl" id="3OPtF03lcrC" role="3clF45" />
@@ -9838,6 +9119,45 @@
         </node>
       </node>
       <node concept="2tJIrI" id="3OPtF03lcxN" role="jymVt" />
+      <node concept="3clFb_" id="6HT7BWBQyCV" role="jymVt">
+        <property role="TrG5h" value="toList" />
+        <property role="1EzhhJ" value="false" />
+        <node concept="37vLTG" id="6HT7BWBQyCW" role="3clF46">
+          <property role="TrG5h" value="list" />
+          <node concept="3uibUv" id="6HT7BWBQyCX" role="1tU5fm">
+            <ref role="3uigEE" to="33ny:~List" resolve="List" />
+            <node concept="3uibUv" id="6HT7BWBQyCY" role="11_B2D">
+              <ref role="3uigEE" node="1bm7a6EXvsP" resolve="Atom" />
+            </node>
+          </node>
+        </node>
+        <node concept="3uibUv" id="6HT7BWBQyCZ" role="3clF45">
+          <ref role="3uigEE" to="33ny:~List" resolve="List" />
+          <node concept="3uibUv" id="6HT7BWBQyD0" role="11_B2D">
+            <ref role="3uigEE" node="1bm7a6EXvsP" resolve="Atom" />
+          </node>
+        </node>
+        <node concept="3Tm1VV" id="6HT7BWBQyD1" role="1B3o_S" />
+        <node concept="3clFbS" id="6HT7BWBQyDa" role="3clF47">
+          <node concept="3clFbF" id="6HT7BWBQ_uY" role="3cqZAp">
+            <node concept="1rXfSq" id="6HT7BWBQ_uX" role="3clFbG">
+              <ref role="37wK5l" node="3OPtF03lcxO" resolve="appendTo" />
+              <node concept="37vLTw" id="6HT7BWBQ_vS" role="37wK5m">
+                <ref role="3cqZAo" node="6HT7BWBQyCW" resolve="list" />
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbF" id="6HT7BWBQ_Cz" role="3cqZAp">
+            <node concept="37vLTw" id="6HT7BWBQ_Cx" role="3clFbG">
+              <ref role="3cqZAo" node="6HT7BWBQyCW" resolve="list" />
+            </node>
+          </node>
+        </node>
+        <node concept="2AHcQZ" id="6HT7BWBQyDb" role="2AJF6D">
+          <ref role="2AI5Lk" to="wyt6:~Override" resolve="Override" />
+        </node>
+      </node>
+      <node concept="2tJIrI" id="6HT7BWBQzKr" role="jymVt" />
       <node concept="3clFb_" id="3OPtF03lcxO" role="jymVt">
         <property role="TrG5h" value="appendTo" />
         <property role="1EzhhJ" value="false" />
@@ -10029,6 +9349,37 @@
         </node>
       </node>
       <node concept="2tJIrI" id="3OPtF03lczC" role="jymVt" />
+      <node concept="3clFb_" id="6HT7BWBQwJW" role="jymVt">
+        <property role="TrG5h" value="toList" />
+        <property role="1EzhhJ" value="false" />
+        <node concept="37vLTG" id="6HT7BWBQwJX" role="3clF46">
+          <property role="TrG5h" value="list" />
+          <node concept="3uibUv" id="6HT7BWBQwJY" role="1tU5fm">
+            <ref role="3uigEE" to="33ny:~List" resolve="List" />
+            <node concept="3uibUv" id="6HT7BWBQwJZ" role="11_B2D">
+              <ref role="3uigEE" node="1bm7a6EXvsP" resolve="Atom" />
+            </node>
+          </node>
+        </node>
+        <node concept="3uibUv" id="6HT7BWBQwK0" role="3clF45">
+          <ref role="3uigEE" to="33ny:~List" resolve="List" />
+          <node concept="3uibUv" id="6HT7BWBQwK1" role="11_B2D">
+            <ref role="3uigEE" node="1bm7a6EXvsP" resolve="Atom" />
+          </node>
+        </node>
+        <node concept="3Tm1VV" id="6HT7BWBQwK2" role="1B3o_S" />
+        <node concept="3clFbS" id="6HT7BWBQwKb" role="3clF47">
+          <node concept="3clFbF" id="6HT7BWBQyxy" role="3cqZAp">
+            <node concept="37vLTw" id="6HT7BWBQyxx" role="3clFbG">
+              <ref role="3cqZAo" node="6HT7BWBQwJX" resolve="list" />
+            </node>
+          </node>
+        </node>
+        <node concept="2AHcQZ" id="6HT7BWBQwKc" role="2AJF6D">
+          <ref role="2AI5Lk" to="wyt6:~Override" resolve="Override" />
+        </node>
+      </node>
+      <node concept="2tJIrI" id="6HT7BWBQxE_" role="jymVt" />
       <node concept="3clFb_" id="3OPtF03lczQ" role="jymVt">
         <property role="TrG5h" value="appendTo" />
         <property role="1EzhhJ" value="false" />
@@ -10146,42 +9497,96 @@
           <ref role="2AI5Lk" to="wyt6:~Override" resolve="Override" />
         </node>
         <node concept="3clFbS" id="1OShD0I2Znu" role="3clF47">
-          <node concept="3cpWs8" id="1OShD0I2Znv" role="3cqZAp">
-            <node concept="3cpWsn" id="1OShD0I2Znw" role="3cpWs9">
-              <property role="TrG5h" value="varMap" />
-              <node concept="10QFUN" id="1OShD0I2Znx" role="33vP2m">
-                <node concept="3uibUv" id="3H0z$hTunco" role="10QFUM">
-                  <ref role="3uigEE" node="uNmovXiEd4" resolve="Variable" />
+          <node concept="3cpWs8" id="6HT7BWBOytl" role="3cqZAp">
+            <node concept="3cpWsn" id="6HT7BWBOytm" role="3cpWs9">
+              <property role="TrG5h" value="atom" />
+              <node concept="3uibUv" id="6HT7BWBOytj" role="1tU5fm">
+                <ref role="3uigEE" node="1bm7a6EXvsP" resolve="Atom" />
+              </node>
+              <node concept="2OqwBi" id="6HT7BWBOytn" role="33vP2m">
+                <node concept="37vLTw" id="6HT7BWBOyto" role="2Oq$k0">
+                  <ref role="3cqZAo" node="1OShD0I2Znq" resolve="mapper" />
                 </node>
-                <node concept="2OqwBi" id="1OShD0I2Znz" role="10QFUP">
-                  <node concept="37vLTw" id="1OShD0I2Zn$" role="2Oq$k0">
-                    <ref role="3cqZAo" node="1OShD0I2Znq" resolve="mapper" />
+                <node concept="liA8E" id="6HT7BWBOytp" role="2OqNvi">
+                  <ref role="37wK5l" node="3OPtF02TgQt" resolve="map" />
+                  <node concept="1rXfSq" id="6HT7BWBOytq" role="37wK5m">
+                    <ref role="37wK5l" node="5j6rs$cKt1O" resolve="get" />
                   </node>
-                  <node concept="liA8E" id="1OShD0I2Zn_" role="2OqNvi">
-                    <ref role="37wK5l" node="3OPtF02TgQt" resolve="map" />
-                    <node concept="1rXfSq" id="1OShD0I2ZnA" role="37wK5m">
-                      <ref role="37wK5l" node="5j6rs$cKt1O" resolve="get" />
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbJ" id="6HT7BWBOz47" role="3cqZAp">
+            <node concept="3clFbS" id="6HT7BWBOz49" role="3clFbx">
+              <node concept="3cpWs6" id="6HT7BWBOznG" role="3cqZAp">
+                <node concept="2YIFZM" id="1OShD0I7__u" role="3cqZAk">
+                  <ref role="37wK5l" node="1OShD0I3vRu" resolve="createAlias" />
+                  <ref role="1Pybhc" node="3OPtF03lco4" resolve="ListFunc" />
+                  <node concept="10QFUN" id="6HT7BWBOIM8" role="37wK5m">
+                    <node concept="3uibUv" id="6HT7BWBOIM6" role="10QFUM">
+                      <ref role="3uigEE" node="uNmovXiEd4" resolve="Variable" />
+                    </node>
+                    <node concept="37vLTw" id="6HT7BWBOIM7" role="10QFUP">
+                      <ref role="3cqZAo" node="6HT7BWBOytm" resolve="atom" />
                     </node>
                   </node>
                 </node>
               </node>
-              <node concept="3uibUv" id="3H0z$hTunak" role="1tU5fm">
+              <node concept="3clFbH" id="6HT7BWBOBqV" role="3cqZAp" />
+            </node>
+            <node concept="2ZW3vV" id="6HT7BWBOze8" role="3clFbw">
+              <node concept="3uibUv" id="6HT7BWBOzk1" role="2ZW6by">
                 <ref role="3uigEE" node="uNmovXiEd4" resolve="Variable" />
               </node>
+              <node concept="37vLTw" id="6HT7BWBOz67" role="2ZW6bz">
+                <ref role="3cqZAo" node="6HT7BWBOytm" resolve="atom" />
+              </node>
             </node>
-          </node>
-          <node concept="3clFbF" id="1OShD0I2Znk" role="3cqZAp">
-            <node concept="2YIFZM" id="1OShD0I7__u" role="3clFbG">
-              <ref role="37wK5l" node="1OShD0I3vRu" resolve="createAlias" />
-              <ref role="1Pybhc" node="3OPtF03lco4" resolve="ListFunc" />
-              <node concept="37vLTw" id="1OShD0I80LN" role="37wK5m">
-                <ref role="3cqZAo" node="1OShD0I2Znw" resolve="varMap" />
+            <node concept="3eNFk2" id="6HT7BWBOAfD" role="3eNLev">
+              <node concept="3clFbS" id="6HT7BWBOAfE" role="3eOfB_">
+                <node concept="3cpWs6" id="6HT7BWBOC5z" role="3cqZAp">
+                  <node concept="2YIFZM" id="6HT7BWBOGwz" role="3cqZAk">
+                    <ref role="37wK5l" node="1OShD0HS45f" resolve="createList" />
+                    <ref role="1Pybhc" node="3OPtF03lco4" resolve="ListFunc" />
+                    <node concept="37vLTw" id="6HT7BWBOGw$" role="37wK5m">
+                      <ref role="3cqZAo" node="6HT7BWBOytm" resolve="atom" />
+                    </node>
+                  </node>
+                </node>
+                <node concept="3clFbH" id="6HT7BWBOKMz" role="3cqZAp" />
+              </node>
+              <node concept="2ZW3vV" id="6HT7BWBOAYX" role="3eO9$A">
+                <node concept="3uibUv" id="6HT7BWBOExh" role="2ZW6by">
+                  <ref role="3uigEE" node="3OPtF03lco4" resolve="ListFunc" />
+                </node>
+                <node concept="37vLTw" id="6HT7BWBOARN" role="2ZW6bz">
+                  <ref role="3cqZAo" node="6HT7BWBOytm" resolve="atom" />
+                </node>
+              </node>
+            </node>
+            <node concept="9aQIb" id="6HT7BWBOKa9" role="9aQIa">
+              <node concept="3clFbS" id="6HT7BWBOKaa" role="9aQI4">
+                <node concept="YS8fn" id="6HT7BWBOM4i" role="3cqZAp">
+                  <node concept="2ShNRf" id="6HT7BWBOM4W" role="YScLw">
+                    <node concept="1pGfFk" id="6HT7BWBONeM" role="2ShVmc">
+                      <ref role="37wK5l" to="wyt6:~IllegalStateException.&lt;init&gt;(java.lang.String)" resolve="IllegalStateException" />
+                      <node concept="3cpWs3" id="6HT7BWBONr_" role="37wK5m">
+                        <node concept="37vLTw" id="6HT7BWBONt3" role="3uHU7w">
+                          <ref role="3cqZAo" node="6HT7BWBOytm" resolve="atom" />
+                        </node>
+                        <node concept="Xl_RD" id="6HT7BWBONfA" role="3uHU7B">
+                          <property role="Xl_RC" value="unexpected map result: " />
+                        </node>
+                      </node>
+                    </node>
+                  </node>
+                </node>
               </node>
             </node>
           </node>
         </node>
-        <node concept="3uibUv" id="1OShD0I7M7Z" role="3clF45">
-          <ref role="3uigEE" node="1OShD0I20qU" resolve="ListFunc.Alias" />
+        <node concept="3uibUv" id="6HT7BWBOHkC" role="3clF45">
+          <ref role="3uigEE" node="3OPtF03lco4" resolve="ListFunc" />
         </node>
       </node>
       <node concept="2tJIrI" id="1OShD0I2ZnQ" role="jymVt" />
@@ -10275,6 +9680,45 @@
         </node>
       </node>
       <node concept="2tJIrI" id="1OShD0I2Zo6" role="jymVt" />
+      <node concept="3clFb_" id="6HT7BWBQu7y" role="jymVt">
+        <property role="TrG5h" value="toList" />
+        <property role="1EzhhJ" value="false" />
+        <node concept="37vLTG" id="6HT7BWBQu7z" role="3clF46">
+          <property role="TrG5h" value="list" />
+          <node concept="3uibUv" id="6HT7BWBQu7$" role="1tU5fm">
+            <ref role="3uigEE" to="33ny:~List" resolve="List" />
+            <node concept="3uibUv" id="6HT7BWBQu7_" role="11_B2D">
+              <ref role="3uigEE" node="1bm7a6EXvsP" resolve="Atom" />
+            </node>
+          </node>
+        </node>
+        <node concept="3uibUv" id="6HT7BWBQu7A" role="3clF45">
+          <ref role="3uigEE" to="33ny:~List" resolve="List" />
+          <node concept="3uibUv" id="6HT7BWBQu7B" role="11_B2D">
+            <ref role="3uigEE" node="1bm7a6EXvsP" resolve="Atom" />
+          </node>
+        </node>
+        <node concept="3Tm1VV" id="6HT7BWBQu7C" role="1B3o_S" />
+        <node concept="3clFbS" id="6HT7BWBQu7L" role="3clF47">
+          <node concept="3clFbF" id="6HT7BWBQwkg" role="3cqZAp">
+            <node concept="1rXfSq" id="6HT7BWBQwkf" role="3clFbG">
+              <ref role="37wK5l" node="1OShD0I2Zo7" resolve="appendTo" />
+              <node concept="37vLTw" id="6HT7BWBQwsJ" role="37wK5m">
+                <ref role="3cqZAo" node="6HT7BWBQu7z" resolve="list" />
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbF" id="6HT7BWBQwAR" role="3cqZAp">
+            <node concept="37vLTw" id="6HT7BWBQwAP" role="3clFbG">
+              <ref role="3cqZAo" node="6HT7BWBQu7z" resolve="list" />
+            </node>
+          </node>
+        </node>
+        <node concept="2AHcQZ" id="6HT7BWBQu7M" role="2AJF6D">
+          <ref role="2AI5Lk" to="wyt6:~Override" resolve="Override" />
+        </node>
+      </node>
+      <node concept="2tJIrI" id="6HT7BWBQveI" role="jymVt" />
       <node concept="3clFb_" id="1OShD0I2Zo7" role="jymVt">
         <property role="TrG5h" value="appendTo" />
         <property role="1EzhhJ" value="false" />
@@ -10530,101 +9974,133 @@
         </node>
       </node>
       <node concept="3clFbS" id="3gJBs5s$T2j" role="3clF47">
-        <node concept="3SKdUt" id="3gJBs5s$T2k" role="3cqZAp">
-          <node concept="3SKdUq" id="3gJBs5s$T2l" role="3SKWNk">
-            <property role="3SKdUp" value="FIXME hack to support printing variables" />
-          </node>
-        </node>
-        <node concept="3clFbJ" id="3gJBs5s$T2m" role="3cqZAp">
-          <node concept="3clFbS" id="3gJBs5s$T2n" role="3clFbx">
-            <node concept="3clFbF" id="3gJBs5s$T2o" role="3cqZAp">
-              <node concept="2OqwBi" id="3gJBs5s$T2p" role="3clFbG">
-                <node concept="Rm8GO" id="3gJBs5s$T2q" role="2Oq$k0">
-                  <ref role="Rm8GQ" node="5s497Vr0Gpo" resolve="EOL" />
-                  <ref role="1Px2BO" node="5s497Vr0zK6" resolve="PrettyPrinter.Separator" />
-                </node>
-                <node concept="liA8E" id="3gJBs5s$T2r" role="2OqNvi">
-                  <ref role="37wK5l" node="5s497Vr0_pl" resolve="appendTo" />
-                  <node concept="37vLTw" id="3gJBs5s$T4d" role="37wK5m">
-                    <ref role="3cqZAo" node="3gJBs5s$T2W" resolve="printer" />
-                  </node>
-                </node>
+        <node concept="SfApY" id="6HT7BWBQ4HA" role="3cqZAp">
+          <node concept="3clFbS" id="6HT7BWBQ4HC" role="SfCbr">
+            <node concept="3SKdUt" id="3gJBs5s$T2k" role="3cqZAp">
+              <node concept="3SKdUq" id="3gJBs5s$T2l" role="3SKWNk">
+                <property role="3SKdUp" value="FIXME hack to support printing variables" />
               </node>
             </node>
-            <node concept="3clFbF" id="3gJBs5s$T2t" role="3cqZAp">
-              <node concept="2OqwBi" id="3gJBs5s$T2u" role="3clFbG">
-                <node concept="Rm8GO" id="3gJBs5s$T2v" role="2Oq$k0">
-                  <ref role="Rm8GQ" node="5s497Vr0AJd" resolve="INDENT" />
-                  <ref role="1Px2BO" node="5s497Vr0zK6" resolve="PrettyPrinter.Separator" />
-                </node>
-                <node concept="liA8E" id="3gJBs5s$T2w" role="2OqNvi">
-                  <ref role="37wK5l" node="5s497Vr0_pl" resolve="appendTo" />
-                  <node concept="37vLTw" id="3gJBs5s$T4c" role="37wK5m">
-                    <ref role="3cqZAo" node="3gJBs5s$T2W" resolve="printer" />
-                  </node>
-                </node>
-              </node>
-            </node>
-            <node concept="3clFbF" id="3gJBs5s$T2y" role="3cqZAp">
-              <node concept="2OqwBi" id="3gJBs5s$T2z" role="3clFbG">
-                <node concept="37vLTw" id="3gJBs5s$T4g" role="2Oq$k0">
-                  <ref role="3cqZAo" node="3gJBs5s$T2W" resolve="printer" />
-                </node>
-                <node concept="liA8E" id="3gJBs5s$T2_" role="2OqNvi">
-                  <ref role="37wK5l" node="5s497VqYrbO" resolve="append" />
-                  <node concept="2YIFZM" id="3gJBs5s$T2A" role="37wK5m">
-                    <ref role="37wK5l" to="wyt6:~String.valueOf(java.lang.Object):java.lang.String" resolve="valueOf" />
-                    <ref role="1Pybhc" to="wyt6:~String" resolve="String" />
-                    <node concept="37vLTw" id="3gJBs5s$T4h" role="37wK5m">
-                      <ref role="3cqZAo" node="3gJBs5s$T2T" resolve="tbr" />
