From d74ec1d2f8ad8b830833e86ec75d2338389a50d7 Mon Sep 17 00:00:00 2001
From: Fedor Isakov <fisakov@gmail.com>
Date: Thu, 27 Dec 2018 12:03:07 +0100
Subject: [PATCH] Introduce support for unification variables of arbitrary
 type, not just terms. Minor refactoring and cleanup.

---
 .../generator/template/main@generator.mps     |  183 +-
 .../models/jetbrains.mps.logic.dataform.mps   |  417 +---
 .../models/jetbrains.mps.logic.predicate.mps  | 2130 +++++++++++++----
 .../models/jetbrains.mps.logic.program.mps    |  420 +---
 .../jetbrains.mps.logic.unification.mps       | 1779 ++++++++++++--
 .../models/plugin.mps                         |   17 +-
 .../jetbrains/mps/logic/test/unification.mps  |   20 -
 .../mps/logic/test/unification@tests.mps      | 1249 ++++++++--
 .../jetbrains.mps.typechecking@tests.mps      |   15 +-
 9 files changed, 4493 insertions(+), 1737 deletions(-)

diff --git a/coderules/languages/jetbrains.mps.logic/generator/template/main@generator.mps b/coderules/languages/jetbrains.mps.logic/generator/template/main@generator.mps
index 26dcf494..f9be4481 100644
--- a/coderules/languages/jetbrains.mps.logic/generator/template/main@generator.mps
+++ b/coderules/languages/jetbrains.mps.logic/generator/template/main@generator.mps
@@ -25,6 +25,7 @@
     <import index="psr6" ref="r:ce187d46-c94b-47d6-8d77-26aa6af239e8(jetbrains.mps.lang.coderules.macro)" />
     <import index="6pyv" ref="r:e418ad23-36dc-4ed0-b837-26a7fd157da3(jetbrains.mps.lang.coderules.program)" />
     <import index="7n8k" ref="r:475a2e92-d7d4-41c3-98e3-172d70b6f018(jetbrains.mps.logic.program)" />
+    <import index="oy3s" ref="r:a6030cee-34eb-4503-b1bf-015fe5cd8c1a(jetbrains.mps.logic.unification)" />
   </imports>
   <registry>
     <language id="f3061a53-9226-4cc5-a443-f952ceaf5816" name="jetbrains.mps.baseLanguage">
@@ -607,9 +608,9 @@
             </node>
           </node>
           <node concept="gft3U" id="4OKkcneWb1C" role="150oIE">
-            <node concept="2YIFZM" id="74q$MmRB2bg" role="gfFT$">
-              <ref role="37wK5l" to="7n8k:7HUwyZb7chj" resolve="asVariable" />
-              <ref role="1Pybhc" to="7n8k:677NV565N1x" resolve="LogicalUtil" />
+            <node concept="2YIFZM" id="3gNap3fNlJg" role="gfFT$">
+              <ref role="37wK5l" to="oy3s:7HUwyZb7chj" resolve="asVariable" />
+              <ref role="1Pybhc" to="oy3s:677NV565N1x" resolve="LogicalUtil" />
               <node concept="2ShNRf" id="7nPD14NOHH4" role="37wK5m">
                 <node concept="1pGfFk" id="7nPD14NOHH5" role="2ShVmc">
                   <ref role="37wK5l" to="bj13:~MetaLogical.&lt;init&gt;(java.lang.Class)" resolve="MetaLogical" />
@@ -622,9 +623,9 @@
           </node>
         </node>
         <node concept="gft3U" id="4OKkcneWczK" role="14YRTM">
-          <node concept="2YIFZM" id="74q$MmRB2bf" role="gfFT$">
-            <ref role="37wK5l" to="7n8k:7HUwyZb7chj" resolve="asVariable" />
-            <ref role="1Pybhc" to="7n8k:677NV565N1x" resolve="LogicalUtil" />
+          <node concept="2YIFZM" id="3gNap3fNlJh" role="gfFT$">
+            <ref role="37wK5l" to="oy3s:7HUwyZb7chj" resolve="asVariable" />
+            <ref role="1Pybhc" to="oy3s:677NV565N1x" resolve="LogicalUtil" />
             <node concept="2ShNRf" id="2Dg5bSg3RdY" role="37wK5m">
               <node concept="1pGfFk" id="2Dg5bSg3RdZ" role="2ShVmc">
                 <ref role="37wK5l" to="bj13:~MetaLogical.&lt;init&gt;(java.lang.Class)" resolve="MetaLogical" />
@@ -1361,9 +1362,9 @@
             </node>
           </node>
           <node concept="3clFbF" id="677NV56tBWA" role="3cqZAp">
-            <node concept="2YIFZM" id="74q$MmRB2bd" role="3clFbG">
-              <ref role="37wK5l" to="7n8k:7HUwyZb7b7C" resolve="asVariableArray" />
-              <ref role="1Pybhc" to="7n8k:677NV565N1x" resolve="LogicalUtil" />
+            <node concept="2YIFZM" id="3gNap3fNlJf" role="3clFbG">
+              <ref role="37wK5l" to="oy3s:7HUwyZb7b7C" resolve="asVariableArray" />
+              <ref role="1Pybhc" to="oy3s:677NV565N1x" resolve="LogicalUtil" />
               <node concept="37vLTw" id="7HUwyZb7bts" role="37wK5m">
                 <ref role="3cqZAo" node="677NV56tBWz" resolve="mlp" />
                 <node concept="29HgVG" id="7HUwyZb7btt" role="lGtFl">
@@ -1376,7 +1377,7 @@
                   </node>
                 </node>
               </node>
-              <node concept="raruj" id="74q$MmSc8cm" role="lGtFl" />
+              <node concept="raruj" id="3gNap3fRbTn" role="lGtFl" />
             </node>
           </node>
         </node>
@@ -1412,29 +1413,6 @@
     <node concept="3aamgX" id="677NV56thjs" role="3aUrZf">
       <property role="36QftV" value="true" />
       <ref role="30HIoZ" to="tpee:fz3vP1J" resolve="Expression" />
-      <node concept="1Koe21" id="677NV56tAlj" role="1lVwrX">
-        <node concept="3clFbS" id="677NV56tAlk" role="1Koe22">
-          <node concept="3cpWs8" id="677NV56tAll" role="3cqZAp">
-            <node concept="3cpWsn" id="677NV56tAlm" role="3cpWs9">
-              <property role="TrG5h" value="logical" />
-              <node concept="3uibUv" id="7HUwyZb7bYW" role="1tU5fm">
-                <ref role="3uigEE" to="bj13:~MetaLogical" resolve="MetaLogical" />
-              </node>
-            </node>
-          </node>
-          <node concept="3clFbF" id="7HUwyZb7cpf" role="3cqZAp">
-            <node concept="2YIFZM" id="74q$MmRB2bi" role="3clFbG">
-              <ref role="37wK5l" to="7n8k:7HUwyZb7chj" resolve="asVariable" />
-              <ref role="1Pybhc" to="7n8k:677NV565N1x" resolve="LogicalUtil" />
-              <node concept="37vLTw" id="7HUwyZb7cvj" role="37wK5m">
-                <ref role="3cqZAo" node="677NV56tAlm" resolve="logical" />
-                <node concept="29HgVG" id="7HUwyZb7cBP" role="lGtFl" />
-              </node>
-              <node concept="raruj" id="74q$MmSc8gy" role="lGtFl" />
-            </node>
-          </node>
-        </node>
-      </node>
       <node concept="30G5F_" id="2S_ORi36mJS" role="30HLyM">
         <node concept="3clFbS" id="2S_ORi36mJT" role="2VODD2">
           <node concept="3clFbF" id="2S_ORi36mS8" role="3cqZAp">
@@ -1462,6 +1440,72 @@
           </node>
         </node>
       </node>
+      <node concept="14YyZ8" id="3gNap3g_4_D" role="1lVwrX">
+        <node concept="1Koe21" id="677NV56tAlj" role="14YRTM">
+          <node concept="3clFbS" id="677NV56tAlk" role="1Koe22">
+            <node concept="3cpWs8" id="677NV56tAll" role="3cqZAp">
+              <node concept="3cpWsn" id="677NV56tAlm" role="3cpWs9">
+                <property role="TrG5h" value="logical" />
+                <node concept="3uibUv" id="7HUwyZb7bYW" role="1tU5fm">
+                  <ref role="3uigEE" to="bj13:~MetaLogical" resolve="MetaLogical" />
+                </node>
+              </node>
+            </node>
+            <node concept="3clFbF" id="7HUwyZb7cpf" role="3cqZAp">
+              <node concept="2YIFZM" id="3gNap3fNlJi" role="3clFbG">
+                <ref role="1Pybhc" to="oy3s:677NV565N1x" resolve="LogicalUtil" />
+                <ref role="37wK5l" to="oy3s:7HUwyZb7chj" resolve="asVariable" />
+                <node concept="37vLTw" id="7HUwyZb7cvj" role="37wK5m">
+                  <ref role="3cqZAo" node="677NV56tAlm" resolve="logical" />
+                  <node concept="29HgVG" id="7HUwyZb7cBP" role="lGtFl" />
+                </node>
+                <node concept="raruj" id="3gNap3fRccd" role="lGtFl" />
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="14ZrTv" id="3gNap3g_4Ee" role="14ZwWg">
+          <node concept="30G5F_" id="3gNap3g_4Ef" role="150hEN">
+            <node concept="3clFbS" id="3gNap3g_4Eg" role="2VODD2">
+              <node concept="3clFbF" id="3gNap3g_4N5" role="3cqZAp">
+                <node concept="2OqwBi" id="3gNap3g_59X" role="3clFbG">
+                  <node concept="v3LJS" id="3gNap3g_4N4" role="2Oq$k0">
+                    <ref role="v3LJV" node="7FFmDVALe4e" resolve="dataForm" />
+                  </node>
+                  <node concept="1mIQ4w" id="3gNap3g_5B7" role="2OqNvi">
+                    <node concept="chp4Y" id="3gNap3g_6IL" role="cj9EA">
+                      <ref role="cht4Q" to="5j4j:6$jH9oLmYJ_" resolve="Value" />
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="1Koe21" id="3gNap3g_4Ep" role="150oIE">
+            <node concept="3clFbS" id="3gNap3g_4Eq" role="1Koe22">
+              <node concept="3cpWs8" id="3gNap3g_4Er" role="3cqZAp">
+                <node concept="3cpWsn" id="3gNap3g_4Es" role="3cpWs9">
+                  <property role="TrG5h" value="logical" />
+                  <node concept="3uibUv" id="3gNap3g_4Et" role="1tU5fm">
+                    <ref role="3uigEE" to="bj13:~MetaLogical" resolve="MetaLogical" />
+                  </node>
+                </node>
+              </node>
+              <node concept="3clFbF" id="3gNap3g_4Eu" role="3cqZAp">
+                <node concept="2YIFZM" id="3gNap3g_6TT" role="3clFbG">
+                  <ref role="37wK5l" to="oy3s:3gNap3gwG50" resolve="asValue" />
+                  <ref role="1Pybhc" to="oy3s:677NV565N1x" resolve="LogicalUtil" />
+                  <node concept="37vLTw" id="3gNap3g_6TU" role="37wK5m">
+                    <ref role="3cqZAo" node="3gNap3g_4Es" resolve="logical" />
+                    <node concept="29HgVG" id="3gNap3g_6TV" role="lGtFl" />
+                  </node>
+                  <node concept="raruj" id="3gNap3g_6TW" role="lGtFl" />
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
     </node>
     <node concept="3aamgX" id="514BAS_YArp" role="3aUrZf">
       <property role="36QftV" value="true" />
@@ -1493,25 +1537,68 @@
           </node>
         </node>
       </node>
-      <node concept="1Koe21" id="514BAS_YBDs" role="1lVwrX">
-        <node concept="3clFbS" id="514BAS_YBDt" role="1Koe22">
-          <node concept="3cpWs8" id="514BAS_YBDu" role="3cqZAp">
-            <node concept="3cpWsn" id="514BAS_YBDv" role="3cpWs9">
-              <property role="TrG5h" value="logical" />
-              <node concept="3uibUv" id="3mz2_dYuqQi" role="1tU5fm">
-                <ref role="3uigEE" to="bj13:~Logical" resolve="Logical" />
+      <node concept="14YyZ8" id="3gNap3g_6U4" role="1lVwrX">
+        <node concept="1Koe21" id="514BAS_YBDs" role="14YRTM">
+          <node concept="3clFbS" id="514BAS_YBDt" role="1Koe22">
+            <node concept="3cpWs8" id="514BAS_YBDu" role="3cqZAp">
+              <node concept="3cpWsn" id="514BAS_YBDv" role="3cpWs9">
+                <property role="TrG5h" value="logical" />
+                <node concept="3uibUv" id="3mz2_dYuqQi" role="1tU5fm">
+                  <ref role="3uigEE" to="bj13:~Logical" resolve="Logical" />
+                </node>
+              </node>
+            </node>
+            <node concept="3clFbF" id="514BAS_YBDx" role="3cqZAp">
+              <node concept="2YIFZM" id="3gNap3fNlJk" role="3clFbG">
+                <ref role="1Pybhc" to="oy3s:677NV565N1x" resolve="LogicalUtil" />
+                <ref role="37wK5l" to="oy3s:4TCblo5YI1H" resolve="asVariable" />
+                <node concept="37vLTw" id="514BAS_YBDz" role="37wK5m">
+                  <ref role="3cqZAo" node="514BAS_YBDv" resolve="logical" />
+                  <node concept="29HgVG" id="514BAS_YBD$" role="lGtFl" />
+                </node>
+                <node concept="raruj" id="3gNap3fRcv3" role="lGtFl" />
               </node>
             </node>
           </node>
-          <node concept="3clFbF" id="514BAS_YBDx" role="3cqZAp">
-            <node concept="2YIFZM" id="74q$MmRB2bm" role="3clFbG">
-              <ref role="37wK5l" to="7n8k:4TCblo5YI1H" resolve="asVariable" />
-              <ref role="1Pybhc" to="7n8k:677NV565N1x" resolve="LogicalUtil" />
-              <node concept="37vLTw" id="514BAS_YBDz" role="37wK5m">
-                <ref role="3cqZAo" node="514BAS_YBDv" resolve="logical" />
-                <node concept="29HgVG" id="514BAS_YBD$" role="lGtFl" />
+        </node>
+        <node concept="14ZrTv" id="3gNap3g_6ZZ" role="14ZwWg">
+          <node concept="30G5F_" id="3gNap3g_700" role="150hEN">
+            <node concept="3clFbS" id="3gNap3g_701" role="2VODD2">
+              <node concept="3clFbF" id="3gNap3g_70v" role="3cqZAp">
+                <node concept="2OqwBi" id="3gNap3g_7h_" role="3clFbG">
+                  <node concept="v3LJS" id="3gNap3g_70u" role="2Oq$k0">
+                    <ref role="v3LJV" node="7FFmDVALe4e" resolve="dataForm" />
+                  </node>
+                  <node concept="1mIQ4w" id="3gNap3g_7Jc" role="2OqNvi">
+                    <node concept="chp4Y" id="3gNap3g_7Jk" role="cj9EA">
+                      <ref role="cht4Q" to="5j4j:6$jH9oLmYJ_" resolve="Value" />
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="1Koe21" id="3gNap3g_70a" role="150oIE">
+            <node concept="3clFbS" id="3gNap3g_70b" role="1Koe22">
+              <node concept="3cpWs8" id="3gNap3g_70c" role="3cqZAp">
+                <node concept="3cpWsn" id="3gNap3g_70d" role="3cpWs9">
+                  <property role="TrG5h" value="logical" />
+                  <node concept="3uibUv" id="3gNap3g_7Jq" role="1tU5fm">
+                    <ref role="3uigEE" to="bj13:~MetaLogical" resolve="MetaLogical" />
+                  </node>
+                </node>
+              </node>
+              <node concept="3clFbF" id="3gNap3g_70f" role="3cqZAp">
+                <node concept="2YIFZM" id="3gNap3g_bV_" role="3clFbG">
+                  <ref role="37wK5l" to="oy3s:3gNap3fZcVn" resolve="asValue" />
+                  <ref role="1Pybhc" to="oy3s:677NV565N1x" resolve="LogicalUtil" />
+                  <node concept="37vLTw" id="3gNap3g_bVA" role="37wK5m">
+                    <ref role="3cqZAo" node="3gNap3g_70d" resolve="logical" />
+                    <node concept="29HgVG" id="3gNap3g_bVB" role="lGtFl" />
+                  </node>
+                  <node concept="raruj" id="3gNap3g_bVC" role="lGtFl" />
+                </node>
               </node>
-              <node concept="raruj" id="74q$MmSc8gQ" role="lGtFl" />
             </node>
           </node>
         </node>
diff --git a/coderules/languages/jetbrains.mps.logic/runtime/models/jetbrains.mps.logic.dataform.mps b/coderules/languages/jetbrains.mps.logic/runtime/models/jetbrains.mps.logic.dataform.mps
index ae5193df..acf66adb 100644
--- a/coderules/languages/jetbrains.mps.logic/runtime/models/jetbrains.mps.logic.dataform.mps
+++ b/coderules/languages/jetbrains.mps.logic/runtime/models/jetbrains.mps.logic.dataform.mps
@@ -12,6 +12,7 @@
     <import index="wyt6" ref="6354ebe7-c22a-4a0f-ac54-50b52ab9b065/java:java.lang(JDK/)" />
     <import index="ni5j" ref="6354ebe7-c22a-4a0f-ac54-50b52ab9b065/java:java.util.regex(JDK/)" />
     <import index="bj13" ref="bbf5c548-7111-4a53-a117-cdefc664cf34/java:jetbrains.mps.logic.reactor.logical(jetbrains.mps.logic.reactor/)" />
+    <import index="oy3s" ref="r:a6030cee-34eb-4503-b1bf-015fe5cd8c1a(jetbrains.mps.logic.unification)" />
   </imports>
   <registry>
     <language id="f3061a53-9226-4cc5-a443-f952ceaf5816" name="jetbrains.mps.baseLanguage">
@@ -658,9 +659,32 @@
       <node concept="10Oyi0" id="5BGv8yzwRq6" role="3clF45" />
       <node concept="3Tm1VV" id="5BGv8yzwRq7" role="1B3o_S" />
       <node concept="3clFbS" id="5BGv8yzwRq9" role="3clF47">
-        <node concept="3clFbF" id="5BGv8yzwSdi" role="3cqZAp">
-          <node concept="3cmrfG" id="5BGv8yzwSdh" role="3clFbG">
-            <property role="3cmrfH" value="0" />
+        <node concept="3clFbF" id="1sIKvV30WPY" role="3cqZAp">
+          <node concept="3K4zz7" id="1sIKvV3118i" role="3clFbG">
+            <node concept="3cmrfG" id="1sIKvV3119i" role="3K4E3e">
+              <property role="3cmrfH" value="1" />
+            </node>
+            <node concept="3cmrfG" id="1sIKvV3119Z" role="3K4GZi">
+              <property role="3cmrfH" value="0" />
+            </node>
+            <node concept="22lmx$" id="1sIKvV30Xfx" role="3K4Cdx">
+              <node concept="2ZW3vV" id="1sIKvV30Xwa" role="3uHU7w">
+                <node concept="3uibUv" id="1sIKvV310X6" role="2ZW6by">
+                  <ref role="3uigEE" to="bj13:~MetaLogical" resolve="MetaLogical" />
+                </node>
+                <node concept="37vLTw" id="1sIKvV30Xh2" role="2ZW6bz">
+                  <ref role="3cqZAo" node="1msb0mq8QXA" resolve="symbol" />
+                </node>
+              </node>
+              <node concept="2ZW3vV" id="1sIKvV30WXt" role="3uHU7B">
+                <node concept="3uibUv" id="1sIKvV30WXI" role="2ZW6by">
+                  <ref role="3uigEE" to="bj13:~Logical" resolve="Logical" />
+                </node>
+                <node concept="37vLTw" id="1sIKvV30WPX" role="2ZW6bz">
+                  <ref role="3cqZAo" node="1msb0mq8QXA" resolve="symbol" />
+                </node>
+              </node>
+            </node>
           </node>
         </node>
       </node>
@@ -3151,143 +3175,35 @@
   </node>
   <node concept="312cEu" id="uNmovXiEd4">
     <property role="TrG5h" value="Variable" />
+    <property role="1sVAO0" value="true" />
     <node concept="3Tm1VV" id="uNmovXiEd5" role="1B3o_S" />
     <node concept="3uibUv" id="1bm7a6F1kuO" role="EKbjA">
       <ref role="3uigEE" node="1bm7a6EXvsP" resolve="DataForm" />
     </node>
     <node concept="2tJIrI" id="uNmovXiELu" role="jymVt" />
-    <node concept="2YIFZL" id="uNmovXiPrH" role="jymVt">
-      <property role="TrG5h" value="create" />
-      <property role="od$2w" value="false" />
-      <property role="DiZV1" value="false" />
-      <node concept="3clFbS" id="uNmovXiPrK" role="3clF47">
-        <node concept="3clFbF" id="uNmovXiPUf" role="3cqZAp">
-          <node concept="2ShNRf" id="uNmovXiPUd" role="3clFbG">
-            <node concept="1pGfFk" id="uNmovXiQaD" role="2ShVmc">
-              <ref role="37wK5l" node="uNmovXiEVu" resolve="Variable" />
-              <node concept="37vLTw" id="uNmovXiQit" role="37wK5m">
-                <ref role="3cqZAo" node="uNmovXiPT0" resolve="name" />
-              </node>
-            </node>
-          </node>
-        </node>
-      </node>
-      <node concept="3Tm1VV" id="uNmovXiQrW" role="1B3o_S" />
-      <node concept="3uibUv" id="uNmovXiP5a" role="3clF45">
-        <ref role="3uigEE" node="uNmovXiEd4" resolve="Variable" />
-      </node>
-      <node concept="37vLTG" id="uNmovXiPT0" role="3clF46">
-        <property role="TrG5h" value="name" />
-        <node concept="17QB3L" id="6SkxsMz$UXc" role="1tU5fm" />
-      </node>
-      <node concept="2AHcQZ" id="1EFtv_BGqym" role="2AJF6D">
-        <ref role="2AI5Lk" to="wyt6:~Deprecated" resolve="Deprecated" />
-      </node>
-    </node>
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@@ -3295,13 +3211,7 @@
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@@ -3310,8 +3220,8 @@
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+              <node concept="VXe08" id="3gNap3ffQrC" role="92FcQ">
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@@ -3349,57 +3259,6 @@
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@@ -3468,7 +3327,7 @@
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@@ -3605,183 +3464,10 @@
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-              </node>
-              <node concept="37vLTw" id="uNmovXjIc8" role="3uHU7w">
-                <ref role="3cqZAo" node="uNmovXiF5Z" resolve="symbol" />
-              </node>
-            </node>
-          </node>
-        </node>
-      </node>
-      <node concept="2AHcQZ" id="uNmovXjH0W" role="2AJF6D">
-        <ref role="2AI5Lk" to="wyt6:~Override" resolve="Override" />
-      </node>
-    </node>
-    <node concept="2tJIrI" id="uNmovXjHy8" role="jymVt" />
-    <node concept="312cEg" id="uNmovXiF5Z" role="jymVt">
-      <property role="TrG5h" value="symbol" />
-      <node concept="3Tmbuc" id="104EUzFKnvc" role="1B3o_S" />
-      <node concept="3uibUv" id="4sSe4$pta0H" role="1tU5fm">
-        <ref role="3uigEE" to="wyt6:~Object" resolve="Object" />
-      </node>
-    </node>
     <node concept="3UR2Jj" id="1EFtv_BGqzg" role="lGtFl">