+            <node concept="3clFbJ" id="3gJBs5s$T2m" role="3cqZAp">
+              <node concept="3clFbS" id="3gJBs5s$T2n" role="3clFbx">
+                <node concept="3clFbF" id="3gJBs5s$T2o" role="3cqZAp">
+                  <node concept="2OqwBi" id="3gJBs5s$T2p" role="3clFbG">
+                    <node concept="Rm8GO" id="3gJBs5s$T2q" role="2Oq$k0">
+                      <ref role="Rm8GQ" node="5s497Vr0Gpo" resolve="EOL" />
+                      <ref role="1Px2BO" node="5s497Vr0zK6" resolve="PrettyPrinter.Separator" />
                     </node>
-                  </node>
-                </node>
-              </node>
-            </node>
-          </node>
-          <node concept="2OqwBi" id="3gJBs5s$T2C" role="3clFbw">
-            <node concept="37vLTw" id="3gJBs5s$T4e" role="2Oq$k0">
-              <ref role="3cqZAo" node="3gJBs5s$T2T" resolve="tbr" />
-            </node>
-            <node concept="liA8E" id="3gJBs5s$T2E" role="2OqNvi">
-              <ref role="37wK5l" to="yt73:~Term.is(Kind)" resolve="is" />
-              <node concept="Rm8GO" id="573vQv1nxni" role="37wK5m">
-                <ref role="Rm8GQ" to="yt73:~Term.VAR" resolve="VAR" />
-                <ref role="1Px2BO" to="yt73:~Term.Kind" resolve="Term.Kind" />
-              </node>
-            </node>
-          </node>
-          <node concept="9aQIb" id="3gJBs5s$T2G" role="9aQIa">
-            <node concept="3clFbS" id="3gJBs5s$T2H" role="9aQI4">
-              <node concept="3clFbF" id="3gJBs5s$T2I" role="3cqZAp">
-                <node concept="2OqwBi" id="3gJBs5s$T2J" role="3clFbG">
-                  <node concept="2ShNRf" id="3gJBs5s$T2K" role="2Oq$k0">
-                    <node concept="1pGfFk" id="3gJBs5s$T2L" role="2ShVmc">
-                      <ref role="37wK5l" node="47nvOnTQN6Q" resolve="AtomWalk" />
-                      <node concept="37vLTw" id="3gJBs5s$T4b" role="37wK5m">
+                    <node concept="liA8E" id="3gJBs5s$T2r" role="2OqNvi">
+                      <ref role="37wK5l" node="5s497Vr0_pl" resolve="appendTo" />
+                      <node concept="37vLTw" id="3gJBs5s$T4d" role="37wK5m">
                         <ref role="3cqZAo" node="3gJBs5s$T2W" resolve="printer" />
                       </node>
                     </node>
                   </node>
-                  <node concept="liA8E" id="3gJBs5s$T2N" role="2OqNvi">
-                    <ref role="37wK5l" node="1hOy_Afq63K" resolve="walk" />
-                    <node concept="37vLTw" id="3gJBs5s$T4a" role="37wK5m">
-                      <ref role="3cqZAo" node="3gJBs5s$T2T" resolve="tbr" />
+                </node>
+                <node concept="3clFbF" id="3gJBs5s$T2t" role="3cqZAp">
+                  <node concept="2OqwBi" id="3gJBs5s$T2u" role="3clFbG">
+                    <node concept="Rm8GO" id="3gJBs5s$T2v" role="2Oq$k0">
+                      <ref role="Rm8GQ" node="5s497Vr0AJd" resolve="INDENT" />
+                      <ref role="1Px2BO" node="5s497Vr0zK6" resolve="PrettyPrinter.Separator" />
+                    </node>
+                    <node concept="liA8E" id="3gJBs5s$T2w" role="2OqNvi">
+                      <ref role="37wK5l" node="5s497Vr0_pl" resolve="appendTo" />
+                      <node concept="37vLTw" id="3gJBs5s$T4c" role="37wK5m">
+                        <ref role="3cqZAo" node="3gJBs5s$T2W" resolve="printer" />
+                      </node>
+                    </node>
+                  </node>
+                </node>
+                <node concept="3clFbF" id="3gJBs5s$T2y" role="3cqZAp">
+                  <node concept="2OqwBi" id="3gJBs5s$T2z" role="3clFbG">
+                    <node concept="37vLTw" id="3gJBs5s$T4g" role="2Oq$k0">
+                      <ref role="3cqZAo" node="3gJBs5s$T2W" resolve="printer" />
+                    </node>
+                    <node concept="liA8E" id="3gJBs5s$T2_" role="2OqNvi">
+                      <ref role="37wK5l" node="5s497VqYrbO" resolve="append" />
+                      <node concept="2YIFZM" id="3gJBs5s$T2A" role="37wK5m">
+                        <ref role="37wK5l" to="wyt6:~String.valueOf(java.lang.Object):java.lang.String" resolve="valueOf" />
+                        <ref role="1Pybhc" to="wyt6:~String" resolve="String" />
+                        <node concept="37vLTw" id="3gJBs5s$T4h" role="37wK5m">
+                          <ref role="3cqZAo" node="3gJBs5s$T2T" resolve="tbr" />
+                        </node>
+                      </node>
+                    </node>
+                  </node>
+                </node>
+              </node>
+              <node concept="2OqwBi" id="3gJBs5s$T2C" role="3clFbw">
+                <node concept="37vLTw" id="3gJBs5s$T4e" role="2Oq$k0">
+                  <ref role="3cqZAo" node="3gJBs5s$T2T" resolve="tbr" />
+                </node>
+                <node concept="liA8E" id="3gJBs5s$T2E" role="2OqNvi">
+                  <ref role="37wK5l" to="yt73:~Term.is(Kind)" resolve="is" />
+                  <node concept="Rm8GO" id="573vQv1nxni" role="37wK5m">
+                    <ref role="Rm8GQ" to="yt73:~Term.VAR" resolve="VAR" />
+                    <ref role="1Px2BO" to="yt73:~Term.Kind" resolve="Term.Kind" />
+                  </node>
+                </node>
+              </node>
+              <node concept="9aQIb" id="3gJBs5s$T2G" role="9aQIa">
+                <node concept="3clFbS" id="3gJBs5s$T2H" role="9aQI4">
+                  <node concept="3clFbF" id="3gJBs5s$T2I" role="3cqZAp">
+                    <node concept="2OqwBi" id="3gJBs5s$T2J" role="3clFbG">
+                      <node concept="2ShNRf" id="3gJBs5s$T2K" role="2Oq$k0">
+                        <node concept="1pGfFk" id="3gJBs5s$T2L" role="2ShVmc">
+                          <ref role="37wK5l" node="47nvOnTQN6Q" resolve="AtomWalk" />
+                          <node concept="37vLTw" id="3gJBs5s$T4b" role="37wK5m">
+                            <ref role="3cqZAo" node="3gJBs5s$T2W" resolve="printer" />
+                          </node>
+                        </node>
+                      </node>
+                      <node concept="liA8E" id="3gJBs5s$T2N" role="2OqNvi">
+                        <ref role="37wK5l" node="1hOy_Afq63K" resolve="walk" />
+                        <node concept="37vLTw" id="3gJBs5s$T4a" role="37wK5m">
+                          <ref role="3cqZAo" node="3gJBs5s$T2T" resolve="tbr" />
+                        </node>
+                      </node>
                     </node>
                   </node>
                 </node>
               </node>
             </node>
-          </node>
-        </node>
-        <node concept="3clFbF" id="3gJBs5s$T2P" role="3cqZAp">
-          <node concept="2OqwBi" id="3gJBs5s$T2Q" role="3clFbG">
-            <node concept="37vLTw" id="3gJBs5s$T4f" role="2Oq$k0">
-              <ref role="3cqZAo" node="3gJBs5s$T2W" resolve="printer" />
+            <node concept="3cpWs6" id="6HT7BWBQ5Vu" role="3cqZAp">
+              <node concept="2OqwBi" id="6HT7BWBQ5Vv" role="3cqZAk">
+                <node concept="37vLTw" id="6HT7BWBQ5Vw" role="2Oq$k0">
+                  <ref role="3cqZAo" node="3gJBs5s$T2W" resolve="printer" />
+                </node>
+                <node concept="liA8E" id="6HT7BWBQ5Vx" role="2OqNvi">
+                  <ref role="37wK5l" node="5s497VqXNEj" resolve="toString" />
+                </node>
+              </node>
             </node>
-            <node concept="liA8E" id="3gJBs5s$T2S" role="2OqNvi">
-              <ref role="37wK5l" node="5s497VqXNEj" resolve="toString" />
+            <node concept="3clFbH" id="6HT7BWBQ4HB" role="3cqZAp" />
+          </node>
+          <node concept="TDmWw" id="6HT7BWBQ4HD" role="TEbGg">
+            <node concept="3cpWsn" id="6HT7BWBQ4HF" role="TDEfY">
+              <property role="TrG5h" value="ex" />
+              <node concept="3uibUv" id="6HT7BWBQ4M3" role="1tU5fm">
+                <ref role="3uigEE" to="wyt6:~RuntimeException" resolve="RuntimeException" />
+              </node>
+            </node>
+            <node concept="3clFbS" id="6HT7BWBQ4HJ" role="TDEfX">
+              <node concept="3cpWs6" id="6HT7BWBQ6oJ" role="3cqZAp">
+                <node concept="2YIFZM" id="6HT7BWBQ78j" role="3cqZAk">
+                  <ref role="1Pybhc" to="wyt6:~String" resolve="String" />
+                  <ref role="37wK5l" to="wyt6:~String.format(java.lang.String,java.lang.Object...):java.lang.String" resolve="format" />
+                  <node concept="Xl_RD" id="6HT7BWBQ7iS" role="37wK5m">
+                    <property role="Xl_RC" value="*** Exception during print [%s] ***" />
+                  </node>
+                  <node concept="2OqwBi" id="6HT7BWBQaHt" role="37wK5m">
+                    <node concept="37vLTw" id="6HT7BWBQaBL" role="2Oq$k0">
+                      <ref role="3cqZAo" node="6HT7BWBQ4HF" resolve="ex" />
+                    </node>
+                    <node concept="liA8E" id="6HT7BWBQaSB" role="2OqNvi">
+                      <ref role="37wK5l" to="wyt6:~Throwable.getMessage():java.lang.String" resolve="getMessage" />
+                    </node>
+                  </node>
+                </node>
+              </node>
             </node>
           </node>
         </node>
@@ -12037,1095 +11513,6 @@
       </node>
     </node>
   </node>
-  <node concept="312cEu" id="HdxW7q$dvC">
-    <property role="TrG5h" value="AtomMatcher" />
-    <node concept="2tJIrI" id="HdxW7q$dvD" role="jymVt" />
-    <node concept="3clFbW" id="HdxW7q$dvE" role="jymVt">
-      <node concept="37vLTG" id="HdxW7q$dvF" role="3clF46">
-        <property role="TrG5h" value="pattern" />
-        <node concept="3uibUv" id="HdxW7q$dvG" role="1tU5fm">
-          <ref role="3uigEE" node="1bm7a6EXvsP" resolve="Atom" />
-        </node>
-      </node>
-      <node concept="37vLTG" id="HdxW7q$dvI" role="3clF46">
-        <property role="TrG5h" value="replace" />
-        <node concept="3uibUv" id="HdxW7q$dvJ" role="1tU5fm">
-          <ref role="3uigEE" node="1bm7a6EXvsP" resolve="Atom" />
-        </node>
-      </node>
-      <node concept="3cqZAl" id="HdxW7q$dvL" role="3clF45" />
-      <node concept="3Tm1VV" id="HdxW7q$dvM" role="1B3o_S" />
-      <node concept="3clFbS" id="HdxW7q$dvN" role="3clF47">
-        <node concept="3clFbF" id="HdxW7q$dvO" role="3cqZAp">
-          <node concept="37vLTI" id="HdxW7q$dvP" role="3clFbG">
-            <node concept="2OqwBi" id="HdxW7q$dvQ" role="37vLTJ">
-              <node concept="Xjq3P" id="HdxW7q$dvR" role="2Oq$k0" />
-              <node concept="2OwXpG" id="HdxW7q$dvS" role="2OqNvi">
-                <ref role="2Oxat5" node="HdxW7q$dyd" resolve="pattern" />
-              </node>
-            </node>
-            <node concept="37vLTw" id="HdxW7q$dvT" role="37vLTx">
-              <ref role="3cqZAo" node="HdxW7q$dvF" resolve="pattern" />
-            </node>
-          </node>
-        </node>
-        <node concept="3clFbF" id="HdxW7q$dvU" role="3cqZAp">
-          <node concept="37vLTI" id="HdxW7q$dvV" role="3clFbG">
-            <node concept="2OqwBi" id="HdxW7q$dvW" role="37vLTJ">
-              <node concept="Xjq3P" id="HdxW7q$dvX" role="2Oq$k0" />
-              <node concept="2OwXpG" id="HdxW7q$dvY" role="2OqNvi">
-                <ref role="2Oxat5" node="HdxW7q$dyh" resolve="replace" />
-              </node>
-            </node>
-            <node concept="37vLTw" id="HdxW7q$dvZ" role="37vLTx">
-              <ref role="3cqZAo" node="HdxW7q$dvI" resolve="replace" />
-            </node>
-          </node>
-        </node>
-      </node>
-    </node>
-    <node concept="2tJIrI" id="HdxW7q$dw0" role="jymVt" />
-    <node concept="3clFb_" id="HdxW7q$dwq" role="jymVt">
-      <property role="TrG5h" value="matches" />
-      <node concept="37vLTG" id="HdxW7q$dwr" role="3clF46">
-        <property role="TrG5h" value="source" />
-        <node concept="3uibUv" id="HdxW7q$dws" role="1tU5fm">
-          <ref role="3uigEE" node="1bm7a6EXvsP" resolve="Atom" />
-        </node>
-      </node>
-      <node concept="10P_77" id="HdxW7q$dwu" role="3clF45" />
-      <node concept="3Tm1VV" id="HdxW7q$dwv" role="1B3o_S" />
-      <node concept="3clFbS" id="HdxW7q$dww" role="3clF47">
-        <node concept="3cpWs8" id="5PpdwMfDjde" role="3cqZAp">
-          <node concept="3cpWsn" id="5PpdwMfDjdf" role="3cpWs9">
-            <property role="TrG5h" value="sub" />
-            <node concept="3uibUv" id="5PpdwMfDjd5" role="1tU5fm">
-              <ref role="3uigEE" to="yt73:~Substitution" resolve="Substitution" />
-            </node>
-            <node concept="2YIFZM" id="5PpdwMfDjdg" role="33vP2m">
-              <ref role="1Pybhc" to="yt73:~Unification" resolve="Unification" />
-              <ref role="37wK5l" to="yt73:~Unification.unify(Term,Term)" resolve="unify" />
-              <node concept="37vLTw" id="5PpdwMfDjdh" role="37wK5m">
-                <ref role="3cqZAo" node="HdxW7q$dyd" resolve="pattern" />
-              </node>
-              <node concept="37vLTw" id="5PpdwMfDjdi" role="37wK5m">
-                <ref role="3cqZAo" node="HdxW7q$dwr" resolve="source" />
-              </node>
-            </node>
-          </node>
-        </node>
-        <node concept="3clFbJ" id="5PpdwMfDjIS" role="3cqZAp">
-          <node concept="3clFbS" id="5PpdwMfDjIV" role="3clFbx">
-            <node concept="3cpWs6" id="5PpdwMfDjQY" role="3cqZAp">
-              <node concept="3clFbT" id="5PpdwMfDjSc" role="3cqZAk">
-                <property role="3clFbU" value="false" />
-              </node>
-            </node>
-          </node>
-          <node concept="3fqX7Q" id="5PpdwMfDjOs" role="3clFbw">
-            <node concept="2OqwBi" id="HdxW7q$dwy" role="3fr31v">
-              <node concept="37vLTw" id="5PpdwMfDjdj" role="2Oq$k0">
-                <ref role="3cqZAo" node="5PpdwMfDjdf" resolve="sub" />
-              </node>
-              <node concept="liA8E" id="HdxW7q$dwA" role="2OqNvi">
-                <ref role="37wK5l" to="yt73:~Substitution.isSuccessful()" resolve="isSuccessful" />
-              </node>
-            </node>
-          </node>
-        </node>
-        <node concept="3clFbH" id="5PpdwMfDkpV" role="3cqZAp" />
-        <node concept="3SKdUt" id="5PpdwMfDti7" role="3cqZAp">
-          <node concept="3SKdUq" id="5PpdwMfDu70" role="3SKWNk">
-            <property role="3SKdUp" value="TODO: need a better way to check for the &quot;capturing&quot; variables" />
-          </node>
-        </node>
-        <node concept="1DcWWT" id="5PpdwMfDlUD" role="3cqZAp">
-          <node concept="3clFbS" id="5PpdwMfDlUE" role="2LFqv$">
-            <node concept="3clFbJ" id="5PpdwMfDmB7" role="3cqZAp">
-              <node concept="3clFbS" id="5PpdwMfDmB8" role="3clFbx">
-                <node concept="3cpWs6" id="5PpdwMfDnWU" role="3cqZAp">
-                  <node concept="3clFbT" id="5PpdwMfDnXm" role="3cqZAk">
-                    <property role="3clFbU" value="false" />
-                  </node>
-                </node>
-              </node>
-              <node concept="3fqX7Q" id="5PpdwMfDmCq" role="3clFbw">
-                <node concept="2ZW3vV" id="5PpdwMfDnph" role="3fr31v">
-                  <node concept="3uibUv" id="5PpdwMfDnD4" role="2ZW6by">
-                    <ref role="3uigEE" node="uNmovXiEd4" resolve="Variable" />
-                  </node>
-                  <node concept="2OqwBi" id="5PpdwMfDmEC" role="2ZW6bz">
-                    <node concept="37vLTw" id="5PpdwMfDmD1" role="2Oq$k0">
-                      <ref role="3cqZAo" node="5PpdwMfDlUH" resolve="bnd" />
-                    </node>
-                    <node concept="liA8E" id="5PpdwMfDmJ7" role="2OqNvi">
-                      <ref role="37wK5l" to="yt73:~Substitution.Binding.var()" resolve="var" />
-                    </node>
-                  </node>
-                </node>
-              </node>
-            </node>
-          </node>
-          <node concept="3cpWsn" id="5PpdwMfDlUH" role="1Duv9x">
-            <property role="TrG5h" value="bnd" />
-            <node concept="3uibUv" id="5PpdwMfDlUL" role="1tU5fm">
-              <ref role="3uigEE" to="yt73:~Substitution.Binding" resolve="Substitution.Binding" />
-            </node>
-          </node>
-          <node concept="2OqwBi" id="5PpdwMfDlUM" role="1DdaDG">
-            <node concept="37vLTw" id="5PpdwMfDlUN" role="2Oq$k0">
-              <ref role="3cqZAo" node="5PpdwMfDjdf" resolve="sub" />
-            </node>
-            <node concept="liA8E" id="5PpdwMfDlUO" role="2OqNvi">
-              <ref role="37wK5l" to="yt73:~Substitution.bindings()" resolve="bindings" />
-            </node>
-          </node>
-        </node>
-        <node concept="3clFbH" id="5PpdwMfDrD7" role="3cqZAp" />
-        <node concept="3clFbF" id="5PpdwMfDpAi" role="3cqZAp">
-          <node concept="3clFbT" id="5PpdwMfDpAh" role="3clFbG">
-            <property role="3clFbU" value="true" />
-          </node>
-        </node>
-      </node>
-    </node>
-    <node concept="2tJIrI" id="HdxW7q$dwB" role="jymVt" />
-    <node concept="3clFb_" id="HdxW7q$dwC" role="jymVt">
-      <property role="TrG5h" value="replace" />
-      <node concept="37vLTG" id="HdxW7q$dwD" role="3clF46">
-        <property role="TrG5h" value="source" />
-        <node concept="3uibUv" id="HdxW7q$dwE" role="1tU5fm">
-          <ref role="3uigEE" node="1bm7a6EXvsP" resolve="Atom" />
-        </node>
-      </node>
-      <node concept="3uibUv" id="HdxW7q$dwG" role="3clF45">
-        <ref role="3uigEE" node="1bm7a6EXvsP" resolve="Atom" />
-      </node>
-      <node concept="3Tm1VV" id="HdxW7q$dwI" role="1B3o_S" />
-      <node concept="3clFbS" id="HdxW7q$dwJ" role="3clF47">
-        <node concept="3cpWs8" id="HdxW7q$dwK" role="3cqZAp">
-          <node concept="3cpWsn" id="HdxW7q$dwL" role="3cpWs9">
-            <property role="TrG5h" value="subs" />
-            <property role="3TUv4t" value="true" />
-            <node concept="3uibUv" id="HdxW7q$dwM" role="1tU5fm">
-              <ref role="3uigEE" to="yt73:~Substitution" resolve="Substitution" />
-            </node>
-            <node concept="2YIFZM" id="HdxW7q$dwN" role="33vP2m">
-              <ref role="1Pybhc" to="yt73:~Unification" resolve="Unification" />
-              <ref role="37wK5l" to="yt73:~Unification.unify(Term,Term)" resolve="unify" />
-              <node concept="37vLTw" id="HdxW7q$dwO" role="37wK5m">
-                <ref role="3cqZAo" node="HdxW7q$dyd" resolve="pattern" />
-              </node>
-              <node concept="37vLTw" id="HdxW7q$dwP" role="37wK5m">
-                <ref role="3cqZAo" node="HdxW7q$dwD" resolve="source" />
-              </node>
-            </node>
-          </node>
-        </node>
-        <node concept="3clFbJ" id="HdxW7q$dwQ" role="3cqZAp">
-          <node concept="3clFbS" id="HdxW7q$dwR" role="3clFbx">
-            <node concept="3cpWs6" id="HdxW7q$dwS" role="3cqZAp">
-              <node concept="37vLTw" id="HdxW7q$dwT" role="3cqZAk">
-                <ref role="3cqZAo" node="HdxW7q$dwD" resolve="source" />
-              </node>
-            </node>
-          </node>
-          <node concept="3fqX7Q" id="HdxW7q$dwU" role="3clFbw">
-            <node concept="2OqwBi" id="HdxW7q$dwV" role="3fr31v">
-              <node concept="37vLTw" id="HdxW7q$dwW" role="2Oq$k0">
-                <ref role="3cqZAo" node="HdxW7q$dwL" resolve="subs" />
-              </node>
-              <node concept="liA8E" id="HdxW7q$dwX" role="2OqNvi">
-                <ref role="37wK5l" to="yt73:~Substitution.isSuccessful()" resolve="isSuccessful" />
-              </node>
-            </node>
-          </node>
-        </node>
-        <node concept="3clFbH" id="HdxW7q$dwY" role="3cqZAp" />
-        <node concept="3cpWs8" id="HdxW7q$dwZ" role="3cqZAp">
-          <node concept="3cpWsn" id="HdxW7q$dx0" role="3cpWs9">
-            <property role="TrG5h" value="mapper" />
-            <node concept="3uibUv" id="HdxW7q$dx1" role="1tU5fm">
-              <ref role="3uigEE" node="3OPtF02TdNT" resolve="Atom.Mapper" />
-            </node>
-            <node concept="2YIFZM" id="HdxW7q$dx2" role="33vP2m">
-              <ref role="37wK5l" node="5s497VqteR6" resolve="variablesMapper" />
-              <ref role="1Pybhc" node="3OPtF02T8yx" resolve="Mappers" />
-              <node concept="2ShNRf" id="HdxW7q$dx3" role="37wK5m">
-                <node concept="YeOm9" id="HdxW7q$dx4" role="2ShVmc">
-                  <node concept="1Y3b0j" id="HdxW7q$dx5" role="YeSDq">
-                    <property role="2bfB8j" value="true" />
-                    <ref role="1Y3XeK" node="3OPtF031GQe" resolve="Mappers.MapperDelegate" />
-                    <ref role="37wK5l" to="wyt6:~Object.&lt;init&gt;()" resolve="Object" />
-                    <node concept="3Tm1VV" id="HdxW7q$dx6" role="1B3o_S" />
-                    <node concept="2tJIrI" id="HdxW7q$dx7" role="jymVt" />
-                    <node concept="3clFb_" id="HdxW7q$dx8" role="jymVt">
-                      <property role="1EzhhJ" value="false" />
-                      <property role="TrG5h" value="map" />
-                      <node concept="37vLTG" id="HdxW7q$dx9" role="3clF46">
-                        <property role="TrG5h" value="var" />
-                        <node concept="3uibUv" id="HdxW7q$dxa" role="1tU5fm">
-                          <ref role="3uigEE" node="uNmovXiEd4" resolve="Variable" />
-                        </node>
-                      </node>
-                      <node concept="37vLTG" id="HdxW7q$dxb" role="3clF46">
-                        <property role="TrG5h" value="fallback" />
-                        <node concept="3uibUv" id="HdxW7q$dxc" role="1tU5fm">
-                          <ref role="3uigEE" node="3OPtF02TdNT" resolve="Atom.Mapper" />
-                        </node>
-                      </node>
-                      <node concept="3Tm1VV" id="HdxW7q$dxd" role="1B3o_S" />
-                      <node concept="3clFbS" id="HdxW7q$dxe" role="3clF47">
-                        <node concept="3clFbH" id="5PpdwMf$9hm" role="3cqZAp" />
-                        <node concept="1DcWWT" id="HdxW7q$dxf" role="3cqZAp">
-                          <node concept="3clFbS" id="HdxW7q$dxg" role="2LFqv$">
-                            <node concept="3clFbJ" id="HdxW7q$dxh" role="3cqZAp">
-                              <node concept="3clFbS" id="HdxW7q$dxi" role="3clFbx">
-                                <node concept="3SKdUt" id="HdxW7q$dxj" role="3cqZAp">
-                                  <node concept="3SKdUq" id="HdxW7q$dxk" role="3SKWNk">
-                                    <property role="3SKdUp" value="TODO need better generic support in Node inteface" />
-                                  </node>
-                                </node>
-                                <node concept="3cpWs8" id="HdxW7q$dxl" role="3cqZAp">
-                                  <node concept="3cpWsn" id="HdxW7q$dxm" role="3cpWs9">
-                                    <property role="TrG5h" value="node" />
-                                    <node concept="3uibUv" id="573vQv1nQt7" role="1tU5fm">
-                                      <ref role="3uigEE" to="yt73:~Term" resolve="Term" />
-                                    </node>
-                                    <node concept="2OqwBi" id="HdxW7q$dxo" role="33vP2m">
-                                      <node concept="37vLTw" id="HdxW7q$dxp" role="2Oq$k0">
-                                        <ref role="3cqZAo" node="HdxW7q$dxL" resolve="bnd" />
-                                      </node>
-                                      <node concept="liA8E" id="HdxW7q$dxq" role="2OqNvi">
-                                        <ref role="37wK5l" to="yt73:~Substitution.Binding.term()" resolve="term" />
-                                      </node>
-                                    </node>
-                                  </node>
-                                </node>
-                                <node concept="3clFbJ" id="HdxW7q$dxr" role="3cqZAp">
-                                  <node concept="3clFbS" id="HdxW7q$dxs" role="3clFbx">
-                                    <node concept="3cpWs6" id="HdxW7q$dxt" role="3cqZAp">
-                                      <node concept="2OqwBi" id="HdxW7q$dxu" role="3cqZAk">
-                                        <node concept="1eOMI4" id="HdxW7q$dxv" role="2Oq$k0">
-                                          <node concept="10QFUN" id="HdxW7q$dxw" role="1eOMHV">
-                                            <node concept="3uibUv" id="HdxW7q$dxx" role="10QFUM">
-                                              <ref role="3uigEE" node="1bm7a6EXvsP" resolve="Atom" />
-                                            </node>
-                                            <node concept="37vLTw" id="HdxW7q$dxz" role="10QFUP">
-                                              <ref role="3cqZAo" node="HdxW7q$dxm" resolve="node" />
-                                            </node>
-                                          </node>
-                                        </node>
-                                        <node concept="liA8E" id="HdxW7q$dx$" role="2OqNvi">
-                                          <ref role="37wK5l" node="1bm7a6EXvNI" resolve="copyRecursively" />
-                                        </node>
-                                      </node>
-                                    </node>
-                                  </node>
-                                  <node concept="2ZW3vV" id="HdxW7q$dx_" role="3clFbw">
-                                    <node concept="3uibUv" id="HdxW7q$dxA" role="2ZW6by">
-                                      <ref role="3uigEE" node="1bm7a6EXvsP" resolve="Atom" />
-                                    </node>
-                                    <node concept="37vLTw" id="HdxW7q$dxB" role="2ZW6bz">
-                                      <ref role="3cqZAo" node="HdxW7q$dxm" resolve="node" />
-                                    </node>
-                                  </node>
-                                </node>
-                              </node>
-                              <node concept="17R0WA" id="HdxW7q$dxC" role="3clFbw">
-                                <node concept="2OqwBi" id="HdxW7q$dxD" role="3uHU7w">
-                                  <node concept="37vLTw" id="HdxW7q$dxE" role="2Oq$k0">
-                                    <ref role="3cqZAo" node="HdxW7q$dx9" resolve="var" />
-                                  </node>
-                                  <node concept="liA8E" id="HdxW7q$dxF" role="2OqNvi">
-                                    <ref role="37wK5l" node="56MMu0Ark7d" resolve="symbol" />
-                                  </node>
-                                </node>
-                                <node concept="2OqwBi" id="HdxW7q$dxG" role="3uHU7B">
-                                  <node concept="2OqwBi" id="HdxW7q$dxH" role="2Oq$k0">
-                                    <node concept="37vLTw" id="HdxW7q$dxI" role="2Oq$k0">
-                                      <ref role="3cqZAo" node="HdxW7q$dxL" resolve="bnd" />
-                                    </node>
-                                    <node concept="liA8E" id="HdxW7q$dxJ" role="2OqNvi">
-                                      <ref role="37wK5l" to="yt73:~Substitution.Binding.var()" resolve="var" />
-                                    </node>
-                                  </node>
-                                  <node concept="liA8E" id="56MMu0Awf_S" role="2OqNvi">
-                                    <ref role="37wK5l" to="yt73:~Term.symbol()" resolve="symbol" />
-                                  </node>
-                                </node>
-                              </node>
-                            </node>
-                          </node>
-                          <node concept="3cpWsn" id="HdxW7q$dxL" role="1Duv9x">
-                            <property role="TrG5h" value="bnd" />
-                            <node concept="3uibUv" id="HdxW7q$dxM" role="1tU5fm">
-                              <ref role="3uigEE" to="yt73:~Substitution.Binding" resolve="Substitution.Binding" />
-                            </node>
-                          </node>
-                          <node concept="2OqwBi" id="HdxW7q$dxN" role="1DdaDG">
-                            <node concept="37vLTw" id="HdxW7q$dxO" role="2Oq$k0">
-                              <ref role="3cqZAo" node="HdxW7q$dwL" resolve="subs" />
-                            </node>
-                            <node concept="liA8E" id="HdxW7q$dxP" role="2OqNvi">
-                              <ref role="37wK5l" to="yt73:~Substitution.bindings()" resolve="bindings" />
-                            </node>
-                          </node>
-                        </node>
-                        <node concept="3clFbF" id="HdxW7q$dxQ" role="3cqZAp">
-                          <node concept="2OqwBi" id="HdxW7q$dxR" role="3clFbG">
-                            <node concept="37vLTw" id="HdxW7q$dxS" role="2Oq$k0">
-                              <ref role="3cqZAo" node="HdxW7q$dx9" resolve="var" />
-                            </node>
-                            <node concept="liA8E" id="HdxW7q$dxT" role="2OqNvi">
-                              <ref role="37wK5l" node="3OPtF02ULUN" resolve="mapRecursively" />
-                              <node concept="37vLTw" id="HdxW7q$dxU" role="37wK5m">
-                                <ref role="3cqZAo" node="HdxW7q$dxb" resolve="fallback" />
-                              </node>
-                            </node>
-                          </node>
-                        </node>
-                      </node>
-                      <node concept="2AHcQZ" id="HdxW7q$dxV" role="2AJF6D">
-                        <ref role="2AI5Lk" to="wyt6:~Override" resolve="Override" />
-                      </node>
-                      <node concept="3uibUv" id="HdxW7q$dxW" role="3clF45">
-                        <ref role="3uigEE" node="1bm7a6EXvsP" resolve="Atom" />
-                      </node>
-                    </node>
-                    <node concept="2tJIrI" id="HdxW7q$dxY" role="jymVt" />
-                    <node concept="3uibUv" id="HdxW7q$dxZ" role="2Ghqu4">
-                      <ref role="3uigEE" node="uNmovXiEd4" resolve="Variable" />
-                    </node>
-                  </node>
-                </node>
-              </node>
-            </node>
-          </node>
-        </node>
-        <node concept="3clFbH" id="HdxW7q$dy0" role="3cqZAp" />
-        <node concept="3SKdUt" id="HdxW7q$dy1" role="3cqZAp">
-          <node concept="3SKdUq" id="HdxW7q$dy2" role="3SKWNk">
-            <property role="3SKdUp" value="TODO better generic support" />
-          </node>
-        </node>
-        <node concept="3clFbF" id="HdxW7q$dy3" role="3cqZAp">
-          <node concept="2OqwBi" id="HdxW7q$dy5" role="3clFbG">
-            <node concept="37vLTw" id="HdxW7q$dy6" role="2Oq$k0">
-              <ref role="3cqZAo" node="HdxW7q$dyh" resolve="replace" />
-            </node>
-            <node concept="liA8E" id="HdxW7q$dy7" role="2OqNvi">
-              <ref role="37wK5l" node="3OPtF02Tjpr" resolve="mapRecursively" />
-              <node concept="37vLTw" id="HdxW7q$dy8" role="37wK5m">
-                <ref role="3cqZAo" node="HdxW7q$dx0" resolve="mapper" />
-              </node>
-            </node>
-          </node>
-        </node>
-      </node>
-    </node>
-    <node concept="2tJIrI" id="HdxW7q$dyb" role="jymVt" />
-    <node concept="3Tm1VV" id="HdxW7q$dyc" role="1B3o_S" />
-    <node concept="312cEg" id="HdxW7q$dyd" role="jymVt">
-      <property role="TrG5h" value="pattern" />
-      <node concept="3Tm6S6" id="HdxW7q$dye" role="1B3o_S" />
-      <node concept="3uibUv" id="HdxW7q$dyf" role="1tU5fm">
-        <ref role="3uigEE" node="1bm7a6EXvsP" resolve="Atom" />
-      </node>
-    </node>
-    <node concept="312cEg" id="HdxW7q$dyh" role="jymVt">
-      <property role="TrG5h" value="replace" />
-      <node concept="3Tm6S6" id="HdxW7q$dyi" role="1B3o_S" />
-      <node concept="3uibUv" id="HdxW7q$dyj" role="1tU5fm">
-        <ref role="3uigEE" node="1bm7a6EXvsP" resolve="Atom" />
-      </node>
-    </node>
-  </node>
-  <node concept="312cEu" id="5PpdwMfyOkX">
-    <property role="TrG5h" value="PatternProcessor" />
-    <node concept="2tJIrI" id="5PpdwMfyOkY" role="jymVt" />
-    <node concept="2YIFZL" id="5PpdwMfyOkZ" role="jymVt">
-      <property role="TrG5h" value="recursiveWithPatterns" />