       <node concept="TZ5HA" id="1EFtv_BGqzh" role="TZ5H$">
         <node concept="1dT_AC" id="1EFtv_BGqzi" role="1dT_Ay">
-          <property role="1dT_AB" value="FIXME should be abstract class" />
+          <property role="1dT_AB" value="Represents a data form that corresponds to a unification variable." />
         </node>
       </node>
     </node>
@@ -4316,6 +4002,13 @@
       <node concept="10Oyi0" id="5BGv8yzvA3a" role="3clF45" />
       <node concept="3Tm1VV" id="5BGv8yzvvJ2" role="1B3o_S" />
       <node concept="3clFbS" id="5BGv8yzvvJ3" role="3clF47" />
+      <node concept="P$JXv" id="1sIKvV30Txg" role="lGtFl">
+        <node concept="TZ5HA" id="1sIKvV30Txh" role="TZ5H$">
+          <node concept="1dT_AC" id="1sIKvV30Txi" role="1dT_Ay">
+            <property role="1dT_AB" value="The number of logical (unification) variables contained by this node." />
+          </node>
+        </node>
+      </node>
     </node>
     <node concept="2tJIrI" id="104EUzFOEMO" role="jymVt" />
     <node concept="3HP615" id="3OPtF02TdNT" role="jymVt">
@@ -8932,6 +8625,11 @@
               </node>
             </node>
           </node>
+          <node concept="3SKdUt" id="3gNap3frO6t" role="3cqZAp">
+            <node concept="3SKdUq" id="3gNap3frO6v" role="3SKWNk">
+              <property role="3SKdUp" value="FIXME there should be a clear contract for instances of TreeForm that wrap logicals" />
+            </node>
+          </node>
           <node concept="3clFbJ" id="7XRk2O3vLOD" role="3cqZAp">
             <node concept="3clFbS" id="7XRk2O3vLOF" role="3clFbx">
               <node concept="3cpWs8" id="7XRk2O3vPN2" role="3cqZAp">
@@ -8953,8 +8651,11 @@
                     <node concept="2OqwBi" id="7XRk2O3vR3X" role="10QFUP">
                       <node concept="1eOMI4" id="7XRk2O3vR3Y" role="2Oq$k0">
                         <node concept="10QFUN" id="7XRk2O3vR3Z" role="1eOMHV">
-                          <node concept="3uibUv" id="7XRk2O3vR40" role="10QFUM">
-                            <ref role="3uigEE" to="bj13:~LogicalOwner" resolve="LogicalOwner" />
+                          <node concept="3uibUv" id="3gNap3fMVVJ" role="10QFUM">
+                            <ref role="3uigEE" to="oy3s:4TCblo5MJ1m" resolve="LogicalDataForm" />
+                            <node concept="3uibUv" id="3gNap3fMVVP" role="11_B2D">
+                              <ref role="3uigEE" node="3OPtF03lco4" resolve="ListNode" />
+                            </node>
                           </node>
                           <node concept="37vLTw" id="7XRk2O3vR41" role="10QFUP">
                             <ref role="3cqZAo" node="7XRk2O3vPGf" resolve="v" />
@@ -8962,7 +8663,7 @@
                         </node>
                       </node>
                       <node concept="liA8E" id="7XRk2O3vR42" role="2OqNvi">
-                        <ref role="37wK5l" to="bj13:~LogicalOwner.logical():jetbrains.mps.logic.reactor.logical.Logical" resolve="logical" />
+                        <ref role="37wK5l" to="oy3s:4TCblo5MS1o" resolve="logical" />
                       </node>
                     </node>
                   </node>
@@ -9002,8 +8703,8 @@
               </node>
             </node>
             <node concept="2ZW3vV" id="7XRk2O3vMfH" role="3clFbw">
-              <node concept="3uibUv" id="7XRk2O3vPCm" role="2ZW6by">
-                <ref role="3uigEE" to="bj13:~LogicalOwner" resolve="LogicalOwner" />
+              <node concept="3uibUv" id="3gNap3fMVVG" role="2ZW6by">
+                <ref role="3uigEE" to="oy3s:4TCblo5MJ1m" resolve="LogicalDataForm" />
               </node>
               <node concept="37vLTw" id="7XRk2O3vPGh" role="2ZW6bz">
                 <ref role="3cqZAo" node="7XRk2O3vPGf" resolve="v" />
@@ -11328,7 +11029,7 @@
                           </node>
                         </node>
                         <node concept="liA8E" id="4sSe4$pxm8F" role="2OqNvi">
-                          <ref role="37wK5l" node="56MMu0Ark7C" resolve="is" />
+                          <ref role="37wK5l" to="yt73:~Term.is(jetbrains.mps.unification.Term$Kind):boolean" resolve="is" />
                           <node concept="Rm8GO" id="4sSe4$pxm8G" role="37wK5m">
                             <ref role="1Px2BO" to="yt73:~Term$Kind" resolve="Term.Kind" />
                             <ref role="Rm8GQ" to="yt73:~Term$Kind.REF" resolve="REF" />
diff --git a/coderules/languages/jetbrains.mps.logic/runtime/models/jetbrains.mps.logic.predicate.mps b/coderules/languages/jetbrains.mps.logic/runtime/models/jetbrains.mps.logic.predicate.mps
index a05cc81e..ed5e009e 100644
--- a/coderules/languages/jetbrains.mps.logic/runtime/models/jetbrains.mps.logic.predicate.mps
+++ b/coderules/languages/jetbrains.mps.logic/runtime/models/jetbrains.mps.logic.predicate.mps
@@ -15,6 +15,7 @@
     <import index="bj13" ref="bbf5c548-7111-4a53-a117-cdefc664cf34/java:jetbrains.mps.logic.reactor.logical(jetbrains.mps.logic.reactor/)" />
     <import index="oy3s" ref="r:a6030cee-34eb-4503-b1bf-015fe5cd8c1a(jetbrains.mps.logic.unification)" />
     <import index="yt73" ref="bbf5c548-7111-4a53-a117-cdefc664cf34/java:jetbrains.mps.unification(jetbrains.mps.logic.reactor/)" />
+    <import index="6exd" ref="r:0f9b1fb3-00f9-4480-b235-1a906a087ab2(jetbrains.mps.logic.dataform)" />
   </imports>
   <registry>
     <language id="f3061a53-9226-4cc5-a443-f952ceaf5816" name="jetbrains.mps.baseLanguage">
@@ -120,6 +121,7 @@
       <concept id="1068498886292" name="jetbrains.mps.baseLanguage.structure.ParameterDeclaration" flags="ir" index="37vLTG" />
       <concept id="1068498886294" name="jetbrains.mps.baseLanguage.structure.AssignmentExpression" flags="nn" index="37vLTI" />
       <concept id="1225271177708" name="jetbrains.mps.baseLanguage.structure.StringType" flags="in" index="17QB3L" />
+      <concept id="1225271221393" name="jetbrains.mps.baseLanguage.structure.NPENotEqualsExpression" flags="nn" index="17QLQc" />
       <concept id="4972933694980447171" name="jetbrains.mps.baseLanguage.structure.BaseVariableDeclaration" flags="ng" index="19Szcq">
         <child id="5680397130376446158" name="type" index="1tU5fm" />
       </concept>
@@ -176,6 +178,7 @@
       <concept id="1204053956946" name="jetbrains.mps.baseLanguage.structure.IMethodCall" flags="ng" index="1ndlxa">
         <reference id="1068499141037" name="baseMethodDeclaration" index="37wK5l" />
         <child id="1068499141038" name="actualArgument" index="37wK5m" />
+        <child id="4972241301747169160" name="typeArgument" index="3PaCim" />
       </concept>
       <concept id="1212685548494" name="jetbrains.mps.baseLanguage.structure.ClassCreator" flags="nn" index="1pGfFk" />
       <concept id="1107461130800" name="jetbrains.mps.baseLanguage.structure.Classifier" flags="ng" index="3pOWGL">
@@ -223,6 +226,9 @@
       <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" />
@@ -234,6 +240,18 @@
         <child id="1199569916463" name="body" index="1bW5cS" />
       </concept>
     </language>
+    <language id="f2801650-65d5-424e-bb1b-463a8781b786" name="jetbrains.mps.baseLanguage.javadoc">
+      <concept id="5349172909345501395" name="jetbrains.mps.baseLanguage.javadoc.structure.BaseDocComment" flags="ng" index="P$AiS">
+        <child id="8465538089690331502" name="body" index="TZ5H$" />
+      </concept>
+      <concept id="5349172909345532724" name="jetbrains.mps.baseLanguage.javadoc.structure.MethodDocComment" flags="ng" index="P$JXv" />
+      <concept id="8465538089690331500" name="jetbrains.mps.baseLanguage.javadoc.structure.CommentLine" flags="ng" index="TZ5HA">
+        <child id="8970989240999019149" name="part" index="1dT_Ay" />
+      </concept>
+      <concept id="8970989240999019143" name="jetbrains.mps.baseLanguage.javadoc.structure.TextCommentLinePart" flags="ng" index="1dT_AC">
+        <property id="8970989240999019144" name="text" index="1dT_AB" />
+      </concept>
+    </language>
     <language id="ceab5195-25ea-4f22-9b92-103b95ca8c0c" name="jetbrains.mps.lang.core">
       <concept id="1133920641626" name="jetbrains.mps.lang.core.structure.BaseConcept" flags="ng" index="2VYdi">
         <child id="5169995583184591170" name="smodelAttribute" index="lGtFl" />
@@ -689,13 +707,8 @@
               <node concept="3clFbS" id="7lt0LtQv_dV" role="3clF47">
                 <node concept="3clFbF" id="7lt0LtQv_YR" role="3cqZAp">
                   <node concept="2ShNRf" id="7lt0LtQv_YP" role="3clFbG">
-                    <node concept="1pGfFk" id="7lt0LtQvAag" role="2ShVmc">
-                      <ref role="37wK5l" node="5p8T3QHGKJ7" resolve="UnificationPredicate.UnificationSolver" />
-                      <node concept="2ShNRf" id="7lt0LtQvB46" role="37wK5m">
-                        <node concept="HV5vD" id="7lt0LtQvB47" role="2ShVmc">
-                          <ref role="HV5vE" to="oy3s:4xTpErjR15$" resolve="DefaultLogicalUnification" />
-                        </node>
-                      </node>
+                    <node concept="HV5vD" id="3gNap3fzJvU" role="2ShVmc">
+                      <ref role="HV5vE" node="6GYQG_Spvw5" resolve="UnificationPredicate.UnificationSolver" />
                     </node>
                   </node>
                 </node>
@@ -750,32 +763,6 @@
     <node concept="312cEu" id="6GYQG_Spvw5" role="jymVt">
       <property role="TrG5h" value="UnificationSolver" />
       <node concept="3Tm1VV" id="6GYQG_Spvw6" role="1B3o_S" />
-      <node concept="2tJIrI" id="4U_yxogBZmE" role="jymVt" />
-      <node concept="3clFbW" id="5p8T3QHGKJ7" role="jymVt">
-        <node concept="3cqZAl" id="5p8T3QHGKJ8" role="3clF45" />
-        <node concept="3Tm1VV" id="5uFPQ7Cmkxm" role="1B3o_S" />
-        <node concept="3clFbS" id="5p8T3QHGKJa" role="3clF47">
-          <node concept="3clFbF" id="3FIATxbQcV7" role="3cqZAp">
-            <node concept="37vLTI" id="3FIATxbQd46" role="3clFbG">
-              <node concept="37vLTw" id="3FIATxbQd6s" role="37vLTx">
-                <ref role="3cqZAo" node="3FIATxbQcKV" resolve="logicalUnification" />
-              </node>
-              <node concept="2OqwBi" id="3FIATxbQcWw" role="37vLTJ">
-                <node concept="Xjq3P" id="3FIATxbQcV5" role="2Oq$k0" />
-                <node concept="2OwXpG" id="3FIATxbQcZH" role="2OqNvi">
-                  <ref role="2Oxat5" node="6MYr6JwATAl" resolve="logicalUnification" />
-                </node>
-              </node>
-            </node>
-          </node>
-        </node>
-        <node concept="37vLTG" id="3FIATxbQcKV" role="3clF46">
-          <property role="TrG5h" value="logicalUnification" />
-          <node concept="3uibUv" id="5cDlfXsLvnr" role="1tU5fm">
-            <ref role="3uigEE" to="oy3s:4xTpErjR15$" resolve="DefaultLogicalUnification" />
-          </node>
-        </node>
-      </node>
       <node concept="2tJIrI" id="2UGjFq4h8Y6" role="jymVt" />
       <node concept="3clFb_" id="2UGjFq4m5q0" role="jymVt">
         <property role="1EzhhJ" value="false" />
@@ -850,7 +837,7 @@
             <node concept="3clFbS" id="2UGjFq4lTBV" role="3clFbx">
               <node concept="3cpWs6" id="2UGjFq4lTBW" role="3cqZAp">
                 <node concept="1rXfSq" id="2UGjFq4lTBX" role="3cqZAk">
-                  <ref role="37wK5l" node="6GYQG_SpvAS" resolve="_askUni" />
+                  <ref role="37wK5l" node="6GYQG_SpvAS" resolve="ask_term_term" />
                   <node concept="10QFUN" id="2UGjFq4lTBY" role="37wK5m">
                     <node concept="37vLTw" id="2UGjFq4lTDj" role="10QFUP">
                       <ref role="3cqZAo" node="2UGjFq4lTDc" resolve="left" />
@@ -893,7 +880,7 @@
               <node concept="3clFbS" id="2UGjFq4lTCd" role="3eOfB_">
                 <node concept="3cpWs6" id="2UGjFq4lTCe" role="3cqZAp">
                   <node concept="1rXfSq" id="2UGjFq4lTCf" role="3cqZAk">
-                    <ref role="37wK5l" node="4U_yxogC1eF" resolve="_askUni" />
+                    <ref role="37wK5l" node="4U_yxogC1eF" resolve="ask_term_logical" />
                     <node concept="10QFUN" id="2UGjFq4lTCg" role="37wK5m">
                       <node concept="37vLTw" id="2UGjFq4lTDm" role="10QFUP">
                         <ref role="3cqZAo" node="2UGjFq4lTDc" resolve="left" />
@@ -940,7 +927,7 @@
               <node concept="3clFbS" id="2UGjFq4lTCw" role="3eOfB_">
                 <node concept="3cpWs6" id="2UGjFq4lTCx" role="3cqZAp">
                   <node concept="1rXfSq" id="2UGjFq4lTCy" role="3cqZAk">
-                    <ref role="37wK5l" node="4U_yxogC1Eh" resolve="_askUni" />
+                    <ref role="37wK5l" node="4U_yxogC1Eh" resolve="ask_logical_term" />
                     <node concept="10QFUN" id="2UGjFq4lTCz" role="37wK5m">
                       <node concept="37vLTw" id="2UGjFq4lTDu" role="10QFUP">
                         <ref role="3cqZAo" node="2UGjFq4lTDc" resolve="left" />
@@ -987,7 +974,7 @@
               <node concept="3clFbS" id="2UGjFq4lTCN" role="3eOfB_">
                 <node concept="3cpWs6" id="2UGjFq4lTCO" role="3cqZAp">
                   <node concept="1rXfSq" id="2UGjFq4lTCP" role="3cqZAk">
-                    <ref role="37wK5l" node="4U_yxogC2zx" resolve="_askUni" />
+                    <ref role="37wK5l" node="4U_yxogC2zx" resolve="ask_logical_logical" />
                     <node concept="10QFUN" id="2UGjFq4lTCQ" role="37wK5m">
                       <node concept="37vLTw" id="2UGjFq4lTDr" role="10QFUP">
                         <ref role="3cqZAo" node="2UGjFq4lTDc" resolve="left" />
@@ -1130,7 +1117,7 @@
             <node concept="3clFbS" id="2UGjFq4mbkN" role="3clFbx">
               <node concept="3clFbF" id="2UGjFq4mbkO" role="3cqZAp">
                 <node concept="1rXfSq" id="2UGjFq4mbkP" role="3clFbG">
-                  <ref role="37wK5l" node="6GYQG_SpvAG" resolve="_tellUni" />
+                  <ref role="37wK5l" node="6GYQG_SpvAG" resolve="tell_term_term" />
                   <node concept="10QFUN" id="2UGjFq4mbkQ" role="37wK5m">
                     <node concept="37vLTw" id="2UGjFq4mbmm" role="10QFUP">
                       <ref role="3cqZAo" node="2UGjFq4mbm4" resolve="left" />
@@ -1173,7 +1160,7 @@
               <node concept="3clFbS" id="2UGjFq4mbl5" role="3eOfB_">
                 <node concept="3clFbF" id="2UGjFq4mbl6" role="3cqZAp">
                   <node concept="1rXfSq" id="2UGjFq4mbl7" role="3clFbG">
-                    <ref role="37wK5l" node="4U_yxogBZsK" resolve="_tellUni" />
+                    <ref role="37wK5l" node="4U_yxogBZsK" resolve="tell_term_logical" />
                     <node concept="10QFUN" id="2UGjFq4mbl8" role="37wK5m">
                       <node concept="37vLTw" id="2UGjFq4mbmk" role="10QFUP">
                         <ref role="3cqZAo" node="2UGjFq4mbm4" resolve="left" />
@@ -1220,7 +1207,7 @@
               <node concept="3clFbS" id="2UGjFq4mblo" role="3eOfB_">
                 <node concept="3clFbF" id="2UGjFq4mblp" role="3cqZAp">
                   <node concept="1rXfSq" id="2UGjFq4mblq" role="3clFbG">
-                    <ref role="37wK5l" node="4U_yxogBZLB" resolve="_tellUni" />
+                    <ref role="37wK5l" node="4U_yxogBZLB" resolve="tell_logical_term" />
                     <node concept="10QFUN" id="2UGjFq4mblr" role="37wK5m">
                       <node concept="37vLTw" id="2UGjFq4mbml" role="10QFUP">
                         <ref role="3cqZAo" node="2UGjFq4mbm4" resolve="left" />
@@ -1267,7 +1254,7 @@
               <node concept="3clFbS" id="2UGjFq4mblF" role="3eOfB_">
                 <node concept="3clFbF" id="2UGjFq4mblG" role="3cqZAp">
                   <node concept="1rXfSq" id="2UGjFq4mblH" role="3clFbG">
-                    <ref role="37wK5l" node="4U_yxogC05I" resolve="_tellUni" />
+                    <ref role="37wK5l" node="4U_yxogC05I" resolve="tell_logical_logical" />
                     <node concept="10QFUN" id="2UGjFq4mblI" role="37wK5m">
                       <node concept="37vLTw" id="2UGjFq4mbmg" role="10QFUP">
                         <ref role="3cqZAo" node="2UGjFq4mbm4" resolve="left" />
@@ -1339,7 +1326,7 @@
       <node concept="2tJIrI" id="4xBopTzmvIq" role="jymVt" />
       <node concept="3clFb_" id="6GYQG_SpvAG" role="jymVt">
         <property role="1EzhhJ" value="false" />
-        <property role="TrG5h" value="_tellUni" />
+        <property role="TrG5h" value="tell_term_term" />
         <node concept="37vLTG" id="6GYQG_SpvAH" role="3clF46">
           <property role="TrG5h" value="leftVal" />
           <node concept="16syzq" id="6MYr6JwAqQZ" role="1tU5fm">
@@ -1353,7 +1340,7 @@
           </node>
         </node>
         <node concept="3cqZAl" id="6GYQG_SpvAL" role="3clF45" />
-        <node concept="3Tmbuc" id="6MYr6JwV1tW" role="1B3o_S" />
+        <node concept="3Tm6S6" id="3gNap3fZftQ" role="1B3o_S" />
         <node concept="3clFbS" id="6GYQG_SpvAR" role="3clF47">
           <node concept="3cpWs8" id="7K4Mb_J$cIA" role="3cqZAp">
             <node concept="3cpWsn" id="7K4Mb_J$cIB" role="3cpWs9">
@@ -1450,135 +1437,474 @@
                 </node>
               </node>
               <node concept="3clFbJ" id="7FFmDVAJHGS" role="3cqZAp">
-                <node concept="3clFbS" id="7FFmDVAJHGU" role="3clFbx">
-                  <node concept="3N13vt" id="7FFmDVAJI1j" role="3cqZAp" />
-                </node>
-                <node concept="3fqX7Q" id="7FFmDVAJHXM" role="3clFbw">
-                  <node concept="2OqwBi" id="6MYr6JwRQi2" role="3fr31v">
-                    <node concept="37vLTw" id="6MYr6JwRQ2J" role="2Oq$k0">
-                      <ref role="3cqZAo" node="6MYr6JwATAl" resolve="logicalUnification" />
-                    </node>
-                    <node concept="liA8E" id="6MYr6JwRQjW" role="2OqNvi">
-                      <ref role="37wK5l" to="oy3s:3FIATxbQg_7" resolve="isLogical" />
-                      <node concept="37vLTw" id="6MYr6JwRQlP" role="37wK5m">
-                        <ref role="3cqZAo" node="1Ns6gpY7SoX" resolve="bvar" />
-                      </node>
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+                                                <property role="Xl_RC" value="Values differ " />
+                                              </node>
+                                              <node concept="2OqwBi" id="3gNap3fZqeL" role="3uHU7w">
+                                                <node concept="37vLTw" id="3gNap3fZq37" role="2Oq$k0">
+                                                  <ref role="3cqZAo" node="3gNap3fZmj4" resolve="left" />
+                                                </node>
+                                                <node concept="liA8E" id="3gNap3fZqTd" role="2OqNvi">
+                                                  <ref role="37wK5l" to="bj13:~Logical.value():java.lang.Object" resolve="value" />
+                                                </node>
+                                              </node>
+                                            </node>
+                                            <node concept="Xl_RD" id="3gNap3fZq1H" role="3uHU7w">
+                                              <property role="Xl_RC" value=" and " />
+                                            </node>
+                                          </node>
+                                          <node concept="37vLTw" id="3gNap3fZqU6" role="3uHU7w">
+                                            <ref role="3cqZAo" node="3gNap3fZluk" resolve="value" />
+                                          </node>
+                                        </node>
+                                      </node>
+                                    </node>
+                                  </node>
+                                </node>
+                                <node concept="17QLQc" id="3gNap3fZpj9" role="3clFbw">
+                                  <node concept="37vLTw" id="3gNap3fZpbe" role="3uHU7B">
+                                    <ref role="3cqZAo" node="3gNap3fZluk" resolve="value" />
+                                  </node>