-      <node concept="37vLTG" id="5PpdwMfyOl0" role="3clF46">
-        <property role="TrG5h" value="matcher" />
-        <node concept="8X2XB" id="5PpdwMfyOl1" role="1tU5fm">
-          <node concept="3uibUv" id="5PpdwMfyOl2" role="8Xvag">
-            <ref role="3uigEE" node="HdxW7q$dvC" resolve="AtomMatcher" />
-          </node>
-        </node>
-      </node>
-      <node concept="3uibUv" id="5PpdwMfyOl3" role="3clF45">
-        <ref role="3uigEE" node="5PpdwMfyOkX" resolve="PatternProcessor" />
-      </node>
-      <node concept="3Tm1VV" id="5PpdwMfyOl4" role="1B3o_S" />
-      <node concept="3clFbS" id="5PpdwMfyOl5" role="3clF47">
-        <node concept="3clFbF" id="5PpdwMfyOl6" role="3cqZAp">
-          <node concept="2ShNRf" id="5PpdwMfyOl7" role="3clFbG">
-            <node concept="1pGfFk" id="5PpdwMfyOl8" role="2ShVmc">
-              <ref role="37wK5l" node="5PpdwMfyOlp" resolve="PatternProcessor" />
-              <node concept="3clFbT" id="5PpdwMfyOl9" role="37wK5m">
-                <property role="3clFbU" value="true" />
-              </node>
-              <node concept="37vLTw" id="5PpdwMfyOla" role="37wK5m">
-                <ref role="3cqZAo" node="5PpdwMfyOl0" resolve="matcher" />
-              </node>
-            </node>
-          </node>
-        </node>
-      </node>
-    </node>
-    <node concept="2tJIrI" id="5PpdwMfyOlb" role="jymVt" />
-    <node concept="2YIFZL" id="5PpdwMfyOlc" role="jymVt">
-      <property role="TrG5h" value="nonRecursiveWithPatterns" />
-      <node concept="37vLTG" id="5PpdwMfyOld" role="3clF46">
-        <property role="TrG5h" value="matcher" />
-        <node concept="8X2XB" id="5PpdwMfyOle" role="1tU5fm">
-          <node concept="3uibUv" id="5PpdwMfyOlf" role="8Xvag">
-            <ref role="3uigEE" node="HdxW7q$dvC" resolve="AtomMatcher" />
-          </node>
-        </node>
-      </node>
-      <node concept="3uibUv" id="5PpdwMfyOlg" role="3clF45">
-        <ref role="3uigEE" node="5PpdwMfyOkX" resolve="PatternProcessor" />
-      </node>
-      <node concept="3Tm1VV" id="5PpdwMfyOlh" role="1B3o_S" />
-      <node concept="3clFbS" id="5PpdwMfyOli" role="3clF47">
-        <node concept="3clFbF" id="5PpdwMfyOlj" role="3cqZAp">
-          <node concept="2ShNRf" id="5PpdwMfyOlk" role="3clFbG">
-            <node concept="1pGfFk" id="5PpdwMfyOll" role="2ShVmc">
-              <ref role="37wK5l" node="5PpdwMfyOlp" resolve="PatternProcessor" />
-              <node concept="3clFbT" id="5PpdwMfyOlm" role="37wK5m">
-                <property role="3clFbU" value="false" />
-              </node>
-              <node concept="37vLTw" id="5PpdwMfyOln" role="37wK5m">
-                <ref role="3cqZAo" node="5PpdwMfyOld" resolve="matcher" />
-              </node>
-            </node>
-          </node>
-        </node>
-      </node>
-    </node>
-    <node concept="2tJIrI" id="5PpdwMfyOlo" role="jymVt" />
-    <node concept="3clFbW" id="5PpdwMfyOlp" role="jymVt">
-      <node concept="3cqZAl" id="5PpdwMfyOlq" role="3clF45" />
-      <node concept="3Tm1VV" id="5PpdwMfyOlr" role="1B3o_S" />
-      <node concept="3clFbS" id="5PpdwMfyOls" role="3clF47">
-        <node concept="3clFbF" id="5PpdwMfyOlt" role="3cqZAp">
-          <node concept="37vLTI" id="5PpdwMfyOlu" role="3clFbG">
-            <node concept="37vLTw" id="5PpdwMfyOlv" role="37vLTx">
-              <ref role="3cqZAo" node="5PpdwMfyOlA" resolve="recursive" />
-            </node>
-            <node concept="2OqwBi" id="5PpdwMfyOlw" role="37vLTJ">
-              <node concept="Xjq3P" id="5PpdwMfyOlx" role="2Oq$k0" />
-              <node concept="2OwXpG" id="5PpdwMfyOly" role="2OqNvi">
-                <ref role="2Oxat5" node="5PpdwMfyOpN" resolve="recursive" />
-              </node>
-            </node>
-          </node>
-        </node>
-        <node concept="3clFbF" id="5PpdwMfyOlz" role="3cqZAp">
-          <node concept="1rXfSq" id="5PpdwMfyOl$" role="3clFbG">
-            <ref role="37wK5l" node="5PpdwMfyOna" resolve="addPatterns" />
-            <node concept="37vLTw" id="5PpdwMfyOl_" role="37wK5m">
-              <ref role="3cqZAo" node="5PpdwMfyOlC" resolve="matcher" />
-            </node>
-          </node>
-        </node>
-      </node>
-      <node concept="37vLTG" id="5PpdwMfyOlA" role="3clF46">
-        <property role="TrG5h" value="recursive" />
-        <node concept="10P_77" id="5PpdwMfyOlB" role="1tU5fm" />
-      </node>
-      <node concept="37vLTG" id="5PpdwMfyOlC" role="3clF46">
-        <property role="TrG5h" value="matcher" />
-        <node concept="8X2XB" id="5PpdwMfyOlD" role="1tU5fm">
-          <node concept="3uibUv" id="5PpdwMfyOlE" role="8Xvag">
-            <ref role="3uigEE" node="HdxW7q$dvC" resolve="AtomMatcher" />
-          </node>
-        </node>
-      </node>
-    </node>
-    <node concept="2tJIrI" id="5PpdwMfyOlF" role="jymVt" />
-    <node concept="3clFb_" id="5PpdwMfyOlG" role="jymVt">
-      <property role="TrG5h" value="process" />
-      <node concept="37vLTG" id="5PpdwMfyOlH" role="3clF46">
-        <property role="TrG5h" value="tp" />
-        <node concept="3uibUv" id="5PpdwMfyOlI" role="1tU5fm">
-          <ref role="3uigEE" node="1bm7a6EXvsP" resolve="Atom" />
-        </node>
-      </node>
-      <node concept="3uibUv" id="5PpdwMfyOlK" role="3clF45">
-        <ref role="3uigEE" node="1bm7a6EXvsP" resolve="Atom" />
-      </node>
-      <node concept="3Tm1VV" id="5PpdwMfyOlM" role="1B3o_S" />
-      <node concept="3clFbS" id="5PpdwMfyOlN" role="3clF47">
-        <node concept="3cpWs8" id="5PpdwMfyOlO" role="3cqZAp">
-          <node concept="3cpWsn" id="5PpdwMfyOlP" role="3cpWs9">
-            <property role="TrG5h" value="activated" />
-            <node concept="3uibUv" id="5PpdwMfyOlQ" role="1tU5fm">
-              <ref role="3uigEE" to="33ny:~Set" resolve="Set" />
-              <node concept="3uibUv" id="5PpdwMfyOlR" role="11_B2D">
-                <ref role="3uigEE" node="HdxW7q$dvC" resolve="AtomMatcher" />
-              </node>
-            </node>
-            <node concept="2ShNRf" id="5PpdwMfyOlS" role="33vP2m">
-              <node concept="1pGfFk" id="5PpdwMfyOlT" role="2ShVmc">
-                <ref role="37wK5l" to="33ny:~HashSet.&lt;init&gt;()" resolve="HashSet" />
-                <node concept="3uibUv" id="5PpdwMfyOlU" role="1pMfVU">
-                  <ref role="3uigEE" node="HdxW7q$dvC" resolve="AtomMatcher" />
-                </node>
-              </node>
-            </node>
-          </node>
-        </node>
-        <node concept="3cpWs8" id="5PpdwMfyOlV" role="3cqZAp">
-          <node concept="3cpWsn" id="5PpdwMfyOlW" role="3cpWs9">
-            <property role="TrG5h" value="source" />
-            <node concept="3uibUv" id="5PpdwMfyOlX" role="1tU5fm">
-              <ref role="3uigEE" node="1bm7a6EXvsP" resolve="Atom" />
-            </node>
-            <node concept="37vLTw" id="5PpdwMfyOlZ" role="33vP2m">
-              <ref role="3cqZAo" node="5PpdwMfyOlH" resolve="tp" />
-            </node>
-          </node>
-        </node>
-        <node concept="3cpWs8" id="5PpdwMfyOm0" role="3cqZAp">
-          <node concept="3cpWsn" id="5PpdwMfyOm1" role="3cpWs9">
-            <property role="TrG5h" value="active" />
-            <node concept="10P_77" id="5PpdwMfyOm2" role="1tU5fm" />
-          </node>
-        </node>
-        <node concept="MpOyq" id="5PpdwMfyOm3" role="3cqZAp">
-          <node concept="3clFbS" id="5PpdwMfyOm4" role="2LFqv$">
-            <node concept="3clFbF" id="5PpdwMfyOm5" role="3cqZAp">
-              <node concept="37vLTI" id="5PpdwMfyOm6" role="3clFbG">
-                <node concept="3clFbT" id="5PpdwMfyOm7" role="37vLTx">
-                  <property role="3clFbU" value="false" />
-                </node>
-                <node concept="37vLTw" id="5PpdwMfyOm8" role="37vLTJ">
-                  <ref role="3cqZAo" node="5PpdwMfyOm1" resolve="active" />
-                </node>
-              </node>
-            </node>
-            <node concept="1DcWWT" id="5PpdwMfyOm9" role="3cqZAp">
-              <node concept="3clFbS" id="5PpdwMfyOma" role="2LFqv$">
-                <node concept="3clFbJ" id="5PpdwMfyOmb" role="3cqZAp">
-                  <node concept="3clFbS" id="5PpdwMfyOmc" role="3clFbx">
-                    <node concept="3SKdUt" id="5PpdwMfyOmd" role="3cqZAp">
-                      <node concept="3SKdUq" id="5PpdwMfyOme" role="3SKWNk">
-                        <property role="3SKdUp" value="TODO record activation as pair (source, matcher)" />
-                      </node>
-                    </node>
-                    <node concept="3N13vt" id="5PpdwMfyOmf" role="3cqZAp" />
-                  </node>
-                  <node concept="2OqwBi" id="5PpdwMfyOmg" role="3clFbw">
-                    <node concept="37vLTw" id="5PpdwMfyOmh" role="2Oq$k0">
-                      <ref role="3cqZAo" node="5PpdwMfyOlP" resolve="activated" />
-                    </node>
-                    <node concept="liA8E" id="5PpdwMfyOmi" role="2OqNvi">
-                      <ref role="37wK5l" to="33ny:~Set.contains(java.lang.Object):boolean" resolve="contains" />
-                      <node concept="37vLTw" id="5PpdwMfyOmj" role="37wK5m">
-                        <ref role="3cqZAo" node="5PpdwMfyOmI" resolve="matcher" />
-                      </node>
-                    </node>
-                  </node>
-                </node>
-                <node concept="3clFbJ" id="5PpdwMfyOmk" role="3cqZAp">
-                  <node concept="3clFbS" id="5PpdwMfyOml" role="3clFbx">
-                    <node concept="3clFbF" id="5PpdwMfyOmm" role="3cqZAp">
-                      <node concept="37vLTI" id="5PpdwMfyOmn" role="3clFbG">
-                        <node concept="1rXfSq" id="5PpdwMfyOmo" role="37vLTx">
-                          <ref role="37wK5l" node="5PpdwMfyOoI" resolve="replace" />
-                          <node concept="37vLTw" id="5PpdwMfyOmp" role="37wK5m">
-                            <ref role="3cqZAo" node="5PpdwMfyOlW" resolve="source" />
-                          </node>
-                          <node concept="37vLTw" id="5PpdwMfyOmq" role="37wK5m">
-                            <ref role="3cqZAo" node="5PpdwMfyOmI" resolve="matcher" />
-                          </node>
-                        </node>
-                        <node concept="37vLTw" id="5PpdwMfyOmr" role="37vLTJ">
-                          <ref role="3cqZAo" node="5PpdwMfyOlW" resolve="source" />
-                        </node>
-                      </node>
-                    </node>
-                    <node concept="3clFbF" id="5PpdwMfyOms" role="3cqZAp">
-                      <node concept="2OqwBi" id="5PpdwMfyOmt" role="3clFbG">
-                        <node concept="37vLTw" id="5PpdwMfyOmu" role="2Oq$k0">
-                          <ref role="3cqZAo" node="5PpdwMfyOlP" resolve="activated" />
-                        </node>
-                        <node concept="liA8E" id="5PpdwMfyOmv" role="2OqNvi">
-                          <ref role="37wK5l" to="33ny:~Set.add(java.lang.Object):boolean" resolve="add" />
-                          <node concept="37vLTw" id="5PpdwMfyOmw" role="37wK5m">
-                            <ref role="3cqZAo" node="5PpdwMfyOmI" resolve="matcher" />
-                          </node>
-                        </node>
-                      </node>
-                    </node>
-                    <node concept="3clFbF" id="5PpdwMfyOmx" role="3cqZAp">
-                      <node concept="37vLTI" id="5PpdwMfyOmy" role="3clFbG">
-                        <node concept="3clFbT" id="5PpdwMfyOmz" role="37vLTx">
-                          <property role="3clFbU" value="true" />
-                        </node>
-                        <node concept="37vLTw" id="5PpdwMfyOm$" role="37vLTJ">
-                          <ref role="3cqZAo" node="5PpdwMfyOm1" resolve="active" />
-                        </node>
-                      </node>
-                    </node>
-                    <node concept="3zACq4" id="5PpdwMfyOm_" role="3cqZAp" />
-                  </node>
-                  <node concept="3K4zz7" id="5PpdwMfyOmA" role="3clFbw">
-                    <node concept="37vLTw" id="5PpdwMfyOmB" role="3K4Cdx">
-                      <ref role="3cqZAo" node="5PpdwMfyOpN" resolve="recursive" />
-                    </node>
-                    <node concept="1rXfSq" id="5PpdwMfyOmC" role="3K4E3e">
-                      <ref role="37wK5l" node="5PpdwMfyOnL" resolve="matchesAny" />
-                      <node concept="37vLTw" id="5PpdwMfyOmD" role="37wK5m">
-                        <ref role="3cqZAo" node="5PpdwMfyOlW" resolve="source" />
-                      </node>
-                      <node concept="37vLTw" id="5PpdwMfyOmE" role="37wK5m">
-                        <ref role="3cqZAo" node="5PpdwMfyOmI" resolve="matcher" />
-                      </node>
-                    </node>
-                    <node concept="1rXfSq" id="5PpdwMfyOmF" role="3K4GZi">
-                      <ref role="37wK5l" node="5PpdwMfyOov" resolve="matchesOutline" />
-                      <node concept="37vLTw" id="5PpdwMfyOmG" role="37wK5m">
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-      <node concept="37vLTG" id="5PpdwMfyOnv" role="3clF46">
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-      <node concept="37vLTG" id="5PpdwMfyOnP" role="3clF46">
-        <property role="TrG5h" value="matcher" />
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-      <node concept="10P_77" id="5PpdwMfyOnR" role="3clF45" />
-      <node concept="3Tm6S6" id="5PpdwMfyOnS" role="1B3o_S" />
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-          <node concept="3SKdUq" id="5PpdwMfyOnV" role="3SKWNk">
-            <property role="3SKdUp" value="TODO: non-branches?" />
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-          <node concept="3clFbS" id="5PpdwMfyOnX" role="3clFbx">
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-                        <node concept="3clFb_" id="5PpdwMfyOo7" role="jymVt">
-                          <property role="1EzhhJ" value="false" />
-                          <property role="TrG5h" value="matches" />
-                          <node concept="37vLTG" id="5PpdwMfyOo8" role="3clF46">
-                            <property role="TrG5h" value="tp" />
-                            <node concept="3uibUv" id="5PpdwMfyOo9" role="1tU5fm">
-                              <ref role="3uigEE" node="1bm7a6EXvsP" resolve="Atom" />
-                            </node>
-                          </node>
-                          <node concept="10P_77" id="5PpdwMfyOob" role="3clF45" />
-                          <node concept="3Tm1VV" id="5PpdwMfyOoc" role="1B3o_S" />
-                          <node concept="3clFbS" id="5PpdwMfyOod" role="3clF47">
-                            <node concept="3clFbF" id="5PpdwMfyOoe" role="3cqZAp">
-                              <node concept="2OqwBi" id="5PpdwMfyOof" role="3clFbG">
-                                <node concept="37vLTw" id="5PpdwMfyOog" role="2Oq$k0">
-                                  <ref role="3cqZAo" node="5PpdwMfyOnP" resolve="matcher" />
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-                                <node concept="liA8E" id="5PpdwMfyOoh" role="2OqNvi">
-                                  <ref role="37wK5l" node="HdxW7q$dwq" resolve="matches" />
-                                  <node concept="37vLTw" id="5PpdwMfyOoi" role="37wK5m">
-                                    <ref role="3cqZAo" node="5PpdwMfyOo8" resolve="tp" />
-                                  </node>
-                                </node>
-                              </node>
-                            </node>
-                          </node>
-                        </node>
-                        <node concept="3uibUv" id="5PpdwMfyOoj" role="2Ghqu4">
-                          <ref role="3uigEE" node="1bm7a6EXvsP" resolve="Atom" />
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-      <node concept="3Tm6S6" id="5PpdwMfyOoA" role="1B3o_S" />
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-      <node concept="37vLTG" id="5PpdwMfyOoM" role="3clF46">
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-      <node concept="3uibUv" id="5PpdwMfyOoO" role="3clF45">
-        <ref role="3uigEE" node="1bm7a6EXvsP" resolve="Atom" />
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-      <node concept="3Tm6S6" id="5PpdwMfyOoQ" role="1B3o_S" />
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-                      <property role="TrG5h" value="map" />
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-                          <ref role="3uigEE" node="1msb0mq9ID4" resolve="Func" />
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-                          <ref role="3uigEE" node="3OPtF02TdNT" resolve="Atom.Mapper" />
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-                      </node>
-                      <node concept="3Tm1VV" id="5PpdwMfyOp9" role="1B3o_S" />
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-                              <node concept="2OqwBi" id="5PpdwMfyOpg" role="3cqZAk">
-                                <node concept="37vLTw" id="5PpdwMfyOph" role="2Oq$k0">
-                                  <ref role="3cqZAo" node="5PpdwMfyOoM" resolve="matcher" />
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-                                <node concept="liA8E" id="5PpdwMfyOpi" role="2OqNvi">
-                                  <ref role="37wK5l" node="HdxW7q$dwC" resolve="replace" />
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-                                    <ref role="3cqZAo" node="5PpdwMfyOp4" resolve="tp" />
-                                  </node>
-                                </node>
-                              </node>
-                            </node>
-                          </node>
-                          <node concept="2OqwBi" id="5PpdwMfyOpk" role="3clFbw">
-                            <node concept="37vLTw" id="5PpdwMfyOpl" role="2Oq$k0">
-                              <ref role="3cqZAo" node="5PpdwMfyOoM" resolve="matcher" />
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-                            <node concept="liA8E" id="5PpdwMfyOpm" role="2OqNvi">
-                              <ref role="37wK5l" node="HdxW7q$dwq" resolve="matches" />
-                              <node concept="37vLTw" id="5PpdwMfyOpn" role="37wK5m">
-                                <ref role="3cqZAo" node="5PpdwMfyOp4" resolve="tp" />
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-      <node concept="3Tm6S6" id="5PpdwMfyOpO" role="1B3o_S" />
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     <property role="TrG5h" value="Action" />
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@@ -13370,5 +11757,598 @@
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     <node concept="3Tm1VV" id="4peSo3CLajS" role="1B3o_S" />
   </node>
+  <node concept="312cEu" id="3OPtF02T8yx">
+    <property role="TrG5h" value="Mappers" />
+    <node concept="2tJIrI" id="3OPtF02Tc41" role="jymVt" />
+    <node concept="3HP615" id="3OPtF031GQe" role="jymVt">
+      <property role="2bfB8j" value="false" />
+      <property role="TrG5h" value="MapDelegate" />
+      <node concept="3clFb_" id="6HT7BWBOcmA" role="jymVt">
+        <property role="1EzhhJ" value="true" />
+        <property role="TrG5h" value="canMap" />
+        <node concept="37vLTG" id="6HT7BWBOcP5" role="3clF46">
+          <property role="TrG5h" value="atom" />
+          <node concept="3uibUv" id="6HT7BWBOfNy" role="1tU5fm">
+            <ref role="3uigEE" node="1bm7a6EXvsP" resolve="Atom" />
+          </node>
+        </node>
+        <node concept="10P_77" id="6HT7BWBOc_Y" role="3clF45" />
+        <node concept="3Tm1VV" id="6HT7BWBOcmD" role="1B3o_S" />
+        <node concept="3clFbS" id="6HT7BWBOcmE" role="3clF47" />
+      </node>
+      <node concept="3clFb_" id="3OPtF037E1C" role="jymVt">
+        <property role="1EzhhJ" value="true" />
+        <property role="TrG5h" value="map" />
+        <node concept="37vLTG" id="3OPtF037E1D" role="3clF46">
+          <property role="TrG5h" value="atom" />
+          <node concept="3uibUv" id="6HT7BWBOfXe" role="1tU5fm">
+            <ref role="3uigEE" node="1bm7a6EXvsP" resolve="Atom" />
+          </node>
+        </node>
+        <node concept="37vLTG" id="3OPtF037G3a" role="3clF46">
+          <property role="TrG5h" value="fallback" />
+          <node concept="3uibUv" id="3OPtF037G8i" role="1tU5fm">
+            <ref role="3uigEE" node="3OPtF02TdNT" resolve="Atom.Mapper" />
+          </node>
+        </node>
+        <node concept="3Tm1VV" id="3OPtF037E1F" role="1B3o_S" />
+        <node concept="3clFbS" id="3OPtF037E1G" role="3clF47" />
+        <node concept="3uibUv" id="5s497VqzFLM" role="3clF45">
+          <ref role="3uigEE" node="1bm7a6EXvsP" resolve="Atom" />
+        </node>
+      </node>
+      <node concept="3Tm1VV" id="3OPtF031GQf" role="1B3o_S" />
+    </node>
+    <node concept="2tJIrI" id="3OPtF031mnc" role="jymVt" />
+    <node concept="2YIFZL" id="5s497VqteR6" role="jymVt">
+      <property role="TrG5h" value="mapper" />
+      <node concept="37vLTG" id="5s497VqtgPx" role="3clF46">
+        <property role="TrG5h" value="delegate" />
+        <node concept="3uibUv" id="5s497VqtgY1" role="1tU5fm">
+          <ref role="3uigEE" node="3OPtF031GQe" resolve="Mappers.MapDelegate" />
+        </node>
+      </node>
+      <node concept="3uibUv" id="5s497Vq$6sF" role="3clF45">
+        <ref role="3uigEE" node="3OPtF02TdNT" resolve="Atom.Mapper" />
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+      <node concept="3Tm1VV" id="5s497VqteR9" role="1B3o_S" />
+      <node concept="3clFbS" id="5s497VqteRa" role="3clF47">
+        <node concept="3clFbF" id="5s497Vqtqbd" role="3cqZAp">
+          <node concept="2ShNRf" id="5s497Vqtqbb" role="3clFbG">
+            <node concept="1pGfFk" id="5s497VqtqE8" role="2ShVmc">
+              <ref role="37wK5l" node="5s497VqqLbx" resolve="Mappers.AtomMapper" />
+              <node concept="37vLTw" id="5s497VqtqM2" role="37wK5m">
+                <ref role="3cqZAo" node="5s497VqtgPx" resolve="delegate" />
+              </node>
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+          </node>
+        </node>
+      </node>
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+    <node concept="2tJIrI" id="5s497VqtbE$" role="jymVt" />
+    <node concept="312cEu" id="5s497VqqJkg" role="jymVt">
+      <property role="2bfB8j" value="false" />
+      <property role="TrG5h" value="AtomMapper" />
+      <node concept="2tJIrI" id="5s497VqqL8s" role="jymVt" />
+      <node concept="3clFbW" id="5s497VqqLbx" role="jymVt">
+        <node concept="37vLTG" id="5s497Vqr3WN" role="3clF46">
+          <property role="TrG5h" value="delegate" />
+          <node concept="3uibUv" id="5s497Vqrabr" role="1tU5fm">
+            <ref role="3uigEE" node="3OPtF031GQe" resolve="Mappers.MapDelegate" />
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+        <node concept="3cqZAl" id="5s497VqqLbz" role="3clF45" />
+        <node concept="3Tm1VV" id="5s497VqqLb$" role="1B3o_S" />
+        <node concept="3clFbS" id="5s497VqqLb_" role="3clF47">
+          <node concept="3clFbF" id="5s497VqrarO" role="3cqZAp">
+            <node concept="37vLTI" id="5s497VqrarQ" role="3clFbG">
+              <node concept="2OqwBi" id="5s497VqrarU" role="37vLTJ">
+                <node concept="Xjq3P" id="5s497VqrarX" role="2Oq$k0" />
+                <node concept="2OwXpG" id="5s497VqrarT" role="2OqNvi">
+                  <ref role="2Oxat5" node="5s497VqrarK" resolve="delegate" />
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+              <node concept="37vLTw" id="5s497VqrarY" role="37vLTx">
+                <ref role="3cqZAo" node="5s497Vqr3WN" resolve="delegate" />
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+      <node concept="3clFb_" id="5s497VqDhX9" role="jymVt">
+        <property role="1EzhhJ" value="false" />
+        <property role="TrG5h" value="map" />
+        <node concept="37vLTG" id="5s497VqDhXa" role="3clF46">
+          <property role="TrG5h" value="tp" />
+          <node concept="3uibUv" id="5s497VqDhXb" role="1tU5fm">
+            <ref role="3uigEE" node="1bm7a6EXvsP" resolve="Atom" />
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+        <node concept="3Tm1VV" id="5s497VqDhXd" role="1B3o_S" />
+        <node concept="3uibUv" id="5s497VqDhXf" role="3clF45">
+          <ref role="3uigEE" node="1bm7a6EXvsP" resolve="Atom" />
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+        <node concept="3clFbS" id="5s497VqDhXh" role="3clF47">
+          <node concept="3cpWs6" id="5s497VquB$d" role="3cqZAp">
+            <node concept="10QFUN" id="6HT7BWBO8S2" role="3cqZAk">
+              <node concept="3uibUv" id="6HT7BWBO8RX" role="10QFUM">
+                <ref role="3uigEE" node="1bm7a6EXvsP" resolve="Atom" />
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+              <node concept="2OqwBi" id="6HT7BWBO8RY" role="10QFUP">
+                <node concept="37vLTw" id="6HT7BWBO8RZ" role="2Oq$k0">
+                  <ref role="3cqZAo" node="5s497VqDhXa" resolve="tp" />
+                </node>
+                <node concept="liA8E" id="6HT7BWBO8S0" role="2OqNvi">
+                  <ref role="37wK5l" node="104EUzFOBnD" resolve="acceptVisitor" />
+                  <node concept="Xjq3P" id="6HT7BWBO8S1" role="37wK5m" />
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="2AHcQZ" id="5s497VqDj5R" role="2AJF6D">
+          <ref role="2AI5Lk" to="wyt6:~Override" resolve="Override" />
+        </node>
+      </node>
+      <node concept="2tJIrI" id="5s497Vqrc8h" role="jymVt" />
+      <node concept="3clFb_" id="5s497VqraRt" role="jymVt">
+        <property role="1EzhhJ" value="false" />
+        <property role="TrG5h" value="visitTerms" />
+        <node concept="3uibUv" id="5s497VqraRu" role="3clF45">
+          <ref role="3uigEE" to="wyt6:~Object" resolve="Object" />
+        </node>
+        <node concept="3Tm1VV" id="5s497VqraRv" role="1B3o_S" />
+        <node concept="37vLTG" id="5s497VqraRx" role="3clF46">
+          <property role="TrG5h" value="terms" />
+          <node concept="3uibUv" id="5s497VqraRy" role="1tU5fm">
+            <ref role="3uigEE" node="5JQSuNswOXL" resolve="TermFunc" />
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+        </node>
+        <node concept="3clFbS" id="5s497VqraRB" role="3clF47">
+          <node concept="3cpWs6" id="6HT7BWBOiWh" role="3cqZAp">
+            <node concept="1rXfSq" id="6HT7BWBOiWg" role="3cqZAk">
+              <ref role="37wK5l" node="6HT7BWBOiWc" resolve="mapViaDelegate" />
+              <node concept="37vLTw" id="6HT7BWBOiWf" role="37wK5m">
+                <ref role="3cqZAo" node="5s497VqraRx" resolve="terms" />
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+        <node concept="2AHcQZ" id="5s497VqrcoY" role="2AJF6D">
+          <ref role="2AI5Lk" to="wyt6:~Override" resolve="Override" />
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+      <node concept="2tJIrI" id="5s497VqrduJ" role="jymVt" />
+      <node concept="3clFb_" id="5s497VqraRY" role="jymVt">
+        <property role="1EzhhJ" value="false" />
+        <property role="TrG5h" value="visitList" />
+        <node concept="3uibUv" id="5s497VqraRZ" role="3clF45">
+          <ref role="3uigEE" to="wyt6:~Object" resolve="Object" />
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+        <node concept="3Tm1VV" id="5s497VqraS0" role="1B3o_S" />
+        <node concept="37vLTG" id="5s497VqraS2" role="3clF46">
+          <property role="TrG5h" value="list" />
+          <node concept="3uibUv" id="5s497VqraS3" role="1tU5fm">
+            <ref role="3uigEE" node="3OPtF03lco4" resolve="ListFunc" />
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+              <ref role="37wK5l" node="6HT7BWBOiWc" resolve="mapViaDelegate" />
+              <node concept="37vLTw" id="6HT7BWBOnuA" role="37wK5m">
+                <ref role="3cqZAo" node="5s497VqraS2" resolve="list" />
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+        <node concept="2AHcQZ" id="5s497VqrdHQ" role="2AJF6D">
+          <ref role="2AI5Lk" to="wyt6:~Override" resolve="Override" />
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+      <node concept="2tJIrI" id="5s497VqrcAB" role="jymVt" />
+      <node concept="3clFb_" id="5s497VqraRE" role="jymVt">
+        <property role="1EzhhJ" value="false" />
+        <property role="TrG5h" value="visitValues" />
+        <node concept="37vLTG" id="5s497VqraRF" role="3clF46">
+          <property role="TrG5h" value="values" />
+          <node concept="3uibUv" id="5s497VqraRG" role="1tU5fm">
+            <ref role="3uigEE" node="1msb0mq99GH" resolve="ValueFunc" />
+            <node concept="16syzq" id="5s497VqraRH" role="11_B2D">
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+        </node>
+      </node>
+      <node concept="2tJIrI" id="5s497VqraD6" role="jymVt" />
+      <node concept="3clFb_" id="104EUzFJfZX" role="jymVt">
+        <property role="1EzhhJ" value="false" />
+        <property role="TrG5h" value="visitVariable" />
+        <node concept="37vLTG" id="104EUzFJfZY" role="3clF46">
+          <property role="TrG5h" value="variable" />
+          <node concept="3uibUv" id="104EUzFJfZZ" role="1tU5fm">
+            <ref role="3uigEE" node="uNmovXiEd4" resolve="Variable" />
+          </node>
+        </node>
+        <node concept="3uibUv" id="104EUzFJg00" role="3clF45">
+          <ref role="3uigEE" to="wyt6:~Object" resolve="Object" />
+        </node>
+        <node concept="3Tm1VV" id="104EUzFJg01" role="1B3o_S" />
+        <node concept="3clFbS" id="104EUzFJg03" role="3clF47">
+          <node concept="3cpWs6" id="6HT7BWBOp9X" role="3cqZAp">
+            <node concept="1rXfSq" id="6HT7BWBOp9Y" role="3cqZAk">
+              <ref role="37wK5l" node="6HT7BWBOiWc" resolve="mapViaDelegate" />
+              <node concept="37vLTw" id="6HT7BWBOpxQ" role="37wK5m">
+                <ref role="3cqZAo" node="104EUzFJfZY" resolve="variable" />
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="2AHcQZ" id="104EUzFJkEG" role="2AJF6D">
+          <ref role="2AI5Lk" to="wyt6:~Override" resolve="Override" />
+        </node>
+      </node>
+      <node concept="2tJIrI" id="104EUzFJhb8" role="jymVt" />
+      <node concept="3clFb_" id="6HT7BWBOiWc" role="jymVt">
+        <property role="TrG5h" value="mapViaDelegate" />
+        <node concept="3Tm6S6" id="6HT7BWBOiWd" role="1B3o_S" />
+        <node concept="3uibUv" id="6HT7BWBOiWe" role="3clF45">
+          <ref role="3uigEE" to="wyt6:~Object" resolve="Object" />
+        </node>
+        <node concept="37vLTG" id="6HT7BWBOiW5" role="3clF46">
+          <property role="TrG5h" value="atom" />
+          <node concept="3uibUv" id="6HT7BWBOkDZ" role="1tU5fm">
+            <ref role="3uigEE" node="1bm7a6EXvsP" resolve="Atom" />
+          </node>
+        </node>
+        <node concept="3clFbS" id="6HT7BWBOiVL" role="3clF47">
+          <node concept="3clFbJ" id="6HT7BWBOiVM" role="3cqZAp">
+            <node concept="3clFbS" id="6HT7BWBOiVN" role="3clFbx">
+              <node concept="3cpWs6" id="6HT7BWBOiVO" role="3cqZAp">
+                <node concept="2OqwBi" id="6HT7BWBOiVP" role="3cqZAk">
+                  <node concept="37vLTw" id="6HT7BWBOiVQ" role="2Oq$k0">
+                    <ref role="3cqZAo" node="5s497VqrarK" resolve="delegate" />
+                  </node>
+                  <node concept="liA8E" id="6HT7BWBOiVR" role="2OqNvi">
+                    <ref role="37wK5l" node="3OPtF037E1C" resolve="map" />
+                    <node concept="37vLTw" id="6HT7BWBOiW8" role="37wK5m">
+                      <ref role="3cqZAo" node="6HT7BWBOiW5" resolve="atom" />
+                    </node>
+                    <node concept="Xjq3P" id="6HT7BWBOiVT" role="37wK5m" />
+                  </node>
+                </node>
+              </node>
+            </node>
+            <node concept="2OqwBi" id="6HT7BWBOiVU" role="3clFbw">
+              <node concept="37vLTw" id="6HT7BWBOiVV" role="2Oq$k0">
+                <ref role="3cqZAo" node="5s497VqrarK" resolve="delegate" />
+              </node>
+              <node concept="liA8E" id="6HT7BWBOiVW" role="2OqNvi">
+                <ref role="37wK5l" node="6HT7BWBOcmA" resolve="canMap" />
+                <node concept="37vLTw" id="6HT7BWBOiW9" role="37wK5m">