+                                  <node concept="2OqwBi" id="3gNap3fZpoN" role="3uHU7w">
+                                    <node concept="37vLTw" id="3gNap3fZpk9" role="2Oq$k0">
+                                      <ref role="3cqZAo" node="3gNap3fZmj4" resolve="left" />
+                                    </node>
+                                    <node concept="liA8E" id="3gNap3fZq0K" role="2OqNvi">
+                                      <ref role="37wK5l" to="bj13:~Logical.value():java.lang.Object" resolve="value" />
+                                    </node>
+                                  </node>
+                                </node>
+                              </node>
+                              <node concept="3clFbH" id="3gNap3fZqVb" role="3cqZAp" />
+                            </node>
+                            <node concept="2OqwBi" id="3gNap3fZm_z" role="3clFbw">
+                              <node concept="37vLTw" id="3gNap3fZms0" role="2Oq$k0">
+                                <ref role="3cqZAo" node="3gNap3fZmj4" resolve="left" />
+                              </node>
+                              <node concept="liA8E" id="3gNap3fZnds" role="2OqNvi">
+                                <ref role="37wK5l" to="bj13:~Logical.isBound():boolean" resolve="isBound" />
+                              </node>
+                            </node>
+                            <node concept="9aQIb" id="3gNap3fZnen" role="9aQIa">
+                              <node concept="3clFbS" id="3gNap3fZneo" role="9aQI4">
+                                <node concept="3clFbF" id="3gNap3fZnfs" role="3cqZAp">
+                                  <node concept="2OqwBi" id="3gNap3fZnk$" role="3clFbG">
+                                    <node concept="37vLTw" id="3gNap3fZnfq" role="2Oq$k0">
+                                      <ref role="3cqZAo" node="3gNap3fZmj4" resolve="left" />
+                                    </node>
+                                    <node concept="liA8E" id="3gNap3fZp4c" role="2OqNvi">
+                                      <ref role="37wK5l" to="bj13:~JoinableLogical.setValue(java.lang.Object):void" resolve="setValue" />
+                                      <node concept="37vLTw" id="3gNap3fZp55" role="37wK5m">
+                                        <ref role="3cqZAo" node="3gNap3fZluk" resolve="value" />
+                                      </node>
+                                    </node>
+                                  </node>
+                                </node>
                               </node>
                             </node>
                           </node>
                         </node>
                       </node>
+                      <node concept="1rXfSq" id="3gNap3fZkBm" role="3clFbw">
+                        <ref role="37wK5l" node="3gNap3fZhXk" resolve="isLogicalValue" />
+                        <node concept="2OqwBi" id="3gNap3fZkFn" role="37wK5m">
+                          <node concept="37vLTw" id="3gNap3fZkCf" role="2Oq$k0">
+                            <ref role="3cqZAo" node="6SkxsMzDp28" resolve="bnd" />
+                          </node>
+                          <node concept="liA8E" id="3gNap3fZkHV" role="2OqNvi">
+                            <ref role="37wK5l" to="yt73:~Substitution$Binding.term():jetbrains.mps.unification.Term" resolve="term" />
+                          </node>
+                        </node>
+                      </node>
+                      <node concept="3clFbS" id="3gNap3fZk_A" role="3clFbx">
+                        <node concept="3cpWs8" id="3gNap3fZrMr" role="3cqZAp">
+                          <node concept="3cpWsn" id="3gNap3fZrMs" role="3cpWs9">
+                            <property role="TrG5h" value="left" />
+                            <node concept="3uibUv" id="3gNap3fZrM4" role="1tU5fm">
+                              <ref role="3uigEE" to="bj13:~JoinableLogical" resolve="JoinableLogical" />
+                              <node concept="3uibUv" id="3gNap3g07dj" role="11_B2D">
+                                <ref role="3uigEE" to="wyt6:~Object" resolve="Object" />
+                              </node>
+                            </node>
+                            <node concept="2OqwBi" id="3gNap3fZrMt" role="33vP2m">
+                              <node concept="37vLTw" id="3gNap3fZrMu" role="2Oq$k0">
+                                <ref role="3cqZAo" node="3gNap3fZiSP" resolve="bvarLogical" />
+                              </node>
+                              <node concept="liA8E" id="3gNap3fZrMv" role="2OqNvi">
+                                <ref role="37wK5l" to="bj13:~JoinableLogical.findRoot():jetbrains.mps.logic.reactor.logical.JoinableLogical" resolve="findRoot" />
+                              </node>
+                            </node>
+                          </node>
+                        </node>
+                        <node concept="3cpWs8" id="3gNap3fZkKQ" role="3cqZAp">
+                          <node concept="3cpWsn" id="3gNap3fZkKR" role="3cpWs9">
+                            <property role="TrG5h" value="right" />
+                            <node concept="3uibUv" id="3gNap3fZkKS" role="1tU5fm">
+                              <ref role="3uigEE" to="bj13:~JoinableLogical" resolve="JoinableLogical" />
+                              <node concept="3uibUv" id="3gNap3g07gr" role="11_B2D">
+                                <ref role="3uigEE" to="wyt6:~Object" resolve="Object" />
+                              </node>
+                            </node>
+                            <node concept="2OqwBi" id="3gNap3fZrSS" role="33vP2m">
+                              <node concept="2OqwBi" id="3gNap3fZkKU" role="2Oq$k0">
+                                <node concept="Xjq3P" id="3gNap3fZkKV" role="2Oq$k0" />
+                                <node concept="liA8E" id="3gNap3fZkKW" role="2OqNvi">
+                                  <ref role="37wK5l" node="3gNap3fZimy" resolve="asLogicalValue" />
+                                  <node concept="2OqwBi" id="3gNap3fZkRU" role="37wK5m">
+                                    <node concept="37vLTw" id="3gNap3fZkM8" role="2Oq$k0">
+                                      <ref role="3cqZAo" node="6SkxsMzDp28" resolve="bnd" />
+                                    </node>
+                                    <node concept="liA8E" id="3gNap3fZkUu" role="2OqNvi">
+                                      <ref role="37wK5l" to="yt73:~Substitution$Binding.term():jetbrains.mps.unification.Term" resolve="term" />
+                                    </node>
+                                  </node>
+                                  <node concept="3uibUv" id="3gNap3g07gl" role="3PaCim">
+                                    <ref role="3uigEE" to="wyt6:~Object" resolve="Object" />
+                                  </node>
+                                </node>
+                              </node>
+                              <node concept="liA8E" id="3gNap3fZsjf" role="2OqNvi">
+                                <ref role="37wK5l" to="bj13:~JoinableLogical.findRoot():jetbrains.mps.logic.reactor.logical.JoinableLogical" resolve="findRoot" />
+                              </node>
+                            </node>
+                          </node>
+                        </node>
+                        <node concept="3clFbH" id="3gNap3fZskp" role="3cqZAp" />
+                        <node concept="3clFbJ" id="3gNap3fZsmo" role="3cqZAp">
+                          <node concept="3clFbS" id="3gNap3fZsmq" role="3clFbx">
+                            <node concept="3clFbJ" id="3gNap3fZtZ0" role="3cqZAp">
+                              <node concept="3clFbS" id="3gNap3fZtZ1" role="3clFbx">
+                                <node concept="YS8fn" id="3gNap3fZtZ2" role="3cqZAp">
+                                  <node concept="2ShNRf" id="3gNap3fZtZ3" role="YScLw">
+                                    <node concept="1pGfFk" id="3gNap3fZtZ4" role="2ShVmc">
+                                      <ref role="37wK5l" to="w7la:~EvaluationFailureException.&lt;init&gt;(java.lang.String)" resolve="EvaluationFailureException" />
+                                      <node concept="3cpWs3" id="3gNap3fZtZ5" role="37wK5m">
+                                        <node concept="3cpWs3" id="3gNap3fZtZ6" role="3uHU7B">
+                                          <node concept="3cpWs3" id="3gNap3fZtZ7" role="3uHU7B">
+                                            <node concept="Xl_RD" id="3gNap3fZtZ8" role="3uHU7B">
+                                              <property role="Xl_RC" value="Values differ " />
+                                            </node>
+                                            <node concept="2OqwBi" id="3gNap3fZtZ9" role="3uHU7w">
+                                              <node concept="37vLTw" id="3gNap3fZtZa" role="2Oq$k0">
+                                                <ref role="3cqZAo" node="3gNap3fZrMs" resolve="left" />
+                                              </node>
+                                              <node concept="liA8E" id="3gNap3fZtZb" role="2OqNvi">
+                                                <ref role="37wK5l" to="bj13:~Logical.value():java.lang.Object" resolve="value" />
+                                              </node>
+                                            </node>
+                                          </node>
+                                          <node concept="Xl_RD" id="3gNap3fZtZc" role="3uHU7w">
+                                            <property role="Xl_RC" value=" and " />
+                                          </node>
+                                        </node>
+                                        <node concept="2OqwBi" id="3gNap3fZufK" role="3uHU7w">
+                                          <node concept="37vLTw" id="3gNap3fZu0t" role="2Oq$k0">
+                                            <ref role="3cqZAo" node="3gNap3fZkKR" resolve="right" />
+                                          </node>
+                                          <node concept="liA8E" id="3gNap3fZuQW" role="2OqNvi">
+                                            <ref role="37wK5l" to="bj13:~Logical.value():java.lang.Object" resolve="value" />
+                                          </node>
+                                        </node>
+                                      </node>
+                                    </node>
+                                  </node>
+                                </node>
+                              </node>
+                              <node concept="17QLQc" id="3gNap3fZtZe" role="3clFbw">
+                                <node concept="37vLTw" id="3gNap3fZtZf" role="3uHU7B">
+                                  <ref role="3cqZAo" node="6GYQG_SpvAJ" resolve="rightVal" />
+                                </node>
+                                <node concept="2OqwBi" id="3gNap3fZtZg" role="3uHU7w">
+                                  <node concept="37vLTw" id="3gNap3fZtZh" role="2Oq$k0">
+                                    <ref role="3cqZAo" node="3gNap3fZrMs" resolve="left" />
+                                  </node>
+                                  <node concept="liA8E" id="3gNap3fZtZi" role="2OqNvi">
+                                    <ref role="37wK5l" to="bj13:~Logical.value():java.lang.Object" resolve="value" />
+                                  </node>
+                                </node>
+                              </node>
+                            </node>
+                            <node concept="3clFbH" id="3gNap3fZuSi" role="3cqZAp" />
+                          </node>
+                          <node concept="1Wc70l" id="3gNap3fZth_" role="3clFbw">
+                            <node concept="2OqwBi" id="3gNap3fZtqo" role="3uHU7w">
+                              <node concept="37vLTw" id="3gNap3fZtiA" role="2Oq$k0">
+                                <ref role="3cqZAo" node="3gNap3fZkKR" resolve="right" />
+                              </node>
+                              <node concept="liA8E" id="3gNap3fZtYX" role="2OqNvi">
+                                <ref role="37wK5l" to="bj13:~Logical.isBound():boolean" resolve="isBound" />
+                              </node>
+                            </node>
+                            <node concept="2OqwBi" id="3gNap3fZsy2" role="3uHU7B">
+                              <node concept="37vLTw" id="3gNap3fZsnI" role="2Oq$k0">
+                                <ref role="3cqZAo" node="3gNap3fZrMs" resolve="left" />
+                              </node>
+                              <node concept="liA8E" id="3gNap3fZt9V" role="2OqNvi">
+                                <ref role="37wK5l" to="bj13:~Logical.isBound():boolean" resolve="isBound" />
+                              </node>
+                            </node>
+                          </node>
+                          <node concept="3eNFk2" id="7fidXgOaBTw" role="3eNLev">
+                            <node concept="3clFbS" id="7fidXgOaBTx" role="3eOfB_">
+                              <node concept="3clFbF" id="7fidXgOaBTy" role="3cqZAp">
+                                <node concept="2OqwBi" id="7fidXgOaBTz" role="3clFbG">
+                                  <node concept="37vLTw" id="7fidXgOaBT$" role="2Oq$k0">
+                                    <ref role="3cqZAo" node="3gNap3fZrMs" resolve="left" />
+                                  </node>
+                                  <node concept="liA8E" id="7fidXgOaBT_" role="2OqNvi">
+                                    <ref role="37wK5l" to="bj13:~JoinableLogical.union(jetbrains.mps.logic.reactor.logical.JoinableLogical):void" resolve="union" />
+                                    <node concept="37vLTw" id="7fidXgOaBTA" role="37wK5m">
+                                      <ref role="3cqZAo" node="3gNap3fZkKR" resolve="right" />
+                                    </node>
+                                  </node>
+                                </node>
+                              </node>
+                            </node>
+                            <node concept="3y3z36" id="7fidXgOaCdn" role="3eO9$A">
+                              <node concept="37vLTw" id="7fidXgOaCek" role="3uHU7w">
+                                <ref role="3cqZAo" node="3gNap3fZkKR" resolve="right" />
+                              </node>
+                              <node concept="37vLTw" id="7fidXgOaBU$" role="3uHU7B">
+                                <ref role="3cqZAo" node="3gNap3fZrMs" resolve="left" />
+                              </node>
+                            </node>
+                          </node>
+                        </node>
+                        <node concept="3clFbH" id="3gNap3fZkKL" role="3cqZAp" />
+                      </node>
                     </node>
+                    <node concept="3clFbH" id="3gNap3fZimu" role="3cqZAp" />
+                  </node>
+                  <node concept="1rXfSq" id="3gNap3fZijZ" role="3eO9$A">
+                    <ref role="37wK5l" node="3gNap3fZhXk" resolve="isLogicalValue" />
+                    <node concept="37vLTw" id="3gNap3fZikO" role="37wK5m">
+                      <ref role="3cqZAo" node="1Ns6gpY7SoX" resolve="bvar" />
+                    </node>
+                  </node>
+                </node>
+                <node concept="9aQIb" id="3gNap3fZil6" role="9aQIa">
+                  <node concept="3clFbS" id="3gNap3fZil7" role="9aQI4">
+                    <node concept="3N13vt" id="3gNap3fZiil" role="3cqZAp" />
                   </node>
                 </node>
               </node>
@@ -1615,7 +1941,7 @@
       <node concept="2tJIrI" id="4U_yxogBZ9l" role="jymVt" />
       <node concept="3clFb_" id="4U_yxogBZsK" role="jymVt">
         <property role="1EzhhJ" value="false" />
-        <property role="TrG5h" value="_tellUni" />
+        <property role="TrG5h" value="tell_term_logical" />
         <node concept="37vLTG" id="4U_yxogBZsL" role="3clF46">
           <property role="TrG5h" value="leftVal" />
           <node concept="16syzq" id="6MYr6Jw$tXX" role="1tU5fm">
@@ -1632,11 +1958,11 @@
           </node>
         </node>
         <node concept="3cqZAl" id="4U_yxogBZsP" role="3clF45" />
-        <node concept="3Tmbuc" id="6MYr6JwV3E0" role="1B3o_S" />
+        <node concept="3Tm6S6" id="3gNap3fZftT" role="1B3o_S" />
         <node concept="3clFbS" id="4U_yxogBZsU" role="3clF47">
           <node concept="3clFbF" id="1bm7a6EV6Wo" role="3cqZAp">
             <node concept="1rXfSq" id="1bm7a6EV6Wn" role="3clFbG">
-              <ref role="37wK5l" node="4U_yxogBZLB" resolve="_tellUni" />
+              <ref role="37wK5l" node="4U_yxogBZLB" resolve="tell_logical_term" />
               <node concept="37vLTw" id="1bm7a6EV7k2" role="37wK5m">
                 <ref role="3cqZAo" node="4U_yxogBZsN" resolve="right" />
               </node>
@@ -1656,7 +1982,7 @@
       <node concept="2tJIrI" id="4U_yxogBZsJ" role="jymVt" />
       <node concept="3clFb_" id="4U_yxogBZLB" role="jymVt">
         <property role="1EzhhJ" value="false" />
-        <property role="TrG5h" value="_tellUni" />
+        <property role="TrG5h" value="tell_logical_term" />
         <node concept="37vLTG" id="4U_yxogBZLE" role="3clF46">
           <property role="TrG5h" value="left" />
           <node concept="3uibUv" id="6MYr6Jwz28h" role="1tU5fm">
@@ -1673,7 +1999,7 @@
           </node>
         </node>
         <node concept="3cqZAl" id="4U_yxogBZLG" role="3clF45" />
-        <node concept="3Tmbuc" id="6MYr6JwV5NL" role="1B3o_S" />
+        <node concept="3Tm6S6" id="3gNap3fZftW" role="1B3o_S" />
         <node concept="3clFbS" id="4U_yxogBZLL" role="3clF47">
           <node concept="3cpWs8" id="7d$oK1$qfYc" role="3cqZAp">
             <node concept="3cpWsn" id="7d$oK1$qfYd" role="3cpWs9">
@@ -1824,7 +2150,7 @@
               <node concept="3clFbS" id="1bm7a6EV3he" role="9aQI4">
                 <node concept="3clFbF" id="6SkxsMzEU$Q" role="3cqZAp">
                   <node concept="1rXfSq" id="6SkxsMzEU$P" role="3clFbG">
-                    <ref role="37wK5l" node="6GYQG_SpvAG" resolve="_tellUni" />
+                    <ref role="37wK5l" node="6GYQG_SpvAG" resolve="tell_term_term" />
                     <node concept="37vLTw" id="6SkxsMzEUWY" role="37wK5m">
                       <ref role="3cqZAo" node="1bm7a6EUZWe" resolve="leftVal" />
                     </node>
@@ -1847,27 +2173,23 @@
       <node concept="2tJIrI" id="4U_yxogBZLA" role="jymVt" />
       <node concept="3clFb_" id="4U_yxogC05I" role="jymVt">
         <property role="1EzhhJ" value="false" />
-        <property role="TrG5h" value="_tellUni" />
+        <property role="TrG5h" value="tell_logical_logical" />
         <node concept="37vLTG" id="4U_yxogC05J" role="3clF46">
           <property role="TrG5h" value="left" />
           <node concept="3uibUv" id="6MYr6Jwz28n" role="1tU5fm">
             <ref role="3uigEE" to="bj13:~JoinableLogical" resolve="JoinableLogical" />
-            <node concept="16syzq" id="6MYr6Jw$E6F" role="11_B2D">
-              <ref role="16sUi3" node="6MYr6Jw$BQ2" resolve="TERM" />
-            </node>
+            <node concept="3qTvmN" id="7BhUeN7wuY_" role="11_B2D" />
           </node>
         </node>
         <node concept="37vLTG" id="4U_yxogC0jU" role="3clF46">
           <property role="TrG5h" value="right" />
           <node concept="3uibUv" id="6MYr6Jwz28q" role="1tU5fm">
             <ref role="3uigEE" to="bj13:~JoinableLogical" resolve="JoinableLogical" />
-            <node concept="16syzq" id="6MYr6Jw$GmS" role="11_B2D">
-              <ref role="16sUi3" node="6MYr6Jw$BQ2" resolve="TERM" />
-            </node>
+            <node concept="3qTvmN" id="7BhUeN7wuZr" role="11_B2D" />
           </node>
         </node>
         <node concept="3cqZAl" id="4U_yxogC05N" role="3clF45" />
-        <node concept="3Tmbuc" id="6MYr6JwV8aT" role="1B3o_S" />
+        <node concept="3Tm6S6" id="3gNap3fZftZ" role="1B3o_S" />
         <node concept="3clFbS" id="4U_yxogC05S" role="3clF47">
           <node concept="3clFbJ" id="4U_yxogDsYF" role="3cqZAp">
             <node concept="3clFbS" id="4U_yxogDsYG" role="3clFbx">
@@ -1888,9 +2210,7 @@
               <property role="TrG5h" value="leftRepr" />
               <node concept="3uibUv" id="6MYr6Jwz28t" role="1tU5fm">
                 <ref role="3uigEE" to="bj13:~JoinableLogical" resolve="JoinableLogical" />
-                <node concept="16syzq" id="6MYr6JwA2yy" role="11_B2D">
-                  <ref role="16sUi3" node="6MYr6Jw$BQ2" resolve="TERM" />
-                </node>
+                <node concept="3qTvmN" id="7BhUeN7wv14" role="11_B2D" />
               </node>
               <node concept="2OqwBi" id="7d$oK1$rAnG" role="33vP2m">
                 <node concept="37vLTw" id="7d$oK1$rAnH" role="2Oq$k0">
@@ -1907,9 +2227,7 @@
               <property role="TrG5h" value="rightRepr" />
               <node concept="3uibUv" id="6MYr6Jwz28w" role="1tU5fm">
                 <ref role="3uigEE" to="bj13:~JoinableLogical" resolve="JoinableLogical" />
-                <node concept="16syzq" id="6MYr6JwA3hl" role="11_B2D">
-                  <ref role="16sUi3" node="6MYr6Jw$BQ2" resolve="TERM" />
-                </node>
+                <node concept="3qTvmN" id="7BhUeN7wv1R" role="11_B2D" />
               </node>
               <node concept="2OqwBi" id="7d$oK1$rAnM" role="33vP2m">
                 <node concept="37vLTw" id="7d$oK1$rAnN" role="2Oq$k0">
@@ -1936,129 +2254,369 @@
             </node>
           </node>
           <node concept="3clFbH" id="4U_yxogDycf" role="3cqZAp" />
-          <node concept="3cpWs8" id="_oAIrg3wr2" role="3cqZAp">
-            <node concept="3cpWsn" id="_oAIrg3wr3" role="3cpWs9">
-              <property role="TrG5h" value="subs" />
-              <node concept="3uibUv" id="_oAIrg3wr4" role="1tU5fm">
-                <ref role="3uigEE" to="yt73:~Substitution" resolve="Substitution" />
+          <node concept="3cpWs8" id="7BhUeN7wATM" role="3cqZAp">
+            <node concept="3cpWsn" id="7BhUeN7wATN" role="3cpWs9">
+              <property role="TrG5h" value="metaLogical" />
+              <node concept="3uibUv" id="7BhUeN7wATE" role="1tU5fm">
+                <ref role="3uigEE" to="bj13:~MetaLogical" resolve="MetaLogical" />
+                <node concept="3qTvmN" id="7BhUeN7wATH" role="11_B2D" />
               </node>
-              <node concept="2OqwBi" id="6OkhGGhHRt9" role="33vP2m">
-                <node concept="10M0yZ" id="6OkhGGhHRid" role="2Oq$k0">
-                  <ref role="1PxDUh" to="yt73:~Unification" resolve="Unification" />
-                  <ref role="3cqZAo" to="yt73:~Unification.INSTANCE" resolve="INSTANCE" />
+              <node concept="3K4zz7" id="7BhUeN7wATO" role="33vP2m">
+                <node concept="2OqwBi" id="7BhUeN7wATP" role="3K4E3e">
+                  <node concept="37vLTw" id="7BhUeN7wATQ" role="2Oq$k0">
+                    <ref role="3cqZAo" node="7d$oK1$rAnE" resolve="leftRepr" />
+                  </node>
+                  <node concept="liA8E" id="7BhUeN7wATR" role="2OqNvi">
+                    <ref role="37wK5l" to="bj13:~Logical.metaLogical():jetbrains.mps.logic.reactor.logical.MetaLogical" resolve="metaLogical" />
+                  </node>
                 </node>
-                <node concept="liA8E" id="6OkhGGhHRCr" role="2OqNvi">
-                  <ref role="37wK5l" to="yt73:~Unification.unify(jetbrains.mps.unification.Term,jetbrains.mps.unification.Term):jetbrains.mps.unification.Substitution" resolve="unify" />
-                  <node concept="2ShNRf" id="_oAIrg3wr6" role="37wK5m">
-                    <node concept="1pGfFk" id="_oAIrg3wr7" role="2ShVmc">
-                      <ref role="37wK5l" to="oy3s:4TCblo5ML4I" resolve="LogicalDataForm" />
-                      <node concept="37vLTw" id="6HKur8$jCK9" role="37wK5m">
+                <node concept="2OqwBi" id="7BhUeN7wATS" role="3K4GZi">
+                  <node concept="37vLTw" id="7BhUeN7wATT" role="2Oq$k0">
+                    <ref role="3cqZAo" node="7d$oK1$rAnK" resolve="rightRepr" />
+                  </node>
+                  <node concept="liA8E" id="7BhUeN7wATU" role="2OqNvi">
+                    <ref role="37wK5l" to="bj13:~Logical.metaLogical():jetbrains.mps.logic.reactor.logical.MetaLogical" resolve="metaLogical" />
+                  </node>
+                </node>
+                <node concept="3y3z36" id="7BhUeN7wATV" role="3K4Cdx">
+                  <node concept="10Nm6u" id="7BhUeN7wATW" role="3uHU7w" />
+                  <node concept="2OqwBi" id="7BhUeN7wATX" role="3uHU7B">
+                    <node concept="37vLTw" id="7BhUeN7wATY" role="2Oq$k0">
+                      <ref role="3cqZAo" node="7d$oK1$rAnE" resolve="leftRepr" />
+                    </node>
+                    <node concept="liA8E" id="7BhUeN7wATZ" role="2OqNvi">
+                      <ref role="37wK5l" to="bj13:~Logical.metaLogical():jetbrains.mps.logic.reactor.logical.MetaLogical" resolve="metaLogical" />
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3cpWs8" id="7BhUeN7wxIH" role="3cqZAp">
+            <node concept="3cpWsn" id="7BhUeN7wxII" role="3cpWs9">
+              <property role="TrG5h" value="cls" />
+              <node concept="3uibUv" id="7BhUeN7wxI_" role="1tU5fm">
+                <ref role="3uigEE" to="wyt6:~Class" resolve="Class" />
+                <node concept="3qTvmN" id="7BhUeN7wxIC" role="11_B2D" />
+              </node>
+              <node concept="2OqwBi" id="7BhUeN7wCdX" role="33vP2m">
+                <node concept="37vLTw" id="7BhUeN7wAU0" role="2Oq$k0">
+                  <ref role="3cqZAo" node="7BhUeN7wATN" resolve="metaLogical" />
+                </node>
+                <node concept="liA8E" id="7fidXgO2CQD" role="2OqNvi">
+                  <ref role="37wK5l" to="bj13:~MetaLogical.type():java.lang.Class" resolve="type" />
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbH" id="7BhUeN7wv4G" role="3cqZAp" />
+          <node concept="3clFbJ" id="7BhUeN7wDuJ" role="3cqZAp">
+            <node concept="3clFbS" id="7BhUeN7wDuL" role="3clFbx">
+              <node concept="3cpWs8" id="7BhUeN7wWKv" role="3cqZAp">
+                <node concept="3cpWsn" id="7BhUeN7wWKw" role="3cpWs9">
+                  <property role="TrG5h" value="leftJRepr" />
+                  <node concept="3uibUv" id="7BhUeN7wWKf" role="1tU5fm">
+                    <ref role="3uigEE" to="bj13:~JoinableLogical" resolve="JoinableLogical" />
+                    <node concept="16syzq" id="7BhUeN7wWKi" role="11_B2D">
+                      <ref role="16sUi3" node="7BhUeN7wHwQ" resolve="TERM" />
+                    </node>
+                  </node>
+                  <node concept="10QFUN" id="7BhUeN7wWKx" role="33vP2m">
+                    <node concept="3uibUv" id="7BhUeN7wWKy" role="10QFUM">
+                      <ref role="3uigEE" to="bj13:~JoinableLogical" resolve="JoinableLogical" />
+                      <node concept="16syzq" id="7BhUeN7wWKz" role="11_B2D">
+                        <ref role="16sUi3" node="7BhUeN7wHwQ" resolve="TERM" />
+                      </node>
+                    </node>
+                    <node concept="37vLTw" id="7BhUeN7wWK$" role="10QFUP">
+                      <ref role="3cqZAo" node="7d$oK1$rAnE" resolve="leftRepr" />
+                    </node>
+                  </node>
+                </node>
+              </node>
+              <node concept="3cpWs8" id="7BhUeN7wWQ1" role="3cqZAp">
+                <node concept="3cpWsn" id="7BhUeN7wWQ2" role="3cpWs9">
+                  <property role="TrG5h" value="rightJRepr" />
+                  <node concept="3uibUv" id="7BhUeN7wWPT" role="1tU5fm">
+                    <ref role="3uigEE" to="bj13:~JoinableLogical" resolve="JoinableLogical" />
+                    <node concept="16syzq" id="7BhUeN7wWPW" role="11_B2D">
+                      <ref role="16sUi3" node="7BhUeN7wHwQ" resolve="TERM" />
+                    </node>
+                  </node>
+                  <node concept="10QFUN" id="7BhUeN7wWQ3" role="33vP2m">
+                    <node concept="37vLTw" id="7BhUeN7wWQ4" role="10QFUP">
+                      <ref role="3cqZAo" node="7d$oK1$rAnK" resolve="rightRepr" />
+                    </node>
+                    <node concept="3uibUv" id="7BhUeN7wWQ5" role="10QFUM">
+                      <ref role="3uigEE" to="bj13:~JoinableLogical" resolve="JoinableLogical" />
+                      <node concept="16syzq" id="7BhUeN7wWQ6" role="11_B2D">
+                        <ref role="16sUi3" node="7BhUeN7wHwQ" resolve="TERM" />
+                      </node>
+                    </node>
+                  </node>
+                </node>
+              </node>
+              <node concept="3clFbH" id="7BhUeN7wWVH" role="3cqZAp" />
+              <node concept="3cpWs8" id="_oAIrg3wr2" role="3cqZAp">
+                <node concept="3cpWsn" id="_oAIrg3wr3" role="3cpWs9">
+                  <property role="TrG5h" value="subs" />
+                  <node concept="3uibUv" id="_oAIrg3wr4" role="1tU5fm">
+                    <ref role="3uigEE" to="yt73:~Substitution" resolve="Substitution" />
+                  </node>
+                  <node concept="2OqwBi" id="6OkhGGhHRt9" role="33vP2m">
+                    <node concept="10M0yZ" id="6OkhGGhHRid" role="2Oq$k0">
+                      <ref role="1PxDUh" to="yt73:~Unification" resolve="Unification" />
+                      <ref role="3cqZAo" to="yt73:~Unification.INSTANCE" resolve="INSTANCE" />
+                    </node>
+                    <node concept="liA8E" id="6OkhGGhHRCr" role="2OqNvi">
+                      <ref role="37wK5l" to="yt73:~Unification.unify(jetbrains.mps.unification.Term,jetbrains.mps.unification.Term):jetbrains.mps.unification.Substitution" resolve="unify" />
+                      <node concept="2ShNRf" id="_oAIrg3wr6" role="37wK5m">
+                        <node concept="1pGfFk" id="_oAIrg3wr7" role="2ShVmc">
+                          <ref role="37wK5l" to="oy3s:4TCblo5ML4I" resolve="LogicalDataForm" />
+                          <node concept="37vLTw" id="7BhUeN7wWK_" role="37wK5m">
+                            <ref role="3cqZAo" node="7BhUeN7wWKw" resolve="leftJRepr" />
+                          </node>
+                        </node>
+                      </node>
+                      <node concept="2ShNRf" id="_oAIrg3wRH" role="37wK5m">
+                        <node concept="1pGfFk" id="_oAIrg3wRI" role="2ShVmc">
+                          <ref role="37wK5l" to="oy3s:4TCblo5ML4I" resolve="LogicalDataForm" />
+                          <node concept="37vLTw" id="7BhUeN7wWQ7" role="37wK5m">
+                            <ref role="3cqZAo" node="7BhUeN7wWQ2" resolve="rightJRepr" />
+                          </node>
+                        </node>
+                      </node>
+                    </node>
+                  </node>
+                </node>
+              </node>
+              <node concept="3SKdUt" id="_oAIrg3yoq" role="3cqZAp">
+                <node concept="3SKdUq" id="_oAIrg3yos" role="3SKWNk">
+                  <property role="3SKdUp" value="check for occurrences" />
+                </node>
+              </node>
+              <node concept="3clFbJ" id="_oAIrg3xkc" role="3cqZAp">
+                <node concept="3clFbS" id="_oAIrg3xkd" role="3clFbx">
+                  <node concept="YS8fn" id="_oAIrg3xke" role="3cqZAp">
+                    <node concept="2ShNRf" id="_oAIrg3xkf" role="YScLw">
+                      <node concept="1pGfFk" id="_oAIrg3xkg" role="2ShVmc">
+                        <ref role="37wK5l" to="w7la:~EvaluationFailureException.&lt;init&gt;(java.lang.String)" resolve="EvaluationFailureException" />
+                        <node concept="3cpWs3" id="_oAIrg3xkh" role="37wK5m">
+                          <node concept="3cpWs3" id="_oAIrg3xki" role="3uHU7B">
+                            <node concept="3cpWs3" id="_oAIrg3xkj" role="3uHU7B">
+                              <node concept="3cpWs3" id="_oAIrg3xkk" role="3uHU7B">
+                                <node concept="3cpWs3" id="_oAIrg3xkl" role="3uHU7B">
+                                  <node concept="Xl_RD" id="_oAIrg3xkm" role="3uHU7B">
+                                    <property role="Xl_RC" value="Cannot unify " />
+                                  </node>
+                                  <node concept="37vLTw" id="_oAIrg3xkn" role="3uHU7w">
+                                    <ref role="3cqZAo" node="4U_yxogC05J" resolve="left" />
+                                  </node>
+                                </node>
+                                <node concept="Xl_RD" id="_oAIrg3xko" role="3uHU7w">
+                                  <property role="Xl_RC" value=" and " />
+                                </node>
+                              </node>
+                              <node concept="37vLTw" id="_oAIrg3ycV" role="3uHU7w">
+                                <ref role="3cqZAo" node="4U_yxogC0jU" resolve="right" />
+                              </node>
+                            </node>
+                            <node concept="Xl_RD" id="_oAIrg3xkq" role="3uHU7w">
+                              <property role="Xl_RC" value=": " />
+                            </node>
+                          </node>
+                          <node concept="1rXfSq" id="_oAIrg3xkr" role="3uHU7w">
+                            <ref role="37wK5l" node="1MWQR5SpMLA" resolve="formatMessage" />
+                            <node concept="37vLTw" id="_oAIrg3xks" role="37wK5m">
+                              <ref role="3cqZAo" node="_oAIrg3wr3" resolve="subs" />
+                            </node>
+                          </node>
+                        </node>
+                      </node>
+                    </node>
+                  </node>
+                </node>
+                <node concept="3fqX7Q" id="_oAIrg3xkt" role="3clFbw">
+                  <node concept="2OqwBi" id="_oAIrg3xku" role="3fr31v">
+                    <node concept="37vLTw" id="_oAIrg3xkv" role="2Oq$k0">
+                      <ref role="3cqZAo" node="_oAIrg3wr3" resolve="subs" />
+                    </node>
+                    <node concept="liA8E" id="_oAIrg3xkw" role="2OqNvi">
+                      <ref role="37wK5l" to="yt73:~Substitution.isSuccessful():boolean" resolve="isSuccessful" />
+                    </node>
+                  </node>
+                </node>
+              </node>
+              <node concept="3clFbH" id="7BhUeN7wDuK" role="3cqZAp" />
+              <node concept="3clFbF" id="20WMLipxvPc" role="3cqZAp">
+                <node concept="2OqwBi" id="20WMLipxw8c" role="3clFbG">
+                  <node concept="37vLTw" id="7BhUeN7wY4r" role="2Oq$k0">
+                    <ref role="3cqZAo" node="7BhUeN7wWKw" resolve="leftJRepr" />
+                  </node>
+                  <node concept="liA8E" id="20WMLipxwje" role="2OqNvi">
+                    <ref role="37wK5l" to="bj13:~JoinableLogical.union(jetbrains.mps.logic.reactor.logical.JoinableLogical,jetbrains.mps.logic.reactor.logical.JoinableLogical$ValueReconciler):void" resolve="union" />
+                    <node concept="37vLTw" id="7BhUeN7wYdU" role="37wK5m">
+                      <ref role="3cqZAo" node="7BhUeN7wWQ2" resolve="rightJRepr" />
+                    </node>
+                    <node concept="1bVj0M" id="20WMLipxxlF" role="37wK5m">
+                      <node concept="37vLTG" id="20WMLipxxnG" role="1bW2Oz">
+                        <property role="TrG5h" value="leftVal" />
+                        <node concept="16syzq" id="7BhUeN7wHEL" role="1tU5fm">
+                          <ref role="16sUi3" node="7BhUeN7wHwQ" resolve="TERM" />
+                        </node>
+                      </node>
+                      <node concept="37vLTG" id="20WMLipxxG3" role="1bW2Oz">
+                        <property role="TrG5h" value="rightVal" />
+                        <node concept="16syzq" id="7BhUeN7wHGL" role="1tU5fm">
+                          <ref role="16sUi3" node="7BhUeN7wHwQ" resolve="TERM" />
+                        </node>
+                      </node>
+                      <node concept="3clFbS" id="20WMLipxxlH" role="1bW5cS">
+                        <node concept="3clFbF" id="20WMLipxybK" role="3cqZAp">
+                          <node concept="1rXfSq" id="20WMLipxybL" role="3clFbG">
+                            <ref role="37wK5l" node="6GYQG_SpvAG" resolve="tell_term_term" />
+                            <node concept="37vLTw" id="20WMLipxybM" role="37wK5m">
+                              <ref role="3cqZAo" node="20WMLipxxnG" resolve="leftVal" />
+                            </node>
+                            <node concept="37vLTw" id="20WMLipxybN" role="37wK5m">
+                              <ref role="3cqZAo" node="20WMLipxxG3" resolve="rightVal" />
+                            </node>
+                          </node>
+                        </node>
+                      </node>
+                    </node>
+                  </node>
+                </node>
+              </node>
+              <node concept="3clFbH" id="7BhUeN7wHNz" role="3cqZAp" />
+            </node>
+            <node concept="1Wc70l" id="7BhUeN7wFv3" role="3clFbw">
+              <node concept="3y3z36" id="7BhUeN7wFZg" role="3uHU7B">
+                <node concept="10Nm6u" id="7BhUeN7wG0X" role="3uHU7w" />
+                <node concept="37vLTw" id="7BhUeN7wFwQ" role="3uHU7B">
+                  <ref role="3cqZAo" node="7BhUeN7wxII" resolve="cls" />
+                </node>
+              </node>
+              <node concept="2OqwBi" id="7BhUeN7wERD" role="3uHU7w">
+                <node concept="3VsKOn" id="7BhUeN7wD$7" role="2Oq$k0">
+                  <ref role="3VsUkX" to="yt73:~Term" resolve="Term" />
+                </node>
+                <node concept="liA8E" id="7BhUeN7wFoZ" role="2OqNvi">
+                  <ref role="37wK5l" to="wyt6:~Class.isAssignableFrom(java.lang.Class):boolean" resolve="isAssignableFrom" />
+                  <node concept="37vLTw" id="7BhUeN7wFsx" role="37wK5m">
+                    <ref role="3cqZAo" node="7BhUeN7wxII" resolve="cls" />
+                  </node>
+                </node>
+              </node>
+            </node>
+            <node concept="9aQIb" id="7BhUeN7wHLZ" role="9aQIa">
+              <node concept="3clFbS" id="7BhUeN7wHM0" role="9aQI4">
+                <node concept="3cpWs8" id="7BhUeN7xYA1" role="3cqZAp">
+                  <node concept="3cpWsn" id="7BhUeN7xYA2" role="3cpWs9">
+                    <property role="TrG5h" value="leftJRepr" />
+                    <node concept="3uibUv" id="7BhUeN7xYA3" role="1tU5fm">
+                      <ref role="3uigEE" to="bj13:~JoinableLogical" resolve="JoinableLogical" />
+                      <node concept="3uibUv" id="7BhUeN7xYEJ" role="11_B2D">
+                        <ref role="3uigEE" to="wyt6:~Object" resolve="Object" />
+                      </node>
+                    </node>
+                    <node concept="10QFUN" id="7BhUeN7xYA5" role="33vP2m">
+                      <node concept="3uibUv" id="7BhUeN7xYA6" role="10QFUM">
+                        <ref role="3uigEE" to="bj13:~JoinableLogical" resolve="JoinableLogical" />
+                        <node concept="3uibUv" id="7BhUeN7xYGr" role="11_B2D">
+                          <ref role="3uigEE" to="wyt6:~Object" resolve="Object" />
+                        </node>
+                      </node>
+                      <node concept="37vLTw" id="7BhUeN7xYA8" role="10QFUP">
                         <ref role="3cqZAo" node="7d$oK1$rAnE" resolve="leftRepr" />
                       </node>
                     </node>
                   </node>
-                  <node concept="2ShNRf" id="_oAIrg3wRH" role="37wK5m">
-                    <node concept="1pGfFk" id="_oAIrg3wRI" role="2ShVmc">
-                      <ref role="37wK5l" to="oy3s:4TCblo5ML4I" resolve="LogicalDataForm" />