+                  <ref role="3cqZAo" node="6HT7BWBOiW5" resolve="atom" />
+                </node>
+              </node>
+            </node>
+            <node concept="9aQIb" id="6HT7BWBOiVY" role="9aQIa">
+              <node concept="3clFbS" id="6HT7BWBOiVZ" role="9aQI4">
+                <node concept="3cpWs6" id="6HT7BWBOiW0" role="3cqZAp">
+                  <node concept="2OqwBi" id="6HT7BWBOiW1" role="3cqZAk">
+                    <node concept="37vLTw" id="6HT7BWBOiW7" role="2Oq$k0">
+                      <ref role="3cqZAo" node="6HT7BWBOiW5" resolve="atom" />
+                    </node>
+                    <node concept="liA8E" id="6HT7BWBOiW3" role="2OqNvi">
+                      <ref role="37wK5l" node="3OPtF02Tjpr" resolve="mapRecursively" />
+                      <node concept="Xjq3P" id="6HT7BWBOiW4" role="37wK5m" />
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="2tJIrI" id="6HT7BWBOksZ" role="jymVt" />
+      <node concept="3Tm6S6" id="5s497VqtaGv" role="1B3o_S" />
+      <node concept="3uibUv" id="5s497VqqKLX" role="EKbjA">
+        <ref role="3uigEE" node="3OPtF02TdNT" resolve="Atom.Mapper" />
+      </node>
+      <node concept="3uibUv" id="5s497VqqKYG" role="EKbjA">
+        <ref role="3uigEE" node="104EUzFOARB" resolve="Atom.Visitor" />
+      </node>
+      <node concept="312cEg" id="5s497VqrarK" role="jymVt">
+        <property role="TrG5h" value="delegate" />
+        <node concept="3Tm6S6" id="5s497VqrarL" role="1B3o_S" />
+        <node concept="3uibUv" id="5s497VqrarN" role="1tU5fm">
+          <ref role="3uigEE" node="3OPtF031GQe" resolve="Mappers.MapDelegate" />
+        </node>
+      </node>
+    </node>
+    <node concept="2tJIrI" id="5s497VqqG$D" role="jymVt" />
+    <node concept="3Tm1VV" id="3OPtF02T8yy" role="1B3o_S" />
+  </node>
+  <node concept="312cEu" id="6HT7BWBOXme">
+    <property role="TrG5h" value="AtomUtil" />
+    <node concept="2tJIrI" id="6HT7BWBPagm" role="jymVt" />
+    <node concept="Wx3nA" id="6HT7BWBPbsi" role="jymVt">
+      <property role="IEkAT" value="false" />
+      <property role="TrG5h" value="GROUND" />
+      <property role="3TUv4t" value="true" />
+      <node concept="3uibUv" id="6HT7BWBPa9D" role="1tU5fm">
+        <ref role="3uigEE" node="3OPtF031GQe" resolve="Mappers.MapDelegate" />
+      </node>
+      <node concept="3Tm6S6" id="6HT7BWBPa9C" role="1B3o_S" />
+      <node concept="2ShNRf" id="6HT7BWBPa9E" role="33vP2m">
+        <node concept="YeOm9" id="6HT7BWBPa9F" role="2ShVmc">
+          <node concept="1Y3b0j" id="6HT7BWBPa9G" role="YeSDq">
+            <property role="2bfB8j" value="true" />
+            <ref role="1Y3XeK" node="3OPtF031GQe" resolve="Mappers.MapDelegate" />
+            <ref role="37wK5l" to="wyt6:~Object.&lt;init&gt;()" resolve="Object" />
+            <node concept="3Tm1VV" id="6HT7BWBPa9H" role="1B3o_S" />
+            <node concept="3clFb_" id="6HT7BWBPa9I" role="jymVt">
+              <property role="1EzhhJ" value="false" />
+              <property role="TrG5h" value="canMap" />
+              <node concept="37vLTG" id="6HT7BWBPa9J" role="3clF46">
+                <property role="TrG5h" value="atom" />
+                <node concept="3uibUv" id="6HT7BWBPa9K" role="1tU5fm">
+                  <ref role="3uigEE" node="1bm7a6EXvsP" resolve="Atom" />
+                </node>
+              </node>
+              <node concept="10P_77" id="6HT7BWBPa9L" role="3clF45" />
+              <node concept="3Tm1VV" id="6HT7BWBPa9M" role="1B3o_S" />
+              <node concept="3clFbS" id="6HT7BWBPa9N" role="3clF47">
+                <node concept="3clFbF" id="6HT7BWBQdtU" role="3cqZAp">
+                  <node concept="3clFbC" id="6HT7BWBQeoD" role="3clFbG">
+                    <node concept="10M0yZ" id="6HT7BWBQekA" role="3uHU7B">
+                      <ref role="1PxDUh" to="wyt6:~Boolean" resolve="Boolean" />
+                      <ref role="3cqZAo" to="wyt6:~Boolean.TRUE" resolve="TRUE" />
+                    </node>
+                    <node concept="2OqwBi" id="6HT7BWBQdzA" role="3uHU7w">
+                      <node concept="37vLTw" id="6HT7BWBQdtS" role="2Oq$k0">
+                        <ref role="3cqZAo" node="6HT7BWBPa9J" resolve="atom" />
+                      </node>
+                      <node concept="liA8E" id="6HT7BWBQdDR" role="2OqNvi">
+                        <ref role="37wK5l" node="104EUzFOBnD" resolve="acceptVisitor" />
+                        <node concept="2ShNRf" id="6HT7BWBQdEF" role="37wK5m">
+                          <node concept="YeOm9" id="6HT7BWBQdQT" role="2ShVmc">
+                            <node concept="1Y3b0j" id="6HT7BWBQdQW" role="YeSDq">
+                              <property role="2bfB8j" value="true" />
+                              <ref role="1Y3XeK" node="6HT7BWBQcxv" resolve="Atom.Visitor.Stub" />
+                              <ref role="37wK5l" to="wyt6:~Object.&lt;init&gt;()" resolve="Object" />
+                              <node concept="3Tm1VV" id="6HT7BWBQdQX" role="1B3o_S" />
+                              <node concept="3clFb_" id="6HT7BWBQdTD" role="jymVt">
+                                <property role="1EzhhJ" value="false" />
+                                <property role="TrG5h" value="visitVariable" />
+                                <node concept="37vLTG" id="6HT7BWBQdTE" role="3clF46">
+                                  <property role="TrG5h" value="variable" />
+                                  <node concept="3uibUv" id="6HT7BWBQdTF" role="1tU5fm">
+                                    <ref role="3uigEE" node="uNmovXiEd4" resolve="Variable" />
+                                  </node>
+                                </node>
+                                <node concept="3uibUv" id="6HT7BWBQdTG" role="3clF45">
+                                  <ref role="3uigEE" to="wyt6:~Object" resolve="Object" />
+                                </node>
+                                <node concept="3Tm1VV" id="6HT7BWBQdTH" role="1B3o_S" />
+                                <node concept="2AHcQZ" id="6HT7BWBQdTL" role="2AJF6D">
+                                  <ref role="2AI5Lk" to="wyt6:~Override" resolve="Override" />
+                                </node>
+                                <node concept="3clFbS" id="6HT7BWBQdTN" role="3clF47">
+                                  <node concept="3SKdUt" id="6HT7BWBQity" role="3cqZAp">
+                                    <node concept="3SKdUq" id="6HT7BWBQiuw" role="3SKWNk">
+                                      <property role="3SKdUp" value="FIXME: this is a dirty hack. using the fact that bound logical variableshas this kind" />
+                                    </node>
+                                  </node>
+                                  <node concept="3clFbF" id="6HT7BWBQhKS" role="3cqZAp">
+                                    <node concept="2YIFZM" id="6HT7BWBQhLO" role="3clFbG">
+                                      <ref role="1Pybhc" to="wyt6:~Boolean" resolve="Boolean" />
+                                      <ref role="37wK5l" to="wyt6:~Boolean.valueOf(boolean):java.lang.Boolean" resolve="valueOf" />
+                                      <node concept="2OqwBi" id="6HT7BWBPayz" role="37wK5m">
+                                        <node concept="37vLTw" id="6HT7BWBQi7L" role="2Oq$k0">
+                                          <ref role="3cqZAo" node="6HT7BWBQdTE" resolve="variable" />
+                                        </node>
+                                        <node concept="liA8E" id="6HT7BWBPa_D" role="2OqNvi">
+                                          <ref role="37wK5l" node="56MMu0Ark7C" resolve="is" />
+                                          <node concept="Rm8GO" id="6HT7BWBPaIr" role="37wK5m">
+                                            <ref role="1Px2BO" to="yt73:~Term.Kind" resolve="Term.Kind" />
+                                            <ref role="Rm8GQ" to="yt73:~Term.REF" resolve="REF" />
+                                          </node>
+                                        </node>
+                                      </node>
+                                    </node>
+                                  </node>
+                                </node>
+                              </node>
+                            </node>
+                          </node>
+                        </node>
+                      </node>
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+            <node concept="3clFb_" id="6HT7BWBPa9O" role="jymVt">
+              <property role="1EzhhJ" value="false" />
+              <property role="TrG5h" value="map" />
+              <node concept="37vLTG" id="6HT7BWBPa9P" role="3clF46">
+                <property role="TrG5h" value="atom" />
+                <node concept="3uibUv" id="6HT7BWBPa9Q" role="1tU5fm">
+                  <ref role="3uigEE" node="1bm7a6EXvsP" resolve="Atom" />
+                </node>
+              </node>
+              <node concept="37vLTG" id="6HT7BWBPa9R" role="3clF46">
+                <property role="TrG5h" value="fallback" />
+                <node concept="3uibUv" id="6HT7BWBPa9S" role="1tU5fm">
+                  <ref role="3uigEE" node="3OPtF02TdNT" resolve="Atom.Mapper" />
+                </node>
+              </node>
+              <node concept="3Tm1VV" id="6HT7BWBPa9T" role="1B3o_S" />
+              <node concept="3uibUv" id="6HT7BWBPa9U" role="3clF45">
+                <ref role="3uigEE" node="1bm7a6EXvsP" resolve="Atom" />
+              </node>
+              <node concept="3clFbS" id="6HT7BWBPa9V" role="3clF47">
+                <node concept="3SKdUt" id="6HT7BWBQfQY" role="3cqZAp">
+                  <node concept="3SKdUq" id="6HT7BWBQfRs" role="3SKWNk">
+                    <property role="3SKdUp" value="FIXME: get() has a somewhat different semantics, introduce a new method maybe?" />
+                  </node>
+                </node>
+                <node concept="3cpWs8" id="6HT7BWBRA2w" role="3cqZAp">
+                  <node concept="3cpWsn" id="6HT7BWBRA2x" role="3cpWs9">
+                    <property role="TrG5h" value="val" />
+                    <node concept="3uibUv" id="6HT7BWBRA2u" role="1tU5fm">
+                      <ref role="3uigEE" node="1bm7a6EXvsP" resolve="Atom" />
+                    </node>
+                    <node concept="10QFUN" id="6HT7BWBRA2y" role="33vP2m">
+                      <node concept="2OqwBi" id="6HT7BWBRA2z" role="10QFUP">
+                        <node concept="37vLTw" id="6HT7BWBRA2$" role="2Oq$k0">
+                          <ref role="3cqZAo" node="6HT7BWBPa9P" resolve="atom" />
+                        </node>
+                        <node concept="liA8E" id="6HT7BWBRA2_" role="2OqNvi">
+                          <ref role="37wK5l" to="yt73:~Term.get()" resolve="get" />
+                        </node>
+                      </node>
+                      <node concept="3uibUv" id="6HT7BWBRA2A" role="10QFUM">
+                        <ref role="3uigEE" node="1bm7a6EXvsP" resolve="Atom" />
+                      </node>
+                    </node>
+                  </node>
+                </node>
+                <node concept="3clFbF" id="6HT7BWBPaOU" role="3cqZAp">
+                  <node concept="2OqwBi" id="6HT7BWBRAc1" role="3clFbG">
+                    <node concept="37vLTw" id="6HT7BWBRA2B" role="2Oq$k0">
+                      <ref role="3cqZAo" node="6HT7BWBRA2x" resolve="val" />
+                    </node>
+                    <node concept="liA8E" id="6HT7BWBRAii" role="2OqNvi">
+                      <ref role="37wK5l" node="1bm7a6EXvNI" resolve="copyRecursively" />
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+    </node>
+    <node concept="2tJIrI" id="6HT7BWBOXmP" role="jymVt" />
+    <node concept="2YIFZL" id="6HT7BWBOXr$" role="jymVt">
+      <property role="TrG5h" value="ground" />
+      <property role="IEkAT" value="false" />
+      <property role="DiZV1" value="false" />
+      <property role="od$2w" value="false" />
+      <node concept="37vLTG" id="6HT7BWBOXuV" role="3clF46">
+        <property role="TrG5h" value="atom" />
+        <node concept="3uibUv" id="6HT7BWBOXvt" role="1tU5fm">
+          <ref role="3uigEE" node="1bm7a6EXvsP" resolve="Atom" />
+        </node>
+      </node>
+      <node concept="3clFbS" id="6HT7BWBOXna" role="3clF47">
+        <node concept="3clFbF" id="6HT7BWBOXzd" role="3cqZAp">
+          <node concept="2OqwBi" id="6HT7BWBPbh7" role="3clFbG">
+            <node concept="2YIFZM" id="6HT7BWBOXzs" role="2Oq$k0">
+              <ref role="37wK5l" node="5s497VqteR6" resolve="mapper" />
+              <ref role="1Pybhc" node="3OPtF02T8yx" resolve="Mappers" />
+              <node concept="37vLTw" id="6HT7BWBPbDQ" role="37wK5m">
+                <ref role="3cqZAo" node="6HT7BWBPbsi" resolve="GROUND" />
+              </node>
+            </node>
+            <node concept="liA8E" id="6HT7BWBPbjK" role="2OqNvi">
+              <ref role="37wK5l" node="3OPtF02TgQt" resolve="map" />
+              <node concept="37vLTw" id="6HT7BWBPbkG" role="37wK5m">
+                <ref role="3cqZAo" node="6HT7BWBOXuV" resolve="atom" />
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="3uibUv" id="6HT7BWBOXnN" role="3clF45">
+        <ref role="3uigEE" node="1bm7a6EXvsP" resolve="Atom" />
+      </node>
+      <node concept="3Tm1VV" id="6HT7BWBOXn9" role="1B3o_S" />
+    </node>
+    <node concept="2tJIrI" id="6HT7BWBOXmW" role="jymVt" />
+    <node concept="3Tm1VV" id="6HT7BWBOXmf" role="1B3o_S" />
+  </node>
 </model>
 
diff --git a/languages/jetbrains.mps.logic/test/models/jetbrains/mps/logic/test/logical.mps b/languages/jetbrains.mps.logic/test/models/jetbrains/mps/logic/test/logical.mps
index b7eae8dd..464c0e5a 100644
--- a/languages/jetbrains.mps.logic/test/models/jetbrains/mps/logic/test/logical.mps
+++ b/languages/jetbrains.mps.logic/test/models/jetbrains/mps/logic/test/logical.mps
@@ -167,11 +167,11 @@
       </concept>
     </language>
     <language id="35320f26-77cb-4c55-be9f-a97a27770af1" name="jetbrains.mps.logic">
-      <concept id="238586457668550951" name="jetbrains.mps.logic.structure.LogicalSubstitution" flags="ng" index="22Ky0T">
+      <concept id="238586457668550951" name="jetbrains.mps.logic.structure.Splice" flags="ng" index="22Ky0T">
         <child id="238586457668550958" name="expression" index="22Ky0K" />
       </concept>
       <concept id="1564179198502666296" name="jetbrains.mps.logic.structure.LogicalType" flags="ig" index="26uTi9" />
-      <concept id="2105510410850132386" name="jetbrains.mps.logic.structure.ListNode" flags="ng" index="KCUsM">
+      <concept id="2105510410850132386" name="jetbrains.mps.logic.structure.List" flags="ng" index="KCUsM">
         <child id="2105510410850136264" name="contents" index="KCVpo" />
       </concept>
       <concept id="7571593955706120730" name="jetbrains.mps.logic.structure.Ast" flags="ng" index="1oi1Uc">
@@ -189,7 +189,7 @@
       <concept id="7571593955706137472" name="jetbrains.mps.logic.structure.ValueRole" flags="ng" index="1oi5Wm">
         <child id="7571593955706137672" name="contents" index="1oi5zu" />
       </concept>
-      <concept id="7571593955706137573" name="jetbrains.mps.logic.structure.ValueHolder" flags="ng" index="1oi5XN">
+      <concept id="7571593955706137573" name="jetbrains.mps.logic.structure.Value" flags="ng" index="1oi5XN">
         <property id="7571593955706137638" name="value" index="1oi5yK" />
       </concept>
     </language>
@@ -713,8 +713,12 @@
           </node>
           <node concept="3clFbH" id="dfChU1g_bE" role="3cqZAp" />
           <node concept="3vlDli" id="dfChU1g_hx" role="3cqZAp">
-            <node concept="37vLTw" id="dfChU1g_kG" role="3tpDZA">
-              <ref role="3cqZAo" node="dfChU1g_fG" resolve="b" />
+            <node concept="2YIFZM" id="6HT7BWBPqFA" role="3tpDZA">
+              <ref role="37wK5l" to="ie8e:6HT7BWBOXr$" resolve="ground" />
+              <ref role="1Pybhc" to="ie8e:6HT7BWBOXme" resolve="AtomUtil" />
+              <node concept="37vLTw" id="6HT7BWBPqG2" role="37wK5m">
+                <ref role="3cqZAo" node="dfChU1g_fG" resolve="b" />
+              </node>
             </node>
             <node concept="37vLTw" id="dfChU1g_k6" role="3tpDZB">
               <ref role="3cqZAo" node="dfChU1g_c$" resolve="a" />