-                      <node concept="37vLTw" id="6HKur8$jD0Z" role="37wK5m">
+                </node>
+                <node concept="3cpWs8" id="7BhUeN7xYA9" role="3cqZAp">
+                  <node concept="3cpWsn" id="7BhUeN7xYAa" role="3cpWs9">
+                    <property role="TrG5h" value="rightJRepr" />
+                    <node concept="3uibUv" id="7BhUeN7xYAb" role="1tU5fm">
+                      <ref role="3uigEE" to="bj13:~JoinableLogical" resolve="JoinableLogical" />
+                      <node concept="3uibUv" id="7BhUeN7xYF_" role="11_B2D">
+                        <ref role="3uigEE" to="wyt6:~Object" resolve="Object" />
+                      </node>
+                    </node>
+                    <node concept="10QFUN" id="7BhUeN7xYAd" role="33vP2m">
+                      <node concept="37vLTw" id="7BhUeN7xYAe" role="10QFUP">
                         <ref role="3cqZAo" node="7d$oK1$rAnK" resolve="rightRepr" />
                       </node>
-                    </node>
-                  </node>
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-          <node concept="3SKdUt" id="_oAIrg3yoq" role="3cqZAp">
-            <node concept="3SKdUq" id="_oAIrg3yos" role="3SKWNk">
-              <property role="3SKdUp" value="check for occurrences" />
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-          <node concept="3clFbJ" id="_oAIrg3xkc" role="3cqZAp">
-            <node concept="3clFbS" id="_oAIrg3xkd" role="3clFbx">
-              <node concept="YS8fn" id="_oAIrg3xke" role="3cqZAp">
-                <node concept="2ShNRf" id="_oAIrg3xkf" role="YScLw">
-                  <node concept="1pGfFk" id="_oAIrg3xkg" role="2ShVmc">
-                    <ref role="37wK5l" to="w7la:~EvaluationFailureException.&lt;init&gt;(java.lang.String)" resolve="EvaluationFailureException" />
-                    <node concept="3cpWs3" id="_oAIrg3xkh" role="37wK5m">
-                      <node concept="3cpWs3" id="_oAIrg3xki" role="3uHU7B">
-                        <node concept="3cpWs3" id="_oAIrg3xkj" role="3uHU7B">
-                          <node concept="3cpWs3" id="_oAIrg3xkk" role="3uHU7B">
-                            <node concept="3cpWs3" id="_oAIrg3xkl" role="3uHU7B">
-                              <node concept="Xl_RD" id="_oAIrg3xkm" role="3uHU7B">
-                                <property role="Xl_RC" value="Cannot unify " />
-                              </node>
-                              <node concept="37vLTw" id="_oAIrg3xkn" role="3uHU7w">
-                                <ref role="3cqZAo" node="4U_yxogC05J" resolve="left" />
-                              </node>
-                            </node>
-                            <node concept="Xl_RD" id="_oAIrg3xko" role="3uHU7w">
-                              <property role="Xl_RC" value=" and " />
-                            </node>
-                          </node>
-                          <node concept="37vLTw" id="_oAIrg3ycV" role="3uHU7w">
-                            <ref role="3cqZAo" node="4U_yxogC0jU" resolve="right" />
-                          </node>
-                        </node>
-                        <node concept="Xl_RD" id="_oAIrg3xkq" role="3uHU7w">
-                          <property role="Xl_RC" value=": " />
-                        </node>
-                      </node>
-                      <node concept="1rXfSq" id="_oAIrg3xkr" role="3uHU7w">
-                        <ref role="37wK5l" node="1MWQR5SpMLA" resolve="formatMessage" />
-                        <node concept="37vLTw" id="_oAIrg3xks" role="37wK5m">
-                          <ref role="3cqZAo" node="_oAIrg3wr3" resolve="subs" />
+                      <node concept="3uibUv" id="7BhUeN7xYAf" role="10QFUM">
+                        <ref role="3uigEE" to="bj13:~JoinableLogical" resolve="JoinableLogical" />
+                        <node concept="3uibUv" id="7BhUeN7xYHh" role="11_B2D">
+                          <ref role="3uigEE" to="wyt6:~Object" resolve="Object" />
                         </node>
                       </node>
                     </node>
                   </node>
                 </node>
-              </node>
-            </node>
-            <node concept="3fqX7Q" id="_oAIrg3xkt" role="3clFbw">
-              <node concept="2OqwBi" id="_oAIrg3xku" role="3fr31v">
-                <node concept="37vLTw" id="_oAIrg3xkv" role="2Oq$k0">
-                  <ref role="3cqZAo" node="_oAIrg3wr3" resolve="subs" />
-                </node>
-                <node concept="liA8E" id="_oAIrg3xkw" role="2OqNvi">
-                  <ref role="37wK5l" to="yt73:~Substitution.isSuccessful():boolean" resolve="isSuccessful" />
-                </node>
-              </node>
-            </node>
-          </node>
-          <node concept="3clFbH" id="_oAIrg3oA2" role="3cqZAp" />
-          <node concept="3clFbF" id="20WMLipxvPc" role="3cqZAp">
-            <node concept="2OqwBi" id="20WMLipxw8c" role="3clFbG">
-              <node concept="37vLTw" id="20WMLipxvPa" role="2Oq$k0">
-                <ref role="3cqZAo" node="7d$oK1$rAnE" resolve="leftRepr" />
-              </node>
-              <node concept="liA8E" id="20WMLipxwje" role="2OqNvi">
-                <ref role="37wK5l" to="bj13:~JoinableLogical.union(jetbrains.mps.logic.reactor.logical.JoinableLogical,jetbrains.mps.logic.reactor.logical.JoinableLogical$ValueReconciler):void" resolve="union" />
-                <node concept="37vLTw" id="20WMLipxwMt" role="37wK5m">
-                  <ref role="3cqZAo" node="7d$oK1$rAnK" resolve="rightRepr" />
-                </node>
-                <node concept="1bVj0M" id="20WMLipxxlF" role="37wK5m">
-                  <node concept="37vLTG" id="20WMLipxxnG" role="1bW2Oz">
-                    <property role="TrG5h" value="leftVal" />
-                    <node concept="16syzq" id="20WMLipxxxg" role="1tU5fm">
-                      <ref role="16sUi3" node="6MYr6Jw$BQ2" resolve="TERM" />
+                <node concept="3clFbH" id="7BhUeN7xY__" role="3cqZAp" />
+                <node concept="3clFbF" id="7BhUeN7wHSI" role="3cqZAp">
+                  <node concept="2OqwBi" id="7BhUeN7wHSJ" role="3clFbG">
+                    <node concept="37vLTw" id="7BhUeN7xYWp" role="2Oq$k0">
+                      <ref role="3cqZAo" node="7BhUeN7xYA2" resolve="leftJRepr" />
                     </node>
-                  </node>
-                  <node concept="37vLTG" id="20WMLipxxG3" role="1bW2Oz">
-                    <property role="TrG5h" value="rightVal" />
-                    <node concept="16syzq" id="20WMLipxxQi" role="1tU5fm">
-                      <ref role="16sUi3" node="6MYr6Jw$BQ2" resolve="TERM" />
-                    </node>
-                  </node>
-                  <node concept="3clFbS" id="20WMLipxxlH" role="1bW5cS">
-                    <node concept="3clFbF" id="20WMLipxybK" role="3cqZAp">
-                      <node concept="1rXfSq" id="20WMLipxybL" role="3clFbG">
-                        <ref role="37wK5l" node="6GYQG_SpvAG" resolve="_tellUni" />
-                        <node concept="37vLTw" id="20WMLipxybM" role="37wK5m">
-                          <ref role="3cqZAo" node="20WMLipxxnG" resolve="leftVal" />
+                    <node concept="liA8E" id="7BhUeN7wHSL" role="2OqNvi">
+                      <ref role="37wK5l" to="bj13:~JoinableLogical.union(jetbrains.mps.logic.reactor.logical.JoinableLogical,jetbrains.mps.logic.reactor.logical.JoinableLogical$ValueReconciler):void" resolve="union" />
+                      <node concept="37vLTw" id="7BhUeN7xZbc" role="37wK5m">
+                        <ref role="3cqZAo" node="7BhUeN7xYAa" resolve="rightJRepr" />
+                      </node>
+                      <node concept="1bVj0M" id="7BhUeN7wHSN" role="37wK5m">
+                        <node concept="37vLTG" id="7BhUeN7wHSO" role="1bW2Oz">
+                          <property role="TrG5h" value="leftVal" />
+                          <node concept="3uibUv" id="7BhUeN7wHU1" role="1tU5fm">
+                            <ref role="3uigEE" to="wyt6:~Object" resolve="Object" />
+                          </node>
                         </node>
-                        <node concept="37vLTw" id="20WMLipxybN" role="37wK5m">
-                          <ref role="3cqZAo" node="20WMLipxxG3" resolve="rightVal" />
+                        <node concept="37vLTG" id="7BhUeN7wHSQ" role="1bW2Oz">
+                          <property role="TrG5h" value="rightVal" />
+                          <node concept="3uibUv" id="7BhUeN7wHWn" role="1tU5fm">
+                            <ref role="3uigEE" to="wyt6:~Object" resolve="Object" />
+                          </node>
+                        </node>
+                        <node concept="3clFbS" id="7BhUeN7wHSS" role="1bW5cS">
+                          <node concept="3clFbJ" id="7BhUeN7wJgb" role="3cqZAp">
+                            <node concept="17QLQc" id="7BhUeN7wJro" role="3clFbw">
+                              <node concept="37vLTw" id="7BhUeN7wJt5" role="3uHU7w">
+                                <ref role="3cqZAo" node="7BhUeN7wHSQ" resolve="rightVal" />
+                              </node>
+                              <node concept="37vLTw" id="7BhUeN7wJjt" role="3uHU7B">
+                                <ref role="3cqZAo" node="7BhUeN7wHSO" resolve="leftVal" />
+                              </node>
+                            </node>
+                            <node concept="3clFbS" id="7BhUeN7wJgd" role="3clFbx">
+                              <node concept="YS8fn" id="7BhUeN7wJEZ" role="3cqZAp">
+                                <node concept="2ShNRf" id="7BhUeN7wJF0" role="YScLw">
+                                  <node concept="1pGfFk" id="7BhUeN7wJF1" role="2ShVmc">
+                                    <ref role="37wK5l" to="w7la:~EvaluationFailureException.&lt;init&gt;(java.lang.String)" resolve="EvaluationFailureException" />
+                                    <node concept="3cpWs3" id="7BhUeN7wJF2" role="37wK5m">
+                                      <node concept="3cpWs3" id="7BhUeN7wJF3" role="3uHU7B">
+                                        <node concept="3cpWs3" id="7BhUeN7wJF4" role="3uHU7B">
+                                          <node concept="Xl_RD" id="7BhUeN7wJF5" role="3uHU7B">
+                                            <property role="Xl_RC" value="Values differ " />
+                                          </node>
+                                          <node concept="37vLTw" id="7BhUeN7wJRY" role="3uHU7w">
+                                            <ref role="3cqZAo" node="7BhUeN7wHSO" resolve="leftVal" />
+                                          </node>
+                                        </node>
+                                        <node concept="Xl_RD" id="7BhUeN7wJF9" role="3uHU7w">
+                                          <property role="Xl_RC" value=" and " />
+                                        </node>
+                                      </node>
+                                      <node concept="37vLTw" id="7BhUeN7wJVl" role="3uHU7w">
+                                        <ref role="3cqZAo" node="7BhUeN7wHSQ" resolve="rightVal" />
+                                      </node>
+                                    </node>
+                                  </node>
+                                </node>
+                              </node>
+                            </node>
+                          </node>
                         </node>
                       </node>
                     </node>
@@ -2068,9 +2626,9 @@
             </node>
           </node>
         </node>
-        <node concept="16euLQ" id="6MYr6Jw$BQ2" role="16eVyc">
+        <node concept="16euLQ" id="7BhUeN7wHwQ" role="16eVyc">
           <property role="TrG5h" value="TERM" />
-          <node concept="3uibUv" id="6MYr6Jw$Dzp" role="3ztrMU">
+          <node concept="3uibUv" id="7BhUeN7wH$J" role="3ztrMU">
             <ref role="3uigEE" to="yt73:~Term" resolve="Term" />
           </node>
         </node>
@@ -2078,7 +2636,7 @@
       <node concept="2tJIrI" id="7K4Mb_JvMKB" role="jymVt" />
       <node concept="3clFb_" id="6GYQG_SpvAS" role="jymVt">
         <property role="1EzhhJ" value="false" />
-        <property role="TrG5h" value="_askUni" />
+        <property role="TrG5h" value="ask_term_term" />
         <node concept="37vLTG" id="6GYQG_SpvAT" role="3clF46">
           <property role="TrG5h" value="leftVal" />
           <node concept="16syzq" id="6MYr6JwA_zT" role="1tU5fm">
@@ -2092,7 +2650,7 @@
           </node>
         </node>
         <node concept="10P_77" id="4U_yxogC8WW" role="3clF45" />
-        <node concept="3Tmbuc" id="6MYr6JwVawF" role="1B3o_S" />
+        <node concept="3Tm6S6" id="3gNap3fZfu2" role="1B3o_S" />
         <node concept="3clFbS" id="6GYQG_SpvB3" role="3clF47">
           <node concept="3cpWs8" id="7K4Mb_J$cIU" role="3cqZAp">
             <node concept="3cpWsn" id="7K4Mb_J$cIV" role="3cpWs9">
@@ -2153,11 +2711,9 @@
                       <node concept="1rXfSq" id="6xYPVrp_rZR" role="3fr31v">
                         <ref role="37wK5l" node="6xYPVrp$baS" resolve="askLogicalUni" />
                         <node concept="2OqwBi" id="6MYr6JwBr3Q" role="37wK5m">
-                          <node concept="37vLTw" id="6MYr6JwBr0K" role="2Oq$k0">
-                            <ref role="3cqZAo" node="6MYr6JwATAl" resolve="logicalUnification" />
-                          </node>
+                          <node concept="Xjq3P" id="3gNap3fzIB5" role="2Oq$k0" />
                           <node concept="liA8E" id="6MYr6JwBrpD" role="2OqNvi">
-                            <ref role="37wK5l" to="oy3s:3FIATxbQg$N" resolve="logical" />
+                            <ref role="37wK5l" node="3FIATxbQg$N" resolve="asLogicalTerm" />
                             <node concept="2OqwBi" id="6xYPVrp_rZW" role="37wK5m">
                               <node concept="37vLTw" id="6xYPVrp_rZX" role="2Oq$k0">
                                 <ref role="3cqZAo" node="6xYPVrp_s03" resolve="bnd" />
@@ -2179,13 +2735,12 @@
                       </node>
                     </node>
                   </node>
+                  <node concept="3clFbH" id="3gNap3fZwPf" role="3cqZAp" />
                 </node>
                 <node concept="2OqwBi" id="6MYr6JwSiJ2" role="3clFbw">
-                  <node concept="37vLTw" id="6MYr6JwShod" role="2Oq$k0">
-                    <ref role="3cqZAo" node="6MYr6JwATAl" resolve="logicalUnification" />
-                  </node>
+                  <node concept="Xjq3P" id="3gNap3fzDyj" role="2Oq$k0" />
                   <node concept="liA8E" id="6MYr6JwSk3X" role="2OqNvi">
-                    <ref role="37wK5l" to="oy3s:3FIATxbQg_7" resolve="isLogical" />
+                    <ref role="37wK5l" node="3FIATxbQg_7" resolve="isLogicalTerm" />
                     <node concept="2OqwBi" id="7FFmDVAMd61" role="37wK5m">
                       <node concept="37vLTw" id="7FFmDVAMd62" role="2Oq$k0">
                         <ref role="3cqZAo" node="6xYPVrp_s03" resolve="bnd" />
@@ -2196,6 +2751,202 @@
                     </node>
                   </node>
                 </node>
+                <node concept="3eNFk2" id="3gNap3fZwPw" role="3eNLev">
+                  <node concept="3clFbS" id="3gNap3fZwPx" role="3eOfB_">
+                    <node concept="3cpWs8" id="3gNap3fZ_6S" role="3cqZAp">
+                      <node concept="3cpWsn" id="3gNap3fZ_6T" role="3cpWs9">
+                        <property role="TrG5h" value="left" />
+                        <node concept="3uibUv" id="3gNap3fZ_6U" role="1tU5fm">
+                          <ref role="3uigEE" to="bj13:~JoinableLogical" resolve="JoinableLogical" />
+                          <node concept="3qTvmN" id="3gNap3fZ_6V" role="11_B2D" />
+                        </node>
+                        <node concept="2OqwBi" id="3gNap3fZ_6W" role="33vP2m">
+                          <node concept="1eOMI4" id="3gNap3g91F3" role="2Oq$k0">
+                            <node concept="2OqwBi" id="3gNap3g91EX" role="1eOMHV">
+                              <node concept="Xjq3P" id="3gNap3g91EY" role="2Oq$k0" />
+                              <node concept="liA8E" id="3gNap3g91EZ" role="2OqNvi">
+                                <ref role="37wK5l" node="3gNap3fZimy" resolve="asLogicalValue" />
+                                <node concept="2OqwBi" id="3gNap3g91F0" role="37wK5m">
+                                  <node concept="37vLTw" id="3gNap3g91F1" role="2Oq$k0">
+                                    <ref role="3cqZAo" node="6xYPVrp_s03" resolve="bnd" />
+                                  </node>
+                                  <node concept="liA8E" id="3gNap3g91F2" role="2OqNvi">
+                                    <ref role="37wK5l" to="yt73:~Substitution$Binding.var():jetbrains.mps.unification.Term" resolve="var" />
+                                  </node>
+                                </node>
+                              </node>
+                            </node>
+                          </node>
+                          <node concept="liA8E" id="3gNap3fZ_6Y" role="2OqNvi">
+                            <ref role="37wK5l" to="bj13:~JoinableLogical.findRoot():jetbrains.mps.logic.reactor.logical.JoinableLogical" resolve="findRoot" />
+                          </node>
+                        </node>
+                      </node>
+                    </node>
+                    <node concept="3clFbJ" id="3gNap3fZ$VP" role="3cqZAp">
+                      <node concept="3clFbS" id="3gNap3fZ$VR" role="3clFbx">
+                        <node concept="3cpWs8" id="3gNap3fZ_6Z" role="3cqZAp">
+                          <node concept="3cpWsn" id="3gNap3fZ_70" role="3cpWs9">
+                            <property role="TrG5h" value="right" />
+                            <node concept="3uibUv" id="3gNap3fZ_71" role="1tU5fm">
+                              <ref role="3uigEE" to="bj13:~JoinableLogical" resolve="JoinableLogical" />
+                              <node concept="3qTvmN" id="3gNap3fZ_72" role="11_B2D" />
+                            </node>
+                            <node concept="2OqwBi" id="3gNap3fZ_73" role="33vP2m">
+                              <node concept="2OqwBi" id="3gNap3fZ_74" role="2Oq$k0">
+                                <node concept="Xjq3P" id="3gNap3fZ_75" role="2Oq$k0" />
+                                <node concept="liA8E" id="3gNap3fZ_76" role="2OqNvi">
+                                  <ref role="37wK5l" node="3gNap3fZimy" resolve="asLogicalValue" />
+                                  <node concept="2OqwBi" id="3gNap3fZ_77" role="37wK5m">
+                                    <node concept="37vLTw" id="3gNap3fZ_78" role="2Oq$k0">
+                                      <ref role="3cqZAo" node="6xYPVrp_s03" resolve="bnd" />
+                                    </node>
+                                    <node concept="liA8E" id="3gNap3fZ_79" role="2OqNvi">
+                                      <ref role="37wK5l" to="yt73:~Substitution$Binding.term():jetbrains.mps.unification.Term" resolve="term" />
+                                    </node>
+                                  </node>
+                                </node>
+                              </node>
+                              <node concept="liA8E" id="3gNap3fZ_7a" role="2OqNvi">
+                                <ref role="37wK5l" to="bj13:~JoinableLogical.findRoot():jetbrains.mps.logic.reactor.logical.JoinableLogical" resolve="findRoot" />
+                              </node>
+                            </node>
+                          </node>
+                        </node>
+                        <node concept="3clFbH" id="3gNap3fZ$VQ" role="3cqZAp" />
+                        <node concept="3clFbJ" id="3gNap3fZ_8M" role="3cqZAp">
+                          <node concept="3clFbS" id="3gNap3fZ_8O" role="3clFbx">
+                            <node concept="3clFbJ" id="3gNap3fZHlX" role="3cqZAp">
+                              <node concept="3clFbS" id="3gNap3fZHlY" role="3clFbx">
+                                <node concept="3cpWs6" id="3gNap3fZHnv" role="3cqZAp">
+                                  <node concept="3clFbT" id="3gNap3fZHoq" role="3cqZAk" />
+                                </node>
+                              </node>
+                              <node concept="17QLQc" id="3gNap3fZHmd" role="3clFbw">
+                                <node concept="37vLTw" id="3gNap3fZHme" role="3uHU7B">
+                                  <ref role="3cqZAo" node="6GYQG_SpvAV" resolve="rightVal" />
+                                </node>
+                                <node concept="2OqwBi" id="3gNap3fZHmf" role="3uHU7w">
+                                  <node concept="37vLTw" id="3gNap3fZHmg" role="2Oq$k0">
+                                    <ref role="3cqZAo" node="3gNap3fZ_6T" resolve="left" />
+                                  </node>
+                                  <node concept="liA8E" id="3gNap3fZHmh" role="2OqNvi">
+                                    <ref role="37wK5l" to="bj13:~Logical.value():java.lang.Object" resolve="value" />
+                                  </node>
+                                </node>
+                              </node>
+                            </node>
+                          </node>
+                          <node concept="1Wc70l" id="3gNap3fZA5P" role="3clFbw">
+                            <node concept="2OqwBi" id="3gNap3fZAeI" role="3uHU7w">
+                              <node concept="37vLTw" id="3gNap3fZA6Q" role="2Oq$k0">
+                                <ref role="3cqZAo" node="3gNap3fZ_70" resolve="right" />
+                              </node>
+                              <node concept="liA8E" id="3gNap3fZAJG" role="2OqNvi">
+                                <ref role="37wK5l" to="bj13:~Logical.isBound():boolean" resolve="isBound" />
+                              </node>
+                            </node>
+                            <node concept="2OqwBi" id="3gNap3fZ_m6" role="3uHU7B">
+                              <node concept="37vLTw" id="3gNap3fZ_a8" role="2Oq$k0">
+                                <ref role="3cqZAo" node="3gNap3fZ_6T" resolve="left" />
+                              </node>
+                              <node concept="liA8E" id="3gNap3fZ_Y5" role="2OqNvi">
+                                <ref role="37wK5l" to="bj13:~Logical.isBound():boolean" resolve="isBound" />
+                              </node>
+                            </node>
+                          </node>
+                        </node>
+                        <node concept="3clFbH" id="3gNap3g8ZRD" role="3cqZAp" />
+                      </node>
+                      <node concept="1rXfSq" id="3gNap3fZ$XQ" role="3clFbw">
+                        <ref role="37wK5l" node="3gNap3fZhXk" resolve="isLogicalValue" />
+                        <node concept="2OqwBi" id="3gNap3fZ_39" role="37wK5m">
+                          <node concept="37vLTw" id="3gNap3fZ$YJ" role="2Oq$k0">
+                            <ref role="3cqZAo" node="6xYPVrp_s03" resolve="bnd" />
+                          </node>
+                          <node concept="liA8E" id="3gNap3fZ_5H" role="2OqNvi">
+                            <ref role="37wK5l" to="yt73:~Substitution$Binding.term():jetbrains.mps.unification.Term" resolve="term" />
+                          </node>
+                        </node>
+                      </node>
+                      <node concept="3eNFk2" id="3gNap3g8ZRz" role="3eNLev">
+                        <node concept="2ZW3vV" id="3gNap3g91$1" role="3eO9$A">
+                          <node concept="3uibUv" id="3gNap3g91$i" role="2ZW6by">
+                            <ref role="3uigEE" to="6exd:2xQ7eRAD2dj" resolve="Value" />
+                          </node>
+                          <node concept="2OqwBi" id="3gNap3g91ii" role="2ZW6bz">
+                            <node concept="37vLTw" id="3gNap3g8ZT7" role="2Oq$k0">
+                              <ref role="3cqZAo" node="6xYPVrp_s03" resolve="bnd" />
+                            </node>
+                            <node concept="liA8E" id="3gNap3g91kQ" role="2OqNvi">
+                              <ref role="37wK5l" to="yt73:~Substitution$Binding.term():jetbrains.mps.unification.Term" resolve="term" />
+                            </node>
+                          </node>
+                        </node>
+                        <node concept="3clFbS" id="3gNap3g8ZR_" role="3eOfB_">
+                          <node concept="3clFbJ" id="3gNap3g91_b" role="3cqZAp">
+                            <node concept="1Wc70l" id="3gNap3g93Qz" role="3clFbw">
+                              <node concept="17QLQc" id="3gNap3g94a1" role="3uHU7w">
+                                <node concept="2OqwBi" id="3gNap3g94hS" role="3uHU7w">
+                                  <node concept="1eOMI4" id="3gNap3g94bV" role="2Oq$k0">
+                                    <node concept="10QFUN" id="3gNap3g94bS" role="1eOMHV">
+                                      <node concept="3uibUv" id="3gNap3g94bX" role="10QFUM">
+                                        <ref role="3uigEE" to="6exd:2xQ7eRAD2dj" resolve="Value" />
+                                      </node>
+                                      <node concept="2OqwBi" id="3gNap3g94bY" role="10QFUP">
+                                        <node concept="37vLTw" id="3gNap3g94bZ" role="2Oq$k0">
+                                          <ref role="3cqZAo" node="6xYPVrp_s03" resolve="bnd" />
+                                        </node>
+                                        <node concept="liA8E" id="3gNap3g94c0" role="2OqNvi">
+                                          <ref role="37wK5l" to="yt73:~Substitution$Binding.term():jetbrains.mps.unification.Term" resolve="term" />
+                                        </node>
+                                      </node>
+                                    </node>
+                                  </node>
+                                  <node concept="liA8E" id="3gNap3g94p1" role="2OqNvi">
+                                    <ref role="37wK5l" to="6exd:1msb0mq8QTt" resolve="symbol" />
+                                  </node>
+                                </node>
+                                <node concept="2OqwBi" id="3gNap3g93Zu" role="3uHU7B">
+                                  <node concept="37vLTw" id="3gNap3g93R$" role="2Oq$k0">
+                                    <ref role="3cqZAo" node="3gNap3fZ_6T" resolve="left" />
+                                  </node>
+                                  <node concept="liA8E" id="3gNap3g945W" role="2OqNvi">
+                                    <ref role="37wK5l" to="bj13:~Logical.value():java.lang.Object" resolve="value" />
+                                  </node>
+                                </node>
+                              </node>
+                              <node concept="2OqwBi" id="3gNap3g939Q" role="3uHU7B">
+                                <node concept="37vLTw" id="3gNap3g91Hg" role="2Oq$k0">
+                                  <ref role="3cqZAo" node="3gNap3fZ_6T" resolve="left" />
+                                </node>
+                                <node concept="liA8E" id="3gNap3g93IL" role="2OqNvi">
+                                  <ref role="37wK5l" to="bj13:~Logical.isBound():boolean" resolve="isBound" />
+                                </node>
+                              </node>
+                            </node>
+                            <node concept="3clFbS" id="3gNap3g91_d" role="3clFbx">
+                              <node concept="3cpWs6" id="3gNap3g94pU" role="3cqZAp">
+                                <node concept="3clFbT" id="3gNap3g94qQ" role="3cqZAk" />
+                              </node>
+                            </node>
+                          </node>
+                        </node>
+                      </node>
+                    </node>
+                  </node>
+                  <node concept="1rXfSq" id="3gNap3fZwRg" role="3eO9$A">
+                    <ref role="37wK5l" node="3gNap3fZhXk" resolve="isLogicalValue" />
+                    <node concept="2OqwBi" id="3gNap3fZzvm" role="37wK5m">
+                      <node concept="37vLTw" id="3gNap3fZwS8" role="2Oq$k0">
+                        <ref role="3cqZAo" node="6xYPVrp_s03" resolve="bnd" />
+                      </node>
+                      <node concept="liA8E" id="3gNap3fZzxU" role="2OqNvi">
+                        <ref role="37wK5l" to="yt73:~Substitution$Binding.var():jetbrains.mps.unification.Term" resolve="var" />
+                      </node>
+                    </node>
+                  </node>
+                </node>
               </node>
             </node>
             <node concept="3cpWsn" id="6xYPVrp_s03" role="1Duv9x">
@@ -2230,7 +2981,7 @@
       <node concept="2tJIrI" id="4U_yxogC15$" role="jymVt" />
       <node concept="3clFb_" id="4U_yxogC1eF" role="jymVt">
         <property role="1EzhhJ" value="false" />
-        <property role="TrG5h" value="_askUni" />
+        <property role="TrG5h" value="ask_term_logical" />
         <node concept="37vLTG" id="4U_yxogC1eG" role="3clF46">
           <property role="TrG5h" value="leftVal" />
           <node concept="16syzq" id="6MYr6Jw$Nv3" role="1tU5fm">
@@ -2247,11 +2998,11 @@
           </node>
         </node>
         <node concept="10P_77" id="4U_yxogC8Kd" role="3clF45" />
-        <node concept="3Tmbuc" id="6MYr6JwVcEQ" role="1B3o_S" />
+        <node concept="3Tm6S6" id="3gNap3fZfu5" role="1B3o_S" />
         <node concept="3clFbS" id="4U_yxogC1eP" role="3clF47">
           <node concept="3clFbF" id="1bm7a6EVoQx" role="3cqZAp">
             <node concept="1rXfSq" id="1bm7a6EVoQw" role="3clFbG">
-              <ref role="37wK5l" node="4U_yxogC1Eh" resolve="_askUni" />
+              <ref role="37wK5l" node="4U_yxogC1Eh" resolve="ask_logical_term" />
               <node concept="37vLTw" id="1bm7a6EVpBI" role="37wK5m">
                 <ref role="3cqZAo" node="4U_yxogC1eI" resolve="right" />
               </node>
@@ -2271,7 +3022,7 @@
       <node concept="2tJIrI" id="4U_yxogC1eE" role="jymVt" />
       <node concept="3clFb_" id="4U_yxogC1Eh" role="jymVt">
         <property role="1EzhhJ" value="false" />
-        <property role="TrG5h" value="_askUni" />
+        <property role="TrG5h" value="ask_logical_term" />
         <node concept="37vLTG" id="4U_yxogC1Ek" role="3clF46">
           <property role="TrG5h" value="left" />
           <node concept="3uibUv" id="6MYr6Jwz28A" role="1tU5fm">
@@ -2288,7 +3039,7 @@
           </node>
         </node>
         <node concept="10P_77" id="4U_yxogC8y$" role="3clF45" />
-        <node concept="3Tmbuc" id="6MYr6JwVeTp" role="1B3o_S" />
+        <node concept="3Tm6S6" id="3gNap3fZfum" role="1B3o_S" />
         <node concept="3clFbS" id="4U_yxogC1Er" role="3clF47">
           <node concept="3cpWs8" id="4U_yxogDnOi" role="3cqZAp">
             <node concept="3cpWsn" id="4U_yxogDnOj" role="3cpWs9">
@@ -2415,11 +3166,9 @@
                       <node concept="1rXfSq" id="6xYPVrp_lHp" role="3fr31v">
                         <ref role="37wK5l" node="6xYPVrp$baS" resolve="askLogicalUni" />
                         <node concept="2OqwBi" id="6MYr6JwBrCz" role="37wK5m">
-                          <node concept="37vLTw" id="6MYr6JwBr_r" role="2Oq$k0">
-                            <ref role="3cqZAo" node="6MYr6JwATAl" resolve="logicalUnification" />
-                          </node>
+                          <node concept="Xjq3P" id="3gNap3fzIBX" role="2Oq$k0" />
                           <node concept="liA8E" id="6MYr6JwBrFD" role="2OqNvi">
-                            <ref role="37wK5l" to="oy3s:3FIATxbQg$N" resolve="logical" />
+                            <ref role="37wK5l" node="3FIATxbQg$N" resolve="asLogicalTerm" />
                             <node concept="2OqwBi" id="6xYPVrp_lHu" role="37wK5m">
                               <node concept="37vLTw" id="6xYPVrp_lHv" role="2Oq$k0">
                                 <ref role="3cqZAo" node="6xYPVrp_lH_" resolve="bnd" />
@@ -2443,11 +3192,9 @@
                   </node>
                 </node>
                 <node concept="2OqwBi" id="6MYr6JwSs0w" role="3clFbw">
-                  <node concept="37vLTw" id="6MYr6JwSq_O" role="2Oq$k0">
-                    <ref role="3cqZAo" node="6MYr6JwATAl" resolve="logicalUnification" />
-                  </node>
+                  <node concept="Xjq3P" id="3gNap3fzDzT" role="2Oq$k0" />
                   <node concept="liA8E" id="6MYr6JwStqX" role="2OqNvi">
-                    <ref role="37wK5l" to="oy3s:3FIATxbQg_7" resolve="isLogical" />
+                    <ref role="37wK5l" node="3FIATxbQg_7" resolve="isLogicalTerm" />
                     <node concept="2OqwBi" id="7FFmDVAJ$YW" role="37wK5m">
                       <node concept="37vLTw" id="7FFmDVAJ$YX" role="2Oq$k0">
                         <ref role="3cqZAo" node="6xYPVrp_lH_" resolve="bnd" />
@@ -2492,27 +3239,23 @@
       <node concept="2tJIrI" id="7txc83pee6D" role="jymVt" />
       <node concept="3clFb_" id="4U_yxogC2zx" role="jymVt">
         <property role="1EzhhJ" value="false" />
-        <property role="TrG5h" value="_askUni" />
+        <property role="TrG5h" value="ask_logical_logical" />
         <node concept="37vLTG" id="4U_yxogC2zy" role="3clF46">
           <property role="TrG5h" value="left" />
           <node concept="3uibUv" id="6MYr6Jwz28G" role="1tU5fm">
             <ref role="3uigEE" to="bj13:~JoinableLogical" resolve="JoinableLogical" />
-            <node concept="16syzq" id="6MYr6Jw_7Kb" role="11_B2D">
-              <ref role="16sUi3" node="6MYr6Jw_3D$" resolve="TERM" />
-            </node>
+            <node concept="3qTvmN" id="7BhUeN7wJYP" role="11_B2D" />
           </node>
         </node>
         <node concept="37vLTG" id="4U_yxogC2z$" role="3clF46">
           <property role="TrG5h" value="right" />
           <node concept="3uibUv" id="6MYr6Jwz28J" role="1tU5fm">
             <ref role="3uigEE" to="bj13:~JoinableLogical" resolve="JoinableLogical" />
-            <node concept="16syzq" id="6MYr6Jw_9Ww" role="11_B2D">
-              <ref role="16sUi3" node="6MYr6Jw_3D$" resolve="TERM" />
-            </node>
+            <node concept="3qTvmN" id="7BhUeN7wJZF" role="11_B2D" />
           </node>
         </node>
         <node concept="10P_77" id="4U_yxogC8eN" role="3clF45" />
-        <node concept="3Tmbuc" id="6MYr6JwVhky" role="1B3o_S" />
+        <node concept="3Tm6S6" id="3gNap3fZfup" role="1B3o_S" />
         <node concept="3clFbS" id="4U_yxogC2zF" role="3clF47">
           <node concept="3clFbJ" id="4U_yxogC7xg" role="3cqZAp">
             <node concept="3clFbS" id="4U_yxogC7xh" role="3clFbx">
@@ -2537,11 +3280,7 @@
               <property role="TrG5h" value="leftRepr" />
               <node concept="3uibUv" id="6MYr6Jwz28M" role="1tU5fm">
                 <ref role="3uigEE" to="bj13:~JoinableLogical" resolve="JoinableLogical" />
-                <node concept="3qUE_q" id="6MYr6Jwz28N" role="11_B2D">
-                  <node concept="3uibUv" id="6MYr6Jwz28O" role="3qUE_r">
-                    <ref role="3uigEE" to="yt73:~Term" resolve="Term" />
-                  </node>
-                </node>
+                <node concept="3qTvmN" id="7BhUeN7wK1e" role="11_B2D" />
               </node>
               <node concept="2OqwBi" id="7d$oK1$nL7H" role="33vP2m">
                 <node concept="37vLTw" id="7d$oK1$nL7I" role="2Oq$k0">
@@ -2558,11 +3297,7 @@
               <property role="TrG5h" value="rightRepr" />
               <node concept="3uibUv" id="6MYr6Jwz28P" role="1tU5fm">
                 <ref role="3uigEE" to="bj13:~JoinableLogical" resolve="JoinableLogical" />
-                <node concept="3qUE_q" id="6MYr6Jwz28Q" role="11_B2D">
-                  <node concept="3uibUv" id="6MYr6Jwz28R" role="3qUE_r">
-                    <ref role="3uigEE" to="yt73:~Term" resolve="Term" />
-                  </node>
-                </node>
+                <node concept="3qTvmN" id="7BhUeN7wK22" role="11_B2D" />
               </node>
               <node concept="2OqwBi" id="7d$oK1$nLDP" role="33vP2m">
                 <node concept="37vLTw" id="7d$oK1$nLDQ" role="2Oq$k0">
@@ -2574,6 +3309,7 @@
               </node>
             </node>
           </node>
+          <node concept="3clFbH" id="7BhUeN7wK3A" role="3cqZAp" />
           <node concept="3clFbJ" id="4U_yxogCA7q" role="3cqZAp">
             <node concept="3clFbS" id="4U_yxogCA7t" role="3clFbx">
               <node concept="3cpWs6" id="4U_yxogCANm" role="3cqZAp">
@@ -2600,195 +3336,361 @@
               </node>
             </node>
             <node concept="22lmx$" id="5oZZzbrizbK" role="3clFbw">
-              <node concept="3clFbC" id="5oZZzbrizbL" role="3uHU7w">
-                <node concept="10Nm6u" id="5oZZzbrizbM" role="3uHU7w" />
-                <node concept="2OqwBi" id="5oZZzbrizbN" role="3uHU7B">
-                  <node concept="37vLTw" id="7d$oK1$ojqV" role="2Oq$k0">
+              <node concept="3fqX7Q" id="7BhUeN7wQKy" role="3uHU7w">
+                <node concept="2OqwBi" id="7BhUeN7wQK$" role="3fr31v">
+                  <node concept="37vLTw" id="7BhUeN7wQK_" role="2Oq$k0">
                     <ref role="3cqZAo" node="7d$oK1$nLDN" resolve="rightRepr" />
                   </node>
-                  <node concept="liA8E" id="5oZZzbrizbP" role="2OqNvi">
-                    <ref role="37wK5l" to="bj13:~Logical.value():java.lang.Object" resolve="value" />
+                  <node concept="liA8E" id="7BhUeN7wQKA" role="2OqNvi">
+                    <ref role="37wK5l" to="bj13:~Logical.isBound():boolean" resolve="isBound" />
                   </node>
                 </node>
               </node>
-              <node concept="3clFbC" id="5oZZzbrizbQ" role="3uHU7B">
-                <node concept="2OqwBi" id="5oZZzbrizbR" role="3uHU7B">
-                  <node concept="37vLTw" id="7d$oK1$oiZM" role="2Oq$k0">
+              <node concept="3fqX7Q" id="7BhUeN7wQ0V" role="3uHU7B">
+                <node concept="2OqwBi" id="7BhUeN7wQ0X" role="3fr31v">
+                  <node concept="37vLTw" id="7BhUeN7wQ0Y" role="2Oq$k0">
                     <ref role="3cqZAo" node="7d$oK1$nL7F" resolve="leftRepr" />
                   </node>
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-                    <ref role="37wK5l" to="bj13:~Logical.value():java.lang.Object" resolve="value" />
+                  <node concept="liA8E" id="7BhUeN7wQ0Z" role="2OqNvi">
+                    <ref role="37wK5l" to="bj13:~Logical.isBound():boolean" resolve="isBound" />
                   </node>
                 </node>
-                <node concept="10Nm6u" id="5oZZzbrizbU" role="3uHU7w" />
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbH" id="7BhUeN7wKab" role="3cqZAp" />
+          <node concept="3cpWs8" id="7BhUeN7wK6U" role="3cqZAp">
+            <node concept="3cpWsn" id="7BhUeN7wK6V" role="3cpWs9">
+              <property role="TrG5h" value="metaLogical" />
+              <node concept="3uibUv" id="7BhUeN7wK6W" role="1tU5fm">
+                <ref role="3uigEE" to="bj13:~MetaLogical" resolve="MetaLogical" />
+                <node concept="3qTvmN" id="7BhUeN7wK6X" role="11_B2D" />
+              </node>
+              <node concept="3K4zz7" id="7BhUeN7wK6Y" role="33vP2m">
+                <node concept="2OqwBi" id="7BhUeN7wK6Z" role="3K4E3e">
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+                    <ref role="3cqZAo" node="7d$oK1$nL7F" resolve="leftRepr" />
+                  </node>
+                  <node concept="liA8E" id="7BhUeN7wK71" role="2OqNvi">
+                    <ref role="37wK5l" to="bj13:~Logical.metaLogical():jetbrains.mps.logic.reactor.logical.MetaLogical" resolve="metaLogical" />
+                  </node>
+                </node>
+                <node concept="2OqwBi" id="7BhUeN7wK72" role="3K4GZi">