@@ -816,12 +820,16 @@
           </node>
           <node concept="3clFbH" id="1OShD0HAz4f" role="3cqZAp" />
           <node concept="3vlDli" id="1OShD0HAz4g" role="3cqZAp">
-            <node concept="37vLTw" id="1OShD0HAz4h" role="3tpDZA">
-              <ref role="3cqZAo" node="1OShD0HAz47" resolve="b" />
-            </node>
             <node concept="37vLTw" id="1OShD0HAz4i" role="3tpDZB">
               <ref role="3cqZAo" node="1OShD0HAz3X" resolve="a" />
             </node>
+            <node concept="2YIFZM" id="6HT7BWBPrIq" role="3tpDZA">
+              <ref role="37wK5l" to="ie8e:6HT7BWBOXr$" resolve="ground" />
+              <ref role="1Pybhc" to="ie8e:6HT7BWBOXme" resolve="AtomUtil" />
+              <node concept="37vLTw" id="6HT7BWBPrIr" role="37wK5m">
+                <ref role="3cqZAo" node="1OShD0HAz47" resolve="b" />
+              </node>
+            </node>
           </node>
         </node>
       </node>
@@ -923,12 +931,16 @@
           </node>
           <node concept="3clFbH" id="1OShD0HRNpd" role="3cqZAp" />
           <node concept="3vlDli" id="1OShD0HRNpe" role="3cqZAp">
-            <node concept="37vLTw" id="1OShD0HRNpf" role="3tpDZA">
-              <ref role="3cqZAo" node="1OShD0HRNp2" resolve="b" />
-            </node>
             <node concept="37vLTw" id="1OShD0HRNpg" role="3tpDZB">
               <ref role="3cqZAo" node="1OShD0HRNoP" resolve="a" />
             </node>
+            <node concept="2YIFZM" id="6HT7BWBSfTf" role="3tpDZA">
+              <ref role="37wK5l" to="ie8e:6HT7BWBOXr$" resolve="ground" />
+              <ref role="1Pybhc" to="ie8e:6HT7BWBOXme" resolve="AtomUtil" />
+              <node concept="37vLTw" id="6HT7BWBSfTg" role="37wK5m">
+                <ref role="3cqZAo" node="1OShD0HRNp2" resolve="b" />
+              </node>
+            </node>
           </node>
         </node>
       </node>
@@ -996,12 +1008,16 @@
           </node>
           <node concept="3clFbH" id="1OShD0Ifj4U" role="3cqZAp" />
           <node concept="3vlDli" id="1OShD0Ifj4V" role="3cqZAp">
-            <node concept="37vLTw" id="1OShD0Ifj4W" role="3tpDZA">
-              <ref role="3cqZAo" node="1OShD0Ifj4M" resolve="b" />
-            </node>
             <node concept="37vLTw" id="1OShD0Ifj4X" role="3tpDZB">
               <ref role="3cqZAo" node="1OShD0Ifj4$" resolve="a" />
             </node>
+            <node concept="2YIFZM" id="6HT7BWBPrJ8" role="3tpDZA">
+              <ref role="37wK5l" to="ie8e:6HT7BWBOXr$" resolve="ground" />
+              <ref role="1Pybhc" to="ie8e:6HT7BWBOXme" resolve="AtomUtil" />
+              <node concept="37vLTw" id="6HT7BWBPrJ9" role="37wK5m">
+                <ref role="3cqZAo" node="1OShD0Ifj4M" resolve="b" />
+              </node>
+            </node>
           </node>
         </node>
       </node>
@@ -1084,12 +1100,16 @@
           </node>
           <node concept="3clFbH" id="dfChU1yMl_" role="3cqZAp" />
           <node concept="3vlDli" id="dfChU1yMlA" role="3cqZAp">
-            <node concept="37vLTw" id="dfChU1yMlB" role="3tpDZA">
-              <ref role="3cqZAo" node="dfChU1yMlu" resolve="b" />
-            </node>
             <node concept="37vLTw" id="dfChU1yMlC" role="3tpDZB">
               <ref role="3cqZAo" node="dfChU1yMlk" resolve="a" />
             </node>
+            <node concept="2YIFZM" id="6HT7BWBPrJv" role="3tpDZA">
+              <ref role="37wK5l" to="ie8e:6HT7BWBOXr$" resolve="ground" />
+              <ref role="1Pybhc" to="ie8e:6HT7BWBOXme" resolve="AtomUtil" />
+              <node concept="37vLTw" id="6HT7BWBPrJw" role="37wK5m">
+                <ref role="3cqZAo" node="dfChU1yMlu" resolve="b" />
+              </node>
+            </node>
           </node>
         </node>
       </node>
@@ -1156,12 +1176,16 @@
           </node>
           <node concept="3clFbH" id="dfChU1DQLI" role="3cqZAp" />
           <node concept="3vlDli" id="dfChU1DQLJ" role="3cqZAp">
-            <node concept="37vLTw" id="dfChU1DQLK" role="3tpDZA">
-              <ref role="3cqZAo" node="dfChU1DQLB" resolve="b" />
-            </node>
             <node concept="37vLTw" id="dfChU1DQLL" role="3tpDZB">
               <ref role="3cqZAo" node="dfChU1DQLv" resolve="a" />
             </node>
+            <node concept="2YIFZM" id="6HT7BWBPrJQ" role="3tpDZA">
+              <ref role="37wK5l" to="ie8e:6HT7BWBOXr$" resolve="ground" />
+              <ref role="1Pybhc" to="ie8e:6HT7BWBOXme" resolve="AtomUtil" />
+              <node concept="37vLTw" id="6HT7BWBPrJR" role="37wK5m">
+                <ref role="3cqZAo" node="dfChU1DQLB" resolve="b" />
+              </node>
+            </node>
           </node>
         </node>
       </node>
@@ -1242,12 +1266,16 @@
           </node>
           <node concept="3clFbH" id="2S_ORi38QgI" role="3cqZAp" />
           <node concept="3vlDli" id="2S_ORi38QgJ" role="3cqZAp">
-            <node concept="37vLTw" id="2S_ORi38QgK" role="3tpDZA">
-              <ref role="3cqZAo" node="2S_ORi38Qg$" resolve="b" />
-            </node>
             <node concept="37vLTw" id="2S_ORi38QgL" role="3tpDZB">
               <ref role="3cqZAo" node="2S_ORi38Qgq" resolve="a" />
             </node>
+            <node concept="2YIFZM" id="6HT7BWBPrKd" role="3tpDZA">
+              <ref role="37wK5l" to="ie8e:6HT7BWBOXr$" resolve="ground" />
+              <ref role="1Pybhc" to="ie8e:6HT7BWBOXme" resolve="AtomUtil" />
+              <node concept="37vLTw" id="6HT7BWBPrKe" role="37wK5m">
+                <ref role="3cqZAo" node="2S_ORi38Qg$" resolve="b" />
+              </node>
+            </node>
           </node>
         </node>
       </node>
diff --git a/languages/jetbrains.mps.logic/test/models/jetbrains/mps/logic/test/unification.mps b/languages/jetbrains.mps.logic/test/models/jetbrains/mps/logic/test/unification.mps
index 493c7275..e4648778 100644
--- a/languages/jetbrains.mps.logic/test/models/jetbrains/mps/logic/test/unification.mps
+++ b/languages/jetbrains.mps.logic/test/models/jetbrains/mps/logic/test/unification.mps
@@ -14,6 +14,7 @@
     <import index="ie8e" ref="r:ab2605ab-b4bc-4e80-a8ca-19a4a8465c01(jetbrains.mps.logic.atom)" />
     <import index="yt73" ref="7526e0cf-1ce7-46f8-a555-9eca1e06c23b/java:jetbrains.mps.unification(jetbrains.mps.unification.tree/)" />
     <import index="yg8f" ref="r:e213377a-f1a7-4ba7-9d08-96bcb97ed8ce(jetbrains.mps.logic.builtin)" />
+    <import index="33ny" ref="6354ebe7-c22a-4a0f-ac54-50b52ab9b065/java:java.util(JDK/)" />
   </imports>
   <registry>
     <language id="f3061a53-9226-4cc5-a443-f952ceaf5816" name="jetbrains.mps.baseLanguage">
@@ -36,6 +37,9 @@
       <concept id="1070475926800" name="jetbrains.mps.baseLanguage.structure.StringLiteral" flags="nn" index="Xl_RD">
         <property id="1070475926801" name="value" index="Xl_RC" />
       </concept>
+      <concept id="1081236700937" name="jetbrains.mps.baseLanguage.structure.StaticMethodCall" flags="nn" index="2YIFZM">
+        <reference id="1144433194310" name="classConcept" index="1Pybhc" />
+      </concept>
       <concept id="1070534058343" name="jetbrains.mps.baseLanguage.structure.NullLiteral" flags="nn" index="10Nm6u" />
       <concept id="1070534934090" name="jetbrains.mps.baseLanguage.structure.CastExpression" flags="nn" index="10QFUN">
         <child id="1070534934091" name="type" index="10QFUM" />
@@ -70,6 +74,9 @@
       <concept id="1068580123137" name="jetbrains.mps.baseLanguage.structure.BooleanConstant" flags="nn" index="3clFbT">
         <property id="1068580123138" name="value" index="3clFbU" />
       </concept>
+      <concept id="1068580320020" name="jetbrains.mps.baseLanguage.structure.IntegerConstant" flags="nn" index="3cmrfG">
+        <property id="1068580320021" name="value" index="3cmrfH" />
+      </concept>
       <concept id="1068581242864" name="jetbrains.mps.baseLanguage.structure.LocalVariableDeclarationStatement" flags="nn" index="3cpWs8">
         <child id="1068581242865" name="localVariableDeclaration" index="3cpWs9" />
       </concept>
@@ -82,11 +89,16 @@
         <reference id="1068499141037" name="baseMethodDeclaration" index="37wK5l" />
         <child id="1068499141038" name="actualArgument" index="37wK5m" />
       </concept>
-      <concept id="1212685548494" name="jetbrains.mps.baseLanguage.structure.ClassCreator" flags="nn" index="1pGfFk" />
+      <concept id="1212685548494" name="jetbrains.mps.baseLanguage.structure.ClassCreator" flags="nn" index="1pGfFk">
+        <child id="1212687122400" name="typeParameter" index="1pMfVU" />
+      </concept>
       <concept id="1107461130800" name="jetbrains.mps.baseLanguage.structure.Classifier" flags="ng" index="3pOWGL">
         <child id="5375687026011219971" name="member" index="jymVt" unordered="true" />
       </concept>
       <concept id="1171903607971" name="jetbrains.mps.baseLanguage.structure.WildCardType" flags="in" index="3qTvmN" />
+      <concept id="1171903916106" name="jetbrains.mps.baseLanguage.structure.UpperBoundType" flags="in" index="3qUE_q">
+        <child id="1171903916107" name="bound" index="3qUE_r" />
+      </concept>
       <concept id="7812454656619025412" name="jetbrains.mps.baseLanguage.structure.LocalMethodCall" flags="nn" index="1rXfSq" />
       <concept id="1107535904670" name="jetbrains.mps.baseLanguage.structure.ClassifierType" flags="in" index="3uibUv">
         <reference id="1107535924139" name="classifier" index="3uigEE" />
@@ -133,10 +145,10 @@
       <concept id="8243879142738613213" name="jetbrains.mps.baseLanguage.unitTest.structure.AfterTest" flags="in" index="1KhZuU" />
     </language>
     <language id="35320f26-77cb-4c55-be9f-a97a27770af1" name="jetbrains.mps.logic">
-      <concept id="238586457668550951" name="jetbrains.mps.logic.structure.LogicalSubstitution" flags="ng" index="22Ky0T">
+      <concept id="238586457668550951" name="jetbrains.mps.logic.structure.Splice" flags="ng" index="22Ky0T">
         <child id="238586457668550958" name="expression" index="22Ky0K" />
       </concept>
-      <concept id="2105510410850132386" name="jetbrains.mps.logic.structure.ListNode" flags="ng" index="KCUsM">
+      <concept id="2105510410850132386" name="jetbrains.mps.logic.structure.List" flags="ng" index="KCUsM">
         <child id="2105510410850136264" name="contents" index="KCVpo" />
       </concept>
       <concept id="7571593955706120730" name="jetbrains.mps.logic.structure.Ast" flags="ng" index="1oi1Uc">
@@ -154,7 +166,7 @@
       <concept id="7571593955706137472" name="jetbrains.mps.logic.structure.ValueRole" flags="ng" index="1oi5Wm">
         <child id="7571593955706137672" name="contents" index="1oi5zu" />
       </concept>
-      <concept id="7571593955706137573" name="jetbrains.mps.logic.structure.ValueHolder" flags="ng" index="1oi5XN">
+      <concept id="7571593955706137573" name="jetbrains.mps.logic.structure.Value" flags="ng" index="1oi5XN">
         <property id="7571593955706137638" name="value" index="1oi5yK" />
       </concept>
     </language>
@@ -3155,5 +3167,789 @@
       </node>
     </node>
   </node>
+  <node concept="3s_ewN" id="3K_0akS$KOB">
+    <property role="3s_ewP" value="UniEqSolverCommute" />
+    <node concept="312cEg" id="3K_0akS$LOh" role="jymVt">
+      <property role="TrG5h" value="constraintSystem" />
+      <node concept="3Tm6S6" id="3K_0akS$LOi" role="1B3o_S" />
+      <node concept="3uibUv" id="3K_0akS$LOj" role="1tU5fm">
+        <ref role="3uigEE" to="eifs:~ConstraintSystem" resolve="ConstraintSystem" />
+      </node>
+    </node>
+    <node concept="312cEg" id="3K_0akS$LOk" role="jymVt">
+      <property role="TrG5h" value="unificationSolver" />
+      <node concept="3Tm6S6" id="3K_0akS$LOl" role="1B3o_S" />
+      <node concept="3uibUv" id="3K_0akS$LOm" role="1tU5fm">
+        <ref role="3uigEE" to="oy3s:6njqcfQVO0n" resolve="UnificationSolver" />
+      </node>
+    </node>
+    <node concept="312cEg" id="3K_0akS$Mx8" role="jymVt">
+      <property role="TrG5h" value="eqSolver" />
+      <node concept="3Tm6S6" id="3K_0akS$Mx6" role="1B3o_S" />
+      <node concept="3uibUv" id="3K_0akS$Mx7" role="1tU5fm">
+        <ref role="3uigEE" to="oy3s:3HJTsBn4ogZ" resolve="EqualsSolverImpl" />
+      </node>
+    </node>
+    <node concept="2tJIrI" id="3K_0akS$LPO" role="jymVt" />
+    <node concept="3clFb_" id="3K_0akS$LQk" role="jymVt">
+      <property role="TrG5h" value="var" />
+      <node concept="37vLTG" id="3K_0akS$LQl" role="3clF46">
+        <property role="TrG5h" value="name" />
+        <node concept="17QB3L" id="3K_0akS$LQm" role="1tU5fm" />
+      </node>
+      <node concept="3uibUv" id="3K_0akS$LQn" role="3clF45">
+        <ref role="3uigEE" to="ie8e:uNmovXiEd4" resolve="Variable" />
+      </node>
+      <node concept="3Tm6S6" id="3K_0akS$LQo" role="1B3o_S" />
+      <node concept="3clFbS" id="3K_0akS$LQp" role="3clF47">
+        <node concept="3clFbF" id="3K_0akS$LQq" role="3cqZAp">
+          <node concept="10QFUN" id="3K_0akS$LQr" role="3clFbG">
+            <node concept="2OqwBi" id="3K_0akS$LQs" role="10QFUP">
+              <node concept="2ShNRf" id="3K_0akS$LQt" role="2Oq$k0">
+                <node concept="1pGfFk" id="3K_0akS$LQu" role="2ShVmc">
+                  <ref role="37wK5l" to="oy3s:6SkxsM$96Z2" resolve="AtomLogical" />
+                  <node concept="37vLTw" id="3K_0akS$LQv" role="37wK5m">
+                    <ref role="3cqZAo" node="3K_0akS$LQl" resolve="name" />
+                  </node>
+                </node>
+              </node>
+              <node concept="liA8E" id="3K_0akS$LQw" role="2OqNvi">
+                <ref role="37wK5l" to="oy3s:1Ns6gpY6DeD" resolve="asAtom" />
+              </node>
+            </node>
+            <node concept="3uibUv" id="3K_0akS$LQx" role="10QFUM">
+              <ref role="3uigEE" to="ie8e:uNmovXiEd4" resolve="Variable" />
+            </node>
+          </node>
+        </node>
+      </node>
+    </node>
+    <node concept="2tJIrI" id="3K_0akS$Nwv" role="jymVt" />
+    <node concept="3clFb_" id="3K_0akS$NEa" role="jymVt">
+      <property role="TrG5h" value="logical" />
+      <node concept="3uibUv" id="3K_0akS$NJg" role="3clF45">
+        <ref role="3uigEE" to="oy3s:4U_yxogAknZ" resolve="AtomLogical" />
+      </node>
+      <node concept="3Tm1VV" id="3K_0akS$NEd" role="1B3o_S" />
+      <node concept="3clFbS" id="3K_0akS$NEe" role="3clF47">
+        <node concept="3clFbF" id="3K_0akS$NJW" role="3cqZAp">
+          <node concept="2ShNRf" id="3K_0akS$NJY" role="3clFbG">
+            <node concept="1pGfFk" id="3K_0akS$NJZ" role="2ShVmc">
+              <ref role="37wK5l" to="oy3s:6SkxsM$96Z2" resolve="AtomLogical" />
+              <node concept="37vLTw" id="3K_0akS$NK0" role="37wK5m">
+                <ref role="3cqZAo" node="3K_0akS$NJK" resolve="name" />
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="37vLTG" id="3K_0akS$NJK" role="3clF46">
+        <property role="TrG5h" value="name" />
+        <node concept="17QB3L" id="3K_0akS$NJJ" role="1tU5fm" />
+      </node>
+    </node>
+    <node concept="3Tm1VV" id="3K_0akS$KOC" role="1B3o_S" />
+    <node concept="3s_gsd" id="3K_0akS$KOD" role="3s_ewO">
+      <node concept="3s$Bmu" id="3K_0akS$LPz" role="3s_gse">
+        <property role="3s$Bm0" value="uni_then_eq" />
+        <node concept="3cqZAl" id="3K_0akS$LP_" role="3clF45" />
+        <node concept="3Tm1VV" id="3K_0akS$LPB" role="1B3o_S" />
+        <node concept="3clFbS" id="3K_0akS$LPC" role="3clF47">
+          <node concept="3clFbH" id="3K_0akS$LPL" role="3cqZAp" />
+          <node concept="3cpWs8" id="3K_0akS$NRq" role="3cqZAp">
+            <node concept="3cpWsn" id="3K_0akS$NRr" role="3cpWs9">
+              <property role="TrG5h" value="x1" />
+              <node concept="3uibUv" id="3K_0akS$NRp" role="1tU5fm">
+                <ref role="3uigEE" to="oy3s:4U_yxogAknZ" resolve="AtomLogical" />
+              </node>
+              <node concept="1rXfSq" id="3K_0akS$NRs" role="33vP2m">
+                <ref role="37wK5l" node="3K_0akS$NEa" resolve="logical" />
+                <node concept="Xl_RD" id="3K_0akS$NRt" role="37wK5m">
+                  <property role="Xl_RC" value="X1" />
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3cpWs8" id="3K_0akS$O10" role="3cqZAp">
+            <node concept="3cpWsn" id="3K_0akS$O11" role="3cpWs9">
+              <property role="TrG5h" value="y1" />
+              <node concept="3uibUv" id="3K_0akS$O0Y" role="1tU5fm">
+                <ref role="3uigEE" to="oy3s:4U_yxogAknZ" resolve="AtomLogical" />
+              </node>
+              <node concept="1rXfSq" id="3K_0akS$O12" role="33vP2m">
+                <ref role="37wK5l" node="3K_0akS$NEa" resolve="logical" />
+                <node concept="Xl_RD" id="3K_0akS$O13" role="37wK5m">
+                  <property role="Xl_RC" value="Y1" />
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbH" id="3K_0akS_e8b" role="3cqZAp" />
+          <node concept="3cpWs8" id="3K_0akS_eya" role="3cqZAp">
+            <node concept="3cpWsn" id="3K_0akS_eyb" role="3cpWs9">
+              <property role="TrG5h" value="bar" />
+              <node concept="3uibUv" id="3K_0akS_ey9" role="1tU5fm">
+                <ref role="3uigEE" to="ie8e:1bm7a6EXvsP" resolve="Atom" />
+              </node>
+              <node concept="1oi1Uc" id="3K_0akS_eyc" role="33vP2m">
+                <node concept="1oi5UN" id="3K_0akS_eyd" role="1oi0x0">
+                  <node concept="1oi5Wm" id="3K_0akS_eye" role="1ojpOf">
+                    <property role="TrG5h" value="name" />
+                    <node concept="1oi5XN" id="3K_0akS_eyf" role="1oi5zu">
+                      <property role="1oi5yK" value="Bar" />
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbF" id="3K_0akS_eOr" role="3cqZAp">
+            <node concept="2OqwBi" id="3K_0akS_eZx" role="3clFbG">
+              <node concept="37vLTw" id="3K_0akS_eOp" role="2Oq$k0">
+                <ref role="3cqZAo" node="3K_0akS$LOk" resolve="unificationSolver" />
+              </node>
+              <node concept="liA8E" id="3K_0akS_faY" role="2OqNvi">
+                <ref role="37wK5l" to="oy3s:4U_yxogCdjW" resolve="tellUni" />
+                <node concept="37vLTw" id="3K_0akS_fco" role="37wK5m">
+                  <ref role="3cqZAo" node="3K_0akS$O11" resolve="y1" />
+                </node>
+                <node concept="37vLTw" id="3K_0akS_ffr" role="37wK5m">
+                  <ref role="3cqZAo" node="3K_0akS_eyb" resolve="bar" />
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbH" id="3K_0akS_fhs" role="3cqZAp" />
+          <node concept="3clFbF" id="3K_0akS$Ni5" role="3cqZAp">
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+              <node concept="3uibUv" id="3K_0akS_pDj" role="1tU5fm">
+                <ref role="3uigEE" to="oy3s:4U_yxogAknZ" resolve="AtomLogical" />
+              </node>
+              <node concept="1rXfSq" id="3K_0akS_pDk" role="33vP2m">
+                <ref role="37wK5l" node="3K_0akS$NEa" resolve="logical" />
+                <node concept="Xl_RD" id="3K_0akS_pDl" role="37wK5m">
+                  <property role="Xl_RC" value="P1" />
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbH" id="3K_0akS_pDm" role="3cqZAp" />
+          <node concept="3cpWs8" id="3K_0akS_pDn" role="3cqZAp">
+            <node concept="3cpWsn" id="3K_0akS_pDo" role="3cpWs9">
+              <property role="TrG5h" value="foo" />
+              <node concept="3uibUv" id="3K_0akS_pDp" role="1tU5fm">
+                <ref role="3uigEE" to="ie8e:1bm7a6EXvsP" resolve="Atom" />
+              </node>
+              <node concept="1oi1Uc" id="3K_0akS_pDq" role="33vP2m">
+                <node concept="1oi5UN" id="3K_0akS_pDr" role="1oi0x0">
+                  <node concept="1oi5Wm" id="3K_0akS_pDs" role="1ojpOf">
+                    <property role="TrG5h" value="name" />
+                    <node concept="1oi5XN" id="3K_0akS_pDt" role="1oi5zu">
+                      <property role="1oi5yK" value="Foo" />
+                    </node>
+                  </node>
+                  <node concept="1oi5ST" id="3K_0akS_pDu" role="1ojpOf">
+                    <property role="TrG5h" value="child" />
+                    <node concept="KCUsM" id="3K_0akS_pDv" role="1oi5TL">
+                      <node concept="1oi5UN" id="3K_0akS_pDw" role="KCVpo">
+                        <node concept="22Ky0T" id="3K_0akS_pDx" role="lGtFl">
+                          <node concept="37vLTw" id="3K_0akS_pDy" role="22Ky0K">
+                            <ref role="3cqZAo" node="3K_0akS_pD5" resolve="w1" />
+                          </node>
+                        </node>
+                      </node>
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbH" id="3K_0akS_pDz" role="3cqZAp" />
+          <node concept="3clFbF" id="3K_0akS_pD$" role="3cqZAp">
+            <node concept="2OqwBi" id="3K_0akS_pD_" role="3clFbG">
+              <node concept="37vLTw" id="3K_0akS_pDA" role="2Oq$k0">
+                <ref role="3cqZAo" node="3K_0akS$LOk" resolve="unificationSolver" />
+              </node>
+              <node concept="liA8E" id="3K_0akS_pDB" role="2OqNvi">
+                <ref role="37wK5l" to="oy3s:4U_yxogCdjW" resolve="tellUni" />
+                <node concept="37vLTw" id="3K_0akS_pDC" role="37wK5m">
+                  <ref role="3cqZAo" node="3K_0akS_pDi" resolve="p1" />
+                </node>
+                <node concept="37vLTw" id="3K_0akS_pDD" role="37wK5m">
+                  <ref role="3cqZAo" node="3K_0akS_pDo" resolve="foo" />
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbH" id="3K_0akS_pDE" role="3cqZAp" />
+          <node concept="3clFbF" id="3K_0akS_pCX" role="3cqZAp">
+            <node concept="2OqwBi" id="3K_0akS_pCY" role="3clFbG">
+              <node concept="37vLTw" id="3K_0akS_pCZ" role="2Oq$k0">
+                <ref role="3cqZAo" node="3K_0akS$LOk" resolve="unificationSolver" />
+              </node>
+              <node concept="liA8E" id="3K_0akS_pD0" role="2OqNvi">
+                <ref role="37wK5l" to="oy3s:4U_yxogCe_U" resolve="tellUni" />
+                <node concept="37vLTw" id="3K_0akS_pD1" role="37wK5m">
+                  <ref role="3cqZAo" node="3K_0akS_pC_" resolve="x1" />
+                </node>
+                <node concept="37vLTw" id="3K_0akS_pD2" role="37wK5m">
+                  <ref role="3cqZAo" node="3K_0akS_pCE" resolve="y1" />
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbH" id="3K_0akS_pD3" role="3cqZAp" />
+          <node concept="3cpWs8" id="6HT7BWBPhwL" role="3cqZAp">
+            <node concept="3cpWsn" id="6HT7BWBPhwM" role="3cpWs9">
+              <property role="TrG5h" value="value" />
+              <node concept="3uibUv" id="6HT7BWBPhwJ" role="1tU5fm">
+                <ref role="3uigEE" to="ie8e:1bm7a6EXvsP" resolve="Atom" />
+              </node>
+              <node concept="2OqwBi" id="6HT7BWBPhwN" role="33vP2m">
+                <node concept="2OqwBi" id="6HT7BWBPhwO" role="2Oq$k0">
+                  <node concept="37vLTw" id="6HT7BWBPhwP" role="2Oq$k0">
+                    <ref role="3cqZAo" node="3K_0akS_pDi" resolve="p1" />
+                  </node>
+                  <node concept="liA8E" id="6HT7BWBPhwQ" role="2OqNvi">
+                    <ref role="37wK5l" to="oy3s:dfChU1gcsX" resolve="findRoot" />
+                  </node>
+                </node>
+                <node concept="liA8E" id="6HT7BWBPhwR" role="2OqNvi">
+                  <ref role="37wK5l" to="oy3s:3HJTsBmBZ0h" resolve="value" />
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbF" id="6HT7BWBPidq" role="3cqZAp">
+            <node concept="37vLTI" id="6HT7BWBPiGd" role="3clFbG">
+              <node concept="2YIFZM" id="6HT7BWBPj3B" role="37vLTx">
+                <ref role="37wK5l" to="ie8e:6HT7BWBOXr$" resolve="ground" />
+                <ref role="1Pybhc" to="ie8e:6HT7BWBOXme" resolve="AtomUtil" />
+                <node concept="37vLTw" id="6HT7BWBPj4j" role="37wK5m">
+                  <ref role="3cqZAo" node="6HT7BWBPhwM" resolve="value" />
+                </node>
+              </node>
+              <node concept="37vLTw" id="6HT7BWBPido" role="37vLTJ">
+                <ref role="3cqZAo" node="6HT7BWBPhwM" resolve="value" />
+              </node>
+            </node>
+          </node>
+          <node concept="3cpWs8" id="3K_0akS_pDN" role="3cqZAp">
+            <node concept="3cpWsn" id="3K_0akS_pDO" role="3cpWs9">
+              <property role="TrG5h" value="it" />
+              <node concept="3uibUv" id="3K_0akS_pDP" role="1tU5fm">
+                <ref role="3uigEE" to="33ny:~Iterator" resolve="Iterator" />
+                <node concept="3qUE_q" id="3K_0akS_pDQ" role="11_B2D">
+                  <node concept="3uibUv" id="3K_0akS_pDR" role="3qUE_r">
+                    <ref role="3uigEE" to="yt73:~Term" resolve="Term" />
+                  </node>
+                </node>
+              </node>
+              <node concept="2OqwBi" id="3K_0akS_pDS" role="33vP2m">
+                <node concept="2OqwBi" id="3K_0akS_pDT" role="2Oq$k0">
+                  <node concept="37vLTw" id="6HT7BWBPhwS" role="2Oq$k0">
+                    <ref role="3cqZAo" node="6HT7BWBPhwM" resolve="value" />
+                  </node>
+                  <node concept="liA8E" id="3K_0akS_pDV" role="2OqNvi">
+                    <ref role="37wK5l" to="yt73:~Term.arguments()" resolve="arguments" />
+                  </node>
+                </node>
+                <node concept="liA8E" id="3K_0akS_pDW" role="2OqNvi">
+                  <ref role="37wK5l" to="33ny:~Collection.iterator():java.util.Iterator" resolve="iterator" />
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbF" id="3K_0akS_pDX" role="3cqZAp">
+            <node concept="2OqwBi" id="3K_0akS_pDY" role="3clFbG">
+              <node concept="37vLTw" id="3K_0akS_pDZ" role="2Oq$k0">
+                <ref role="3cqZAo" node="3K_0akS_pDO" resolve="it" />
+              </node>
+              <node concept="liA8E" id="3K_0akS_pE0" role="2OqNvi">
+                <ref role="37wK5l" to="33ny:~Iterator.next():java.lang.Object" resolve="next" />
+              </node>
+            </node>
+          </node>
+          <node concept="3cpWs8" id="3K_0akS_pE9" role="3cqZAp">
+            <node concept="3cpWsn" id="3K_0akS_pEa" role="3cpWs9">
+              <property role="TrG5h" value="children" />
+              <node concept="3uibUv" id="3K_0akS_pEb" role="1tU5fm">
+                <ref role="3uigEE" to="33ny:~ArrayList" resolve="ArrayList" />
+                <node concept="3uibUv" id="3K_0akS_pEc" role="11_B2D">
+                  <ref role="3uigEE" to="ie8e:1bm7a6EXvsP" resolve="Atom" />
+                </node>
+              </node>
+              <node concept="2ShNRf" id="3K_0akS_pEd" role="33vP2m">
+                <node concept="1pGfFk" id="3K_0akS_pEe" role="2ShVmc">
+                  <ref role="37wK5l" to="33ny:~ArrayList.&lt;init&gt;()" resolve="ArrayList" />
+                  <node concept="3uibUv" id="3K_0akS_pEf" role="1pMfVU">
+                    <ref role="3uigEE" to="ie8e:1bm7a6EXvsP" resolve="Atom" />
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbF" id="3K_0akS_pEg" role="3cqZAp">
+            <node concept="2OqwBi" id="3K_0akS_pEh" role="3clFbG">
+              <node concept="1eOMI4" id="3K_0akS_$2P" role="2Oq$k0">
+                <node concept="10QFUN" id="3K_0akS_$2Q" role="1eOMHV">
+                  <node concept="3uibUv" id="3K_0akS_$2R" role="10QFUM">
+                    <ref role="3uigEE" to="ie8e:3OPtF03lco4" resolve="ListFunc" />
+                  </node>
+                  <node concept="2OqwBi" id="3K_0akS_$2S" role="10QFUP">
+                    <node concept="37vLTw" id="3K_0akS_$2T" role="2Oq$k0">
+                      <ref role="3cqZAo" node="3K_0akS_pDO" resolve="it" />
+                    </node>
+                    <node concept="liA8E" id="3K_0akS_$2U" role="2OqNvi">
+                      <ref role="37wK5l" to="33ny:~Iterator.next():java.lang.Object" resolve="next" />
+                    </node>
+                  </node>
+                </node>
+              </node>
+              <node concept="liA8E" id="3K_0akS_pEj" role="2OqNvi">
+                <ref role="37wK5l" to="ie8e:3OPtF03lcua" resolve="toList" />
+                <node concept="37vLTw" id="3K_0akS_pEk" role="37wK5m">
+                  <ref role="3cqZAo" node="3K_0akS_pEa" resolve="children" />
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3vlDli" id="3K_0akS_pEl" role="3cqZAp">
+            <node concept="2OqwBi" id="6HT7BWBRDyo" role="3tpDZB">
+              <node concept="2OqwBi" id="3K_0akS_Gat" role="2Oq$k0">
+                <node concept="37vLTw" id="3K_0akS_Gau" role="2Oq$k0">
+                  <ref role="3cqZAo" node="3K_0akS_pEa" resolve="children" />
+                </node>
+                <node concept="liA8E" id="3K_0akS_Gav" role="2OqNvi">
+                  <ref role="37wK5l" to="33ny:~ArrayList.get(int):java.lang.Object" resolve="get" />
+                  <node concept="3cmrfG" id="3K_0akS_Gaw" role="37wK5m">
+                    <property role="3cmrfH" value="0" />
+                  </node>
+                </node>
+              </node>
+              <node concept="liA8E" id="6HT7BWBRDWu" role="2OqNvi">
+                <ref role="37wK5l" to="ie8e:2QE4RCGndD7" resolve="asRoot" />
+              </node>
+            </node>
+            <node concept="37vLTw" id="3K_0akS_pEq" role="3tpDZA">
+              <ref role="3cqZAo" node="3K_0akS_pCK" resolve="bar" />
+            </node>
+          </node>
+          <node concept="3clFbH" id="3K_0akS_pEr" role="3cqZAp" />
+        </node>
+      </node>
+    </node>
+    <node concept="1KhYhu" id="3K_0akS$LUq" role="1KhZu4">
+      <node concept="3clFbS" id="3K_0akS$LUr" role="2VODD2">
+        <node concept="3clFbF" id="3K_0akS$LUs" role="3cqZAp">
+          <node concept="37vLTI" id="3K_0akS$LUt" role="3clFbG">
+            <node concept="37vLTw" id="3K_0akS$LUu" role="37vLTJ">
+              <ref role="3cqZAo" node="3K_0akS$LOh" resolve="constraintSystem" />
+            </node>
+            <node concept="2ShNRf" id="3K_0akS$LUv" role="37vLTx">
+              <node concept="1pGfFk" id="3K_0akS$LUw" role="2ShVmc">
+                <ref role="37wK5l" to="eifs:~ConstraintSystem.&lt;init&gt;()" resolve="ConstraintSystem" />
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="3clFbF" id="3K_0akS$LUx" role="3cqZAp">
+          <node concept="2OqwBi" id="3K_0akS$LUy" role="3clFbG">
+            <node concept="37vLTw" id="3K_0akS$LUz" role="2Oq$k0">
+              <ref role="3cqZAo" node="3K_0akS$LOh" resolve="constraintSystem" />
+            </node>
+            <node concept="liA8E" id="3K_0akS$LU$" role="2OqNvi">
+              <ref role="37wK5l" to="eifs:~ConstraintSystem.setQueuing(boolean):void" resolve="setQueuing" />
+              <node concept="3clFbT" id="3K_0akS$LU_" role="37wK5m">
+                <property role="3clFbU" value="false" />
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="3clFbF" id="3K_0akS$LUA" role="3cqZAp">
+          <node concept="37vLTI" id="3K_0akS$LUB" role="3clFbG">
+            <node concept="2ShNRf" id="3K_0akS$LUC" role="37vLTx">
+              <node concept="1pGfFk" id="3K_0akS$LUD" role="2ShVmc">
+                <ref role="37wK5l" to="oy3s:4U_yxogDEZX" resolve="UnificationSolverImpl" />
+                <node concept="37vLTw" id="3K_0akS$LUE" role="37wK5m">
+                  <ref role="3cqZAo" node="3K_0akS$LOh" resolve="constraintSystem" />
+                </node>
+              </node>
+            </node>
+            <node concept="37vLTw" id="3K_0akS$LUF" role="37vLTJ">
+              <ref role="3cqZAo" node="3K_0akS$LOk" resolve="unificationSolver" />
+            </node>
+          </node>
+        </node>
+        <node concept="3clFbF" id="3K_0akS$Mxh" role="3cqZAp">
+          <node concept="37vLTI" id="3K_0akS$Mxi" role="3clFbG">
+            <node concept="2ShNRf" id="3K_0akS$Mxm" role="37vLTx">
+              <node concept="1pGfFk" id="3K_0akS$Mxn" role="2ShVmc">
+                <ref role="37wK5l" to="oy3s:3HJTsBn5jeB" resolve="EqualsSolverImpl" />
+                <node concept="37vLTw" id="3K_0akS$Mxo" role="37wK5m">
+                  <ref role="3cqZAo" node="3K_0akS$LOh" resolve="constraintSystem" />
+                </node>
+              </node>
+            </node>
+            <node concept="37vLTw" id="3K_0akS$MRU" role="37vLTJ">
+              <ref role="3cqZAo" node="3K_0akS$Mx8" resolve="eqSolver" />
+            </node>
+          </node>
+        </node>
+      </node>
+    </node>
+  </node>
 </model>