+                  <node concept="37vLTw" id="7BhUeN7wK73" role="2Oq$k0">
+                    <ref role="3cqZAo" node="7d$oK1$nLDN" resolve="rightRepr" />
+                  </node>
+                  <node concept="liA8E" id="7BhUeN7wK74" role="2OqNvi">
+                    <ref role="37wK5l" to="bj13:~Logical.metaLogical():jetbrains.mps.logic.reactor.logical.MetaLogical" resolve="metaLogical" />
+                  </node>
+                </node>
+                <node concept="3y3z36" id="7BhUeN7wK75" role="3K4Cdx">
+                  <node concept="10Nm6u" id="7BhUeN7wK76" role="3uHU7w" />
+                  <node concept="2OqwBi" id="7BhUeN7wK77" role="3uHU7B">
+                    <node concept="37vLTw" id="7BhUeN7wK78" role="2Oq$k0">
+                      <ref role="3cqZAo" node="7d$oK1$nL7F" resolve="leftRepr" />
+                    </node>
+                    <node concept="liA8E" id="7BhUeN7wK79" role="2OqNvi">
+                      <ref role="37wK5l" to="bj13:~Logical.metaLogical():jetbrains.mps.logic.reactor.logical.MetaLogical" resolve="metaLogical" />
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3cpWs8" id="7BhUeN7wK7a" role="3cqZAp">
+            <node concept="3cpWsn" id="7BhUeN7wK7b" role="3cpWs9">
+              <property role="TrG5h" value="cls" />
+              <node concept="3uibUv" id="7BhUeN7wK7c" role="1tU5fm">
+                <ref role="3uigEE" to="wyt6:~Class" resolve="Class" />
+                <node concept="3qTvmN" id="7BhUeN7wK7d" role="11_B2D" />
+              </node>
+              <node concept="2OqwBi" id="7BhUeN7wK7e" role="33vP2m">
+                <node concept="37vLTw" id="7BhUeN7wK7f" role="2Oq$k0">
+                  <ref role="3cqZAo" node="7BhUeN7wK6V" resolve="metaLogical" />
+                </node>
+                <node concept="liA8E" id="7fidXgO2GjJ" role="2OqNvi">
+                  <ref role="37wK5l" to="bj13:~MetaLogical.type():java.lang.Class" resolve="type" />
+                </node>
               </node>
             </node>
           </node>
           <node concept="3clFbH" id="4U_yxogDeXH" role="3cqZAp" />
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-                <ref role="3uigEE" to="yt73:~Substitution$Binding" resolve="Substitution.Binding" />
+            <node concept="3eNFk2" id="7BhUeN7wQTR" role="3eNLev">
+              <node concept="3clFbS" id="7BhUeN7wQTS" role="3eOfB_">
+                <node concept="3clFbJ" id="7BhUeN7wQYT" role="3cqZAp">
+                  <node concept="17QLQc" id="7BhUeN7wSm7" role="3clFbw">
+                    <node concept="2OqwBi" id="7BhUeN7wSu7" role="3uHU7w">
+                      <node concept="37vLTw" id="7BhUeN7wSoI" role="2Oq$k0">
+                        <ref role="3cqZAo" node="7d$oK1$nLDN" resolve="rightRepr" />
+                      </node>
+                      <node concept="liA8E" id="7BhUeN7wSOD" role="2OqNvi">
+                        <ref role="37wK5l" to="bj13:~Logical.value():java.lang.Object" resolve="value" />
+                      </node>
+                    </node>
+                    <node concept="2OqwBi" id="7BhUeN7wRR_" role="3uHU7B">
+                      <node concept="37vLTw" id="7BhUeN7wR1r" role="2Oq$k0">
+                        <ref role="3cqZAo" node="7d$oK1$nL7F" resolve="leftRepr" />
+                      </node>
+                      <node concept="liA8E" id="7BhUeN7wSi2" role="2OqNvi">
+                        <ref role="37wK5l" to="bj13:~Logical.value():java.lang.Object" resolve="value" />
+                      </node>
+                    </node>
+                  </node>
+                  <node concept="3clFbS" id="7BhUeN7wQYV" role="3clFbx">
+                    <node concept="3cpWs6" id="7fidXgOasV3" role="3cqZAp">
+                      <node concept="3clFbT" id="7fidXgOasVY" role="3cqZAk" />
+                    </node>
+                  </node>
+                </node>
               </node>
-            </node>
-            <node concept="2OqwBi" id="6xYPVrp_5wB" role="1DdaDG">
-              <node concept="37vLTw" id="6xYPVrp_5wC" role="2Oq$k0">
-                <ref role="3cqZAo" node="7K4Mb_J$cJv" resolve="subs" />
-              </node>
-              <node concept="liA8E" id="6xYPVrp_5wD" role="2OqNvi">
-                <ref role="37wK5l" to="yt73:~Substitution.bindings():java.util.Collection" resolve="bindings" />
+              <node concept="22lmx$" id="7BhUeN7wQUF" role="3eO9$A">
+                <node concept="2OqwBi" id="7BhUeN7wQUH" role="3uHU7w">
+                  <node concept="37vLTw" id="7BhUeN7wQUI" role="2Oq$k0">
+                    <ref role="3cqZAo" node="7d$oK1$nLDN" resolve="rightRepr" />
+                  </node>
+                  <node concept="liA8E" id="7BhUeN7wQUJ" role="2OqNvi">
+                    <ref role="37wK5l" to="bj13:~Logical.isBound():boolean" resolve="isBound" />
+                  </node>
+                </node>
+                <node concept="2OqwBi" id="7BhUeN7wQUL" role="3uHU7B">
+                  <node concept="37vLTw" id="7BhUeN7wQUM" role="2Oq$k0">
+                    <ref role="3cqZAo" node="7d$oK1$nL7F" resolve="leftRepr" />
+                  </node>
+                  <node concept="liA8E" id="7BhUeN7wQUN" role="2OqNvi">
+                    <ref role="37wK5l" to="bj13:~Logical.isBound():boolean" resolve="isBound" />
+                  </node>
+                </node>
               </node>
             </node>
           </node>
-          <node concept="3clFbH" id="24Vro6cSyV3" role="3cqZAp" />
+          <node concept="3clFbH" id="7BhUeN7wQQ0" role="3cqZAp" />
           <node concept="3cpWs6" id="3HJTsBn3F6H" role="3cqZAp">
             <node concept="3clFbT" id="6xYPVrp_bB3" role="3cqZAk">
               <property role="3clFbU" value="true" />
@@ -2845,7 +3747,7 @@
             <node concept="3clFbS" id="2T1p0CFz6ao" role="3clFbx">
               <node concept="3cpWs6" id="2T1p0CFz6ap" role="3cqZAp">
                 <node concept="1rXfSq" id="2T1p0CFz6aq" role="3cqZAk">
-                  <ref role="37wK5l" node="4U_yxogC1Eh" resolve="_askUni" />
+                  <ref role="37wK5l" node="4U_yxogC1Eh" resolve="ask_logical_term" />
                   <node concept="10QFUN" id="2T1p0CFz6ar" role="37wK5m">
                     <node concept="3uibUv" id="2T1p0CFz6as" role="10QFUM">
                       <ref role="3uigEE" to="bj13:~JoinableLogical" resolve="JoinableLogical" />
@@ -2858,11 +3760,9 @@
                     </node>
                   </node>
                   <node concept="2OqwBi" id="2T1p0CFz6av" role="37wK5m">
-                    <node concept="37vLTw" id="2T1p0CFz6aw" role="2Oq$k0">
-                      <ref role="3cqZAo" node="6MYr6JwATAl" resolve="logicalUnification" />
-                    </node>
+                    <node concept="Xjq3P" id="3gNap3frV6S" role="2Oq$k0" />
                     <node concept="liA8E" id="2T1p0CFz6ax" role="2OqNvi">
-                      <ref role="37wK5l" to="oy3s:3FIATxbQg$x" resolve="asRoot" />
+                      <ref role="37wK5l" node="3FIATxbQg$x" resolve="asRoot" />
                       <node concept="37vLTw" id="2T1p0CFz6ay" role="37wK5m">
                         <ref role="3cqZAo" node="6xYPVrp_37O" resolve="bound" />
                       </node>
@@ -2888,7 +3788,7 @@
               <node concept="3clFbS" id="2T1p0CFz6aD" role="3eOfB_">
                 <node concept="3cpWs6" id="2T1p0CFz6aE" role="3cqZAp">
                   <node concept="1rXfSq" id="2T1p0CFz6aF" role="3cqZAk">
-                    <ref role="37wK5l" node="4U_yxogC2zx" resolve="_askUni" />
+                    <ref role="37wK5l" node="4U_yxogC2zx" resolve="ask_logical_logical" />
                     <node concept="10QFUN" id="2T1p0CFz6aG" role="37wK5m">
                       <node concept="3uibUv" id="2T1p0CFz6aH" role="10QFUM">
                         <ref role="3uigEE" to="bj13:~JoinableLogical" resolve="JoinableLogical" />
@@ -2901,11 +3801,9 @@
                       </node>
                     </node>
                     <node concept="2OqwBi" id="2T1p0CFz6aK" role="37wK5m">
-                      <node concept="37vLTw" id="2T1p0CFz6aL" role="2Oq$k0">
-                        <ref role="3cqZAo" node="6MYr6JwATAl" resolve="logicalUnification" />
-                      </node>
+                      <node concept="Xjq3P" id="3gNap3fzIDH" role="2Oq$k0" />
                       <node concept="liA8E" id="2T1p0CFz6aM" role="2OqNvi">
-                        <ref role="37wK5l" to="oy3s:3FIATxbQg$N" resolve="logical" />
+                        <ref role="37wK5l" node="3FIATxbQg$N" resolve="asLogicalTerm" />
                         <node concept="37vLTw" id="2T1p0CFz6aN" role="37wK5m">
                           <ref role="3cqZAo" node="6xYPVrp_37O" resolve="bound" />
                         </node>
@@ -3053,14 +3951,282 @@
         </node>
       </node>
       <node concept="2tJIrI" id="1bm7a6EU93j" role="jymVt" />
-      <node concept="312cEg" id="6MYr6JwATAl" role="jymVt">
-        <property role="TrG5h" value="logicalUnification" />
-        <node concept="3Tm6S6" id="6MYr6JwATAm" role="1B3o_S" />
-        <node concept="3uibUv" id="5cDlfXsLwOo" role="1tU5fm">
-          <ref role="3uigEE" to="oy3s:4xTpErjR15$" resolve="DefaultLogicalUnification" />
+      <node concept="3clFb_" id="3FIATxbQg$x" role="jymVt">
+        <property role="1EzhhJ" value="false" />
+        <property role="TrG5h" value="asRoot" />
+        <node concept="37vLTG" id="3FIATxbQg$y" role="3clF46">
+          <property role="TrG5h" value="term" />
+          <node concept="16syzq" id="3FIATxbQg$z" role="1tU5fm">
+            <ref role="16sUi3" node="3FIATxbQg$A" resolve="TERM" />
+          </node>
+        </node>
+        <node concept="16syzq" id="3FIATxbQg$$" role="3clF45">
+          <ref role="16sUi3" node="3FIATxbQg$A" resolve="TERM" />
+        </node>
+        <node concept="3Tm6S6" id="3gNap3frRyq" role="1B3o_S" />
+        <node concept="16euLQ" id="3FIATxbQg$A" role="16eVyc">
+          <property role="TrG5h" value="TERM" />
+          <node concept="3uibUv" id="3FIATxbQg$B" role="3ztrMU">
+            <ref role="3uigEE" to="yt73:~Term" resolve="Term" />
+          </node>
+        </node>
+        <node concept="3clFbS" id="3FIATxbQg$C" role="3clF47">
+          <node concept="3clFbJ" id="3gNap3frQsX" role="3cqZAp">
+            <node concept="3clFbS" id="3gNap3frQsZ" role="3clFbx">
+              <node concept="3cpWs6" id="3gNap3frReU" role="3cqZAp">
+                <node concept="10QFUN" id="3gNap3frRf2" role="3cqZAk">
+                  <node concept="2OqwBi" id="3gNap3frRf3" role="10QFUP">
+                    <node concept="1eOMI4" id="3gNap3frRf4" role="2Oq$k0">
+                      <node concept="10QFUN" id="3gNap3frRf5" role="1eOMHV">
+                        <node concept="37vLTw" id="3gNap3frRf6" role="10QFUP">
+                          <ref role="3cqZAo" node="3FIATxbQg$y" resolve="term" />
+                        </node>
+                        <node concept="3uibUv" id="3gNap3frRf7" role="10QFUM">
+                          <ref role="3uigEE" to="6exd:1bm7a6EXvsP" resolve="DataForm" />
+                        </node>
+                      </node>
+                    </node>
+                    <node concept="liA8E" id="3gNap3frRf8" role="2OqNvi">
+                      <ref role="37wK5l" to="6exd:2QE4RCGndD7" resolve="asRoot" />
+                    </node>
+                  </node>
+                  <node concept="16syzq" id="3gNap3frRf9" role="10QFUM">
+                    <ref role="16sUi3" node="3FIATxbQg$A" resolve="TERM" />
+                  </node>
+                </node>
+              </node>
+            </node>
+            <node concept="2ZW3vV" id="3gNap3frRey" role="3clFbw">
+              <node concept="3uibUv" id="3gNap3frReD" role="2ZW6by">
+                <ref role="3uigEE" to="6exd:1bm7a6EXvsP" resolve="DataForm" />
+              </node>
+              <node concept="37vLTw" id="3gNap3frQtt" role="2ZW6bz">
+                <ref role="3cqZAo" node="3FIATxbQg$y" resolve="term" />
+              </node>
+            </node>
+            <node concept="9aQIb" id="3gNap3frRfF" role="9aQIa">
+              <node concept="3clFbS" id="3gNap3frRfG" role="9aQI4">
+                <node concept="3cpWs6" id="3gNap3frRfX" role="3cqZAp">
+                  <node concept="37vLTw" id="3gNap3frRgg" role="3cqZAk">
+                    <ref role="3cqZAo" node="3FIATxbQg$y" resolve="term" />
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="P$JXv" id="3gNap3frRgA" role="lGtFl">
+          <node concept="TZ5HA" id="3gNap3frRgB" role="TZ5H$">
+            <node concept="1dT_AC" id="3gNap3frRgC" role="1dT_Ay">
+              <property role="1dT_AB" value="Type-safe asRoot operation. Copies a data form, otherwise returns the passed parameter." />
+            </node>
+          </node>
         </node>
       </node>
-      <node concept="2tJIrI" id="6MYr6JwBO6F" role="jymVt" />
+      <node concept="2tJIrI" id="3gNap3frX0L" role="jymVt" />
+      <node concept="3clFb_" id="3FIATxbQg$N" role="jymVt">
+        <property role="1EzhhJ" value="false" />
+        <property role="TrG5h" value="asLogicalTerm" />
+        <node concept="37vLTG" id="3FIATxbQg$O" role="3clF46">
+          <property role="TrG5h" value="var" />
+          <node concept="16syzq" id="3FIATxbQg$P" role="1tU5fm">
+            <ref role="16sUi3" node="3FIATxbQg$T" resolve="TERM" />
+          </node>
+        </node>
+        <node concept="3uibUv" id="3FIATxbQg$Q" role="3clF45">
+          <ref role="3uigEE" to="bj13:~JoinableLogical" resolve="JoinableLogical" />
+          <node concept="16syzq" id="3FIATxbQg$R" role="11_B2D">
+            <ref role="16sUi3" node="3FIATxbQg$T" resolve="TERM" />
+          </node>
+        </node>
+        <node concept="3Tm6S6" id="3gNap3fzEkQ" role="1B3o_S" />
+        <node concept="16euLQ" id="3FIATxbQg$T" role="16eVyc">
+          <property role="TrG5h" value="TERM" />
+          <node concept="3uibUv" id="3FIATxbQg$U" role="3ztrMU">
+            <ref role="3uigEE" to="yt73:~Term" resolve="Term" />
+          </node>
+        </node>
+        <node concept="3clFbS" id="3FIATxbQg$V" role="3clF47">
+          <node concept="3clFbJ" id="3gNap3fzF$k" role="3cqZAp">
+            <node concept="3clFbS" id="3gNap3fzF$m" role="3clFbx">
+              <node concept="3cpWs6" id="3gNap3fzGM6" role="3cqZAp">
+                <node concept="10QFUN" id="3gNap3fzGMb" role="3cqZAk">
+                  <node concept="2OqwBi" id="3gNap3fzGMc" role="10QFUP">
+                    <node concept="1eOMI4" id="3gNap3fzGMd" role="2Oq$k0">
+                      <node concept="10QFUN" id="3gNap3fzGMe" role="1eOMHV">
+                        <node concept="37vLTw" id="3gNap3fzGMf" role="10QFUP">
+                          <ref role="3cqZAo" node="3FIATxbQg$O" resolve="var" />
+                        </node>
+                        <node concept="3uibUv" id="3gNap3fMVwq" role="10QFUM">
+                          <ref role="3uigEE" to="oy3s:4TCblo5MJ1m" resolve="LogicalDataForm" />
+                          <node concept="16syzq" id="3gNap3fMVwA" role="11_B2D">
+                            <ref role="16sUi3" node="3FIATxbQg$T" resolve="TERM" />
+                          </node>
+                        </node>
+                      </node>
+                    </node>
+                    <node concept="liA8E" id="3gNap3fzGMh" role="2OqNvi">
+                      <ref role="37wK5l" to="oy3s:4TCblo5MS1o" resolve="logical" />
+                    </node>
+                  </node>
+                  <node concept="3uibUv" id="3gNap3fzGMi" role="10QFUM">
+                    <ref role="3uigEE" to="bj13:~JoinableLogical" resolve="JoinableLogical" />
+                    <node concept="16syzq" id="3gNap3fzGMj" role="11_B2D">
+                      <ref role="16sUi3" node="3FIATxbQg$T" resolve="TERM" />
+                    </node>
+                  </node>
+                </node>
+              </node>
+              <node concept="3clFbH" id="3gNap3fzGNm" role="3cqZAp" />
+            </node>
+            <node concept="2ZW3vV" id="3gNap3fzGL3" role="3clFbw">
+              <node concept="3uibUv" id="3gNap3fMVwe" role="2ZW6by">
+                <ref role="3uigEE" to="oy3s:4TCblo5MJ1m" resolve="LogicalDataForm" />
+              </node>
+              <node concept="37vLTw" id="3gNap3fzF_q" role="2ZW6bz">
+                <ref role="3cqZAo" node="3FIATxbQg$O" resolve="var" />
+              </node>
+            </node>
+            <node concept="9aQIb" id="3gNap3fzGNi" role="9aQIa">
+              <node concept="3clFbS" id="3gNap3fzGNj" role="9aQI4">
+                <node concept="YS8fn" id="3gNap3fzGOl" role="3cqZAp">
+                  <node concept="2ShNRf" id="3gNap3fzGPc" role="YScLw">
+                    <node concept="1pGfFk" id="3gNap3fzI1f" role="2ShVmc">
+                      <ref role="37wK5l" to="wyt6:~IllegalArgumentException.&lt;init&gt;()" resolve="IllegalArgumentException" />
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="2tJIrI" id="3gNap3fZiBp" role="jymVt" />
+      <node concept="3clFb_" id="3gNap3fZimy" role="jymVt">
+        <property role="1EzhhJ" value="false" />
+        <property role="TrG5h" value="asLogicalValue" />
+        <node concept="37vLTG" id="3gNap3fZimz" role="3clF46">
+          <property role="TrG5h" value="var" />
+          <node concept="16syzq" id="3gNap3fZim$" role="1tU5fm">
+            <ref role="16sUi3" node="3gNap3fZimC" resolve="T" />
+          </node>
+        </node>
+        <node concept="3uibUv" id="3gNap3fZim_" role="3clF45">
+          <ref role="3uigEE" to="bj13:~JoinableLogical" resolve="JoinableLogical" />
+          <node concept="16syzq" id="3gNap3fZimA" role="11_B2D">
+            <ref role="16sUi3" node="3gNap3fZimC" resolve="T" />
+          </node>
+        </node>
+        <node concept="3Tm6S6" id="3gNap3fZimB" role="1B3o_S" />
+        <node concept="16euLQ" id="3gNap3fZimC" role="16eVyc">
+          <property role="TrG5h" value="T" />
+        </node>
+        <node concept="3clFbS" id="3gNap3fZimE" role="3clF47">
+          <node concept="3clFbJ" id="3gNap3fZimF" role="3cqZAp">
+            <node concept="3clFbS" id="3gNap3fZimG" role="3clFbx">
+              <node concept="3cpWs6" id="3gNap3fZimH" role="3cqZAp">
+                <node concept="10QFUN" id="3gNap3fZimI" role="3cqZAk">
+                  <node concept="2OqwBi" id="3gNap3fZimJ" role="10QFUP">
+                    <node concept="1eOMI4" id="3gNap3fZimK" role="2Oq$k0">
+                      <node concept="10QFUN" id="3gNap3fZimL" role="1eOMHV">
+                        <node concept="37vLTw" id="3gNap3fZimM" role="10QFUP">
+                          <ref role="3cqZAo" node="3gNap3fZimz" resolve="var" />
+                        </node>
+                        <node concept="3uibUv" id="3gNap3fZimN" role="10QFUM">
+                          <ref role="3uigEE" to="oy3s:3gNap3fN2hw" resolve="LogicalValue" />
+                          <node concept="16syzq" id="3gNap3fZimO" role="11_B2D">
+                            <ref role="16sUi3" node="3gNap3fZimC" resolve="T" />
+                          </node>
+                        </node>
+                      </node>
+                    </node>
+                    <node concept="liA8E" id="3gNap3fZimP" role="2OqNvi">
+                      <ref role="37wK5l" to="oy3s:3gNap3fN7SD" resolve="logical" />
+                    </node>
+                  </node>
+                  <node concept="3uibUv" id="3gNap3fZimQ" role="10QFUM">
+                    <ref role="3uigEE" to="bj13:~JoinableLogical" resolve="JoinableLogical" />
+                    <node concept="16syzq" id="3gNap3fZimR" role="11_B2D">
+                      <ref role="16sUi3" node="3gNap3fZimC" resolve="T" />
+                    </node>
+                  </node>
+                </node>
+              </node>
+              <node concept="3clFbH" id="3gNap3fZimS" role="3cqZAp" />
+            </node>
+            <node concept="2ZW3vV" id="3gNap3fZimT" role="3clFbw">
+              <node concept="3uibUv" id="3gNap3fZiRQ" role="2ZW6by">
+                <ref role="3uigEE" to="oy3s:3gNap3fN2hw" resolve="LogicalValue" />
+              </node>
+              <node concept="37vLTw" id="3gNap3fZimV" role="2ZW6bz">
+                <ref role="3cqZAo" node="3gNap3fZimz" resolve="var" />
+              </node>
+            </node>
+            <node concept="9aQIb" id="3gNap3fZimW" role="9aQIa">
+              <node concept="3clFbS" id="3gNap3fZimX" role="9aQI4">
+                <node concept="YS8fn" id="3gNap3fZimY" role="3cqZAp">
+                  <node concept="2ShNRf" id="3gNap3fZimZ" role="YScLw">
+                    <node concept="1pGfFk" id="3gNap3fZin0" role="2ShVmc">
+                      <ref role="37wK5l" to="wyt6:~IllegalArgumentException.&lt;init&gt;()" resolve="IllegalArgumentException" />
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="2tJIrI" id="3gNap3fzEkW" role="jymVt" />
+      <node concept="3clFb_" id="3FIATxbQg_7" role="jymVt">
+        <property role="1EzhhJ" value="false" />
+        <property role="TrG5h" value="isLogicalTerm" />
+        <node concept="37vLTG" id="3FIATxbQg_8" role="3clF46">
+          <property role="TrG5h" value="term" />
+          <node concept="3uibUv" id="3FIATxbQg_9" role="1tU5fm">
+            <ref role="3uigEE" to="yt73:~Term" resolve="Term" />
+          </node>
+        </node>
+        <node concept="10P_77" id="3FIATxbQg_a" role="3clF45" />
+        <node concept="3Tm6S6" id="3gNap3fzEkT" role="1B3o_S" />
+        <node concept="3clFbS" id="3FIATxbQg_c" role="3clF47">
+          <node concept="3clFbF" id="3FIATxbQg_d" role="3cqZAp">
+            <node concept="2ZW3vV" id="3FIATxbQg_e" role="3clFbG">
+              <node concept="3uibUv" id="3gNap3fMVIc" role="2ZW6by">
+                <ref role="3uigEE" to="oy3s:4TCblo5MJ1m" resolve="LogicalDataForm" />
+              </node>
+              <node concept="37vLTw" id="3FIATxbQg_g" role="2ZW6bz">
+                <ref role="3cqZAo" node="3FIATxbQg_8" resolve="term" />
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="2tJIrI" id="3gNap3fzDfM" role="jymVt" />
+      <node concept="3clFb_" id="3gNap3fZhXk" role="jymVt">
+        <property role="1EzhhJ" value="false" />
+        <property role="TrG5h" value="isLogicalValue" />
+        <node concept="37vLTG" id="3gNap3fZhXl" role="3clF46">
+          <property role="TrG5h" value="term" />
+          <node concept="3uibUv" id="3gNap3fZhXm" role="1tU5fm">
+            <ref role="3uigEE" to="yt73:~Term" resolve="Term" />
+          </node>
+        </node>
+        <node concept="10P_77" id="3gNap3fZhXn" role="3clF45" />
+        <node concept="3Tm6S6" id="3gNap3fZhXo" role="1B3o_S" />
+        <node concept="3clFbS" id="3gNap3fZhXp" role="3clF47">
+          <node concept="3clFbF" id="3gNap3fZhXq" role="3cqZAp">
+            <node concept="2ZW3vV" id="3gNap3fZhXr" role="3clFbG">
+              <node concept="3uibUv" id="3gNap3fZidi" role="2ZW6by">
+                <ref role="3uigEE" to="oy3s:3gNap3fN2hw" resolve="LogicalValue" />
+              </node>
+              <node concept="37vLTw" id="3gNap3fZhXt" role="2ZW6bz">
+                <ref role="3cqZAo" node="3gNap3fZhXl" resolve="term" />
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="2tJIrI" id="3gNap3fZhXj" role="jymVt" />
       <node concept="3uibUv" id="60zk4o77o9G" role="1zkMxy">
         <ref role="3uigEE" to="w7la:~AbstractSolver" resolve="AbstractSolver" />
       </node>
diff --git a/coderules/languages/jetbrains.mps.logic/runtime/models/jetbrains.mps.logic.program.mps b/coderules/languages/jetbrains.mps.logic/runtime/models/jetbrains.mps.logic.program.mps
index dd7a5c7f..3a33d8a8 100644
--- a/coderules/languages/jetbrains.mps.logic/runtime/models/jetbrains.mps.logic.program.mps
+++ b/coderules/languages/jetbrains.mps.logic/runtime/models/jetbrains.mps.logic.program.mps
@@ -34,13 +34,6 @@
       <concept id="1202948039474" name="jetbrains.mps.baseLanguage.structure.InstanceMethodCallOperation" flags="nn" index="liA8E" />
       <concept id="1224500799915" name="jetbrains.mps.baseLanguage.structure.BitwiseXorExpression" flags="nn" index="pVQyQ" />
       <concept id="1465982738277781862" name="jetbrains.mps.baseLanguage.structure.PlaceholderMember" flags="ng" index="2tJIrI" />
-      <concept id="1239714755177" name="jetbrains.mps.baseLanguage.structure.AbstractUnaryNumberOperation" flags="nn" index="2$Kvd9">
-        <child id="1239714902950" name="expression" index="2$L3a6" />
-      </concept>
-      <concept id="1173175405605" name="jetbrains.mps.baseLanguage.structure.ArrayAccessExpression" flags="nn" index="AH0OO">
-        <child id="1173175577737" name="index" index="AHEQo" />
-        <child id="1173175590490" name="array" index="AHHXb" />
-      </concept>
       <concept id="1188207840427" name="jetbrains.mps.baseLanguage.structure.AnnotationInstance" flags="nn" index="2AHcQZ">
         <reference id="1188208074048" name="annotation" index="2AI5Lk" />
       </concept>
@@ -77,7 +70,6 @@
       <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="1081236700938" name="jetbrains.mps.baseLanguage.structure.StaticMethodDeclaration" flags="ig" index="2YIFZL" />
       <concept id="1081236700937" name="jetbrains.mps.baseLanguage.structure.StaticMethodCall" flags="nn" index="2YIFZM">
         <reference id="1144433194310" name="classConcept" index="1Pybhc" />
       </concept>
@@ -89,7 +81,6 @@
         <child id="1081256993304" name="leftExpression" index="2ZW6bz" />
       </concept>
       <concept id="1070534058343" name="jetbrains.mps.baseLanguage.structure.NullLiteral" flags="nn" index="10Nm6u" />
-      <concept id="1070534370425" name="jetbrains.mps.baseLanguage.structure.IntegerType" flags="in" index="10Oyi0" />
       <concept id="1070534644030" name="jetbrains.mps.baseLanguage.structure.BooleanType" flags="in" index="10P_77" />
       <concept id="1070534760951" name="jetbrains.mps.baseLanguage.structure.ArrayType" flags="in" index="10Q1$e">
         <child id="1070534760952" name="componentType" index="10Q1$1" />
@@ -104,7 +95,6 @@
       </concept>
       <concept id="1068390468198" name="jetbrains.mps.baseLanguage.structure.ClassConcept" flags="ig" index="312cEu">
         <property id="1075300953594" name="abstractClass" index="1sVAO0" />
-        <property id="1221565133444" name="isFinal" index="1EXbeo" />
         <child id="1095933932569" name="implementedInterface" index="EKbjA" />
         <child id="1165602531693" name="superclass" index="1zkMxy" />
       </concept>
@@ -112,9 +102,7 @@
         <property id="1176718929932" name="isFinal" index="3TUv4t" />
         <child id="1068431790190" name="initializer" index="33vP2m" />
       </concept>
-      <concept id="1109279763828" name="jetbrains.mps.baseLanguage.structure.TypeVariableDeclaration" flags="ng" index="16euLQ">
-        <child id="1214996921760" name="bound" index="3ztrMU" />
-      </concept>
+      <concept id="1109279763828" name="jetbrains.mps.baseLanguage.structure.TypeVariableDeclaration" flags="ng" index="16euLQ" />
       <concept id="1109279851642" name="jetbrains.mps.baseLanguage.structure.GenericDeclaration" flags="ng" index="16eOlS">
         <child id="1109279881614" name="typeVariableDeclaration" index="16eVyc" />
       </concept>
@@ -158,13 +146,7 @@
         <child id="1068581517665" name="statement" index="3cqZAp" />
       </concept>
       <concept id="1068580123140" name="jetbrains.mps.baseLanguage.structure.ConstructorDeclaration" flags="ig" index="3clFbW" />
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-        <property id="1068580320021" name="value" index="3cmrfH" />
-      </concept>
       <concept id="1068581242875" name="jetbrains.mps.baseLanguage.structure.PlusExpression" flags="nn" index="3cpWs3" />
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-        <child id="1068581517676" name="expression" index="3cqZAk" />
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       <concept id="1068581242864" name="jetbrains.mps.baseLanguage.structure.LocalVariableDeclarationStatement" flags="nn" index="3cpWs8">
         <child id="1068581242865" name="localVariableDeclaration" index="3cpWs9" />
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@@ -177,8 +159,6 @@
       <concept id="1079359253375" name="jetbrains.mps.baseLanguage.structure.ParenthesizedExpression" flags="nn" index="1eOMI4">
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-      <concept id="1081506762703" name="jetbrains.mps.baseLanguage.structure.GreaterThanExpression" flags="nn" index="3eOSWO" />
-      <concept id="1081506773034" name="jetbrains.mps.baseLanguage.structure.LessThanExpression" flags="nn" index="3eOVzh" />
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         <child id="1081516765348" name="expression" index="3fr31v" />
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@@ -193,7 +173,6 @@
         <child id="1212687122400" name="typeParameter" index="1pMfVU" />
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       <concept id="1107461130800" name="jetbrains.mps.baseLanguage.structure.Classifier" flags="ng" index="3pOWGL">
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       <concept id="1171903607971" name="jetbrains.mps.baseLanguage.structure.WildCardType" flags="in" index="3qTvmN" />
@@ -206,15 +185,7 @@
         <child id="1081773367579" name="rightExpression" index="3uHU7w" />
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       </concept>
-      <concept id="1214918800624" name="jetbrains.mps.baseLanguage.structure.PostfixIncrementExpression" flags="nn" index="3uNrnE" />
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@@ -224,10 +195,6 @@
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-        <child id="1144231408325" name="iteration" index="1Dwrff" />
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@@ -1149,9 +1116,9 @@
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-                        <ref role="37wK5l" node="4TCblo5NqWF" resolve="instantiateMetaLogicals" />
-                        <ref role="1Pybhc" node="677NV565N1x" resolve="LogicalUtil" />
+                      <node concept="2YIFZM" id="3gNap3fNlJv" role="37wK5m">
+                        <ref role="37wK5l" to="oy3s:4TCblo5NqWF" resolve="instantiateMetaLogicals" />
+                        <ref role="1Pybhc" to="oy3s:677NV565N1x" resolve="LogicalUtil" />
                         <node concept="10QFUN" id="60zk4o6SxJA" role="37wK5m">
                           <node concept="3uibUv" id="60zk4o6SxJB" role="10QFUM">
                             <ref role="3uigEE" to="6exd:1bm7a6EXvsP" resolve="DataForm" />
@@ -2390,385 +2357,6 @@
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-              <node concept="16syzq" id="4TCblo5YJyT" role="1pMfVU">
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-        </node>
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-      <node concept="16euLQ" id="4TCblo5YIIG" role="16eVyc">
-        <property role="TrG5h" value="T" />
-        <node concept="3uibUv" id="4TCblo5YJ_1" role="3ztrMU">
-          <ref role="3uigEE" to="yt73:~Term" resolve="Term" />
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-    <node concept="2tJIrI" id="677NV565VBQ" role="jymVt" />
-    <node concept="2YIFZL" id="4TCblo5NqWF" role="jymVt">
-      <property role="TrG5h" value="instantiateMetaLogicals" />
-      <property role="DiZV1" value="false" />
-      <property role="od$2w" value="false" />
-      <node concept="3clFbS" id="4TCblo5NkoL" role="3clF47">
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-            <node concept="liA8E" id="4TCblo5Nl7d" role="2OqNvi">
-              <ref role="37wK5l" to="6exd:3OPtF02TgQt" resolve="map" />
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-                <ref role="3cqZAo" node="4TCblo5NkAJ" resolve="tf" />
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-      <node concept="37vLTG" id="4TCblo5NkAJ" role="3clF46">
-        <property role="TrG5h" value="tf" />
-        <node concept="3uibUv" id="4TCblo5NkFx" role="1tU5fm">
-          <ref role="3uigEE" to="6exd:1bm7a6EXvsP" resolve="DataForm" />
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-      <node concept="37vLTG" id="4TCblo5NkwR" role="3clF46">
-        <property role="TrG5h" value="logicalContext" />
-        <node concept="3uibUv" id="4TCblo5Nk_K" role="1tU5fm">
-          <ref role="3uigEE" to="bj13:~LogicalContext" resolve="LogicalContext" />
-        </node>
-      </node>
-      <node concept="3uibUv" id="4TCblo5Nlai" role="3clF45">
-        <ref role="3uigEE" to="6exd:1bm7a6EXvsP" resolve="DataForm" />
-      </node>
-      <node concept="3Tm1VV" id="4TCblo5NkoK" role="1B3o_S" />
-    </node>
-    <node concept="2tJIrI" id="4TCblo5Nkhd" role="jymVt" />
-    <node concept="312cEu" id="4TCblo5MG7R" role="jymVt">
-      <property role="2bfB8j" value="false" />
-      <property role="1sVAO0" value="false" />
-      <property role="1EXbeo" value="false" />
-      <property role="TrG5h" value="InstantiateDelegate" />
-      <node concept="2tJIrI" id="4TCblo5MHSq" role="jymVt" />
-      <node concept="3clFbW" id="4TCblo5MHYk" role="jymVt">
-        <node concept="3cqZAl" id="4TCblo5MHYm" role="3clF45" />
-        <node concept="3Tm6S6" id="4TCblo5MHYn" role="1B3o_S" />
-        <node concept="3clFbS" id="4TCblo5MHYo" role="3clF47">
-          <node concept="3clFbF" id="4TCblo5MI7v" role="3cqZAp">
-            <node concept="37vLTI" id="4TCblo5MI7x" role="3clFbG">
-              <node concept="2OqwBi" id="4TCblo5MI7_" role="37vLTJ">
-                <node concept="Xjq3P" id="4TCblo5MI7C" role="2Oq$k0" />
-                <node concept="2OwXpG" id="4TCblo5MI7$" role="2OqNvi">
-                  <ref role="2Oxat5" node="4TCblo5MI7r" resolve="logicalContext" />
-                </node>
-              </node>
-              <node concept="37vLTw" id="4TCblo5MI7D" role="37vLTx">
-                <ref role="3cqZAo" node="4TCblo5MI32" resolve="logicalContext" />
-              </node>
-            </node>
-          </node>
-        </node>
-        <node concept="37vLTG" id="4TCblo5MI32" role="3clF46">
-          <property role="TrG5h" value="logicalContext" />
-          <node concept="3uibUv" id="4TCblo5MI31" role="1tU5fm">
-            <ref role="3uigEE" to="bj13:~LogicalContext" resolve="LogicalContext" />
-          </node>
-        </node>
-      </node>
-      <node concept="2tJIrI" id="4TCblo5MHTP" role="jymVt" />
-      <node concept="3Tm6S6" id="4TCblo5MG2k" role="1B3o_S" />
-      <node concept="3uibUv" id="4TCblo5MGIz" role="EKbjA">
-        <ref role="3uigEE" to="6exd:3OPtF031GQe" resolve="Mappers.MapDelegate" />
-      </node>
-      <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="tf" />
-          <node concept="3uibUv" id="6HT7BWBPa9K" role="1tU5fm">
-            <ref role="3uigEE" to="6exd:1bm7a6EXvsP" resolve="DataForm" />
-          </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="5BGv8yzxlPR" role="3cqZAp">
-            <node concept="3eOSWO" id="5BGv8yzxmvm" role="3clFbG">
-              <node concept="3cmrfG" id="5BGv8yzxmwO" role="3uHU7w">
-                <property role="3cmrfH" value="0" />
-              </node>
-              <node concept="2OqwBi" id="5BGv8yzxm1a" role="3uHU7B">
-                <node concept="37vLTw" id="5BGv8yzxlPP" role="2Oq$k0">
-                  <ref role="3cqZAo" node="6HT7BWBPa9J" resolve="tf" />
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-                <node concept="liA8E" id="5BGv8yzxmhs" role="2OqNvi">
-                  <ref role="37wK5l" to="6exd:5BGv8yzvvIZ" resolve="variablesCount" />
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-              </node>
-            </node>
-          </node>
-        </node>
-      </node>
-      <node concept="2tJIrI" id="4TCblo5MIEy" role="jymVt" />
-      <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="tf" />
-          <node concept="3uibUv" id="6HT7BWBPa9Q" role="1tU5fm">
-            <ref role="3uigEE" to="6exd:1bm7a6EXvsP" resolve="DataForm" />
-          </node>
-        </node>
-        <node concept="37vLTG" id="6HT7BWBPa9R" role="3clF46">
-          <property role="TrG5h" value="fallback" />
-          <node concept="3uibUv" id="6HT7BWBPa9S" role="1tU5fm">
-            <ref role="3uigEE" to="6exd:3OPtF02TdNT" resolve="DataForm.Mapper" />
-          </node>
-        </node>
-        <node concept="3Tm1VV" id="6HT7BWBPa9T" role="1B3o_S" />
-        <node concept="3uibUv" id="6HT7BWBPa9U" role="3clF45">
-          <ref role="3uigEE" to="6exd:1bm7a6EXvsP" resolve="DataForm" />
-        </node>
-        <node concept="3clFbS" id="6HT7BWBPa9V" role="3clF47">
-          <node concept="3clFbJ" id="5BGv8yzxmXQ" role="3cqZAp">
-            <node concept="3clFbS" id="5BGv8yzxmXS" role="3clFbx">
-              <node concept="3cpWs6" id="5BGv8yzxnrb" role="3cqZAp">
-                <node concept="2ShNRf" id="4TCblo5Pq8Z" role="3cqZAk">
-                  <node concept="1pGfFk" id="4TCblo5PqjT" role="2ShVmc">
-                    <ref role="37wK5l" to="oy3s:4TCblo5ML4I" resolve="LogicalDataForm" />
-                    <node concept="2OqwBi" id="4TCblo5PabD" role="37wK5m">
-                      <node concept="37vLTw" id="4TCblo5PabE" role="2Oq$k0">
-                        <ref role="3cqZAo" node="4TCblo5MI7r" resolve="logicalContext" />
-                      </node>
-                      <node concept="liA8E" id="4TCblo5PabF" role="2OqNvi">
-                        <ref role="37wK5l" to="bj13:~LogicalContext.variable(jetbrains.mps.logic.reactor.logical.MetaLogical):jetbrains.mps.logic.reactor.logical.Logical" resolve="variable" />
-                        <node concept="2OqwBi" id="4TCblo5PabG" role="37wK5m">
-                          <node concept="1eOMI4" id="4TCblo5PabH" role="2Oq$k0">
-                            <node concept="10QFUN" id="4TCblo5PabI" role="1eOMHV">
-                              <node concept="37vLTw" id="4TCblo5PabJ" role="10QFUP">
-                                <ref role="3cqZAo" node="6HT7BWBPa9P" resolve="tf" />
-                              </node>
-                              <node concept="3uibUv" id="4TCblo5PabK" role="10QFUM">
-                                <ref role="3uigEE" to="oy3s:7HUwyZbdMWH" resolve="MetaLogicalDataForm" />
-                              </node>
-                            </node>
-                          </node>
-                          <node concept="liA8E" id="4TCblo5PabL" role="2OqNvi">
-                            <ref role="37wK5l" to="oy3s:514BAS_Xsp_" resolve="metaLogical" />
-                          </node>
-                        </node>
-                      </node>
-                    </node>
-                  </node>
-                </node>
-              </node>
-              <node concept="3clFbH" id="5BGv8yzxoz$" role="3cqZAp" />
-            </node>
-            <node concept="2ZW3vV" id="4TCblo5MCk$" role="3clFbw">
-              <node concept="3uibUv" id="4TCblo5MCof" role="2ZW6by">
-                <ref role="3uigEE" to="oy3s:7HUwyZbdMWH" resolve="MetaLogicalDataForm" />
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-              <node concept="37vLTw" id="bUIfhjJCGB" role="2ZW6bz">
-                <ref role="3cqZAo" node="6HT7BWBPa9P" resolve="tf" />
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-            <node concept="9aQIb" id="5BGv8yzxoqo" role="9aQIa">
-              <node concept="3clFbS" id="5BGv8yzxoqp" role="9aQI4">
-                <node concept="3cpWs6" id="5BGv8yzxpdJ" role="3cqZAp">
-                  <node concept="2OqwBi" id="5BGv8yzxl7m" role="3cqZAk">
-                    <node concept="37vLTw" id="5BGv8yzxkWc" role="2Oq$k0">
-                      <ref role="3cqZAo" node="6HT7BWBPa9P" resolve="tf" />
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-                    <node concept="liA8E" id="5BGv8yzxlnb" role="2OqNvi">
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-                        <ref role="3cqZAo" node="6HT7BWBPa9R" resolve="fallback" />
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-      <node concept="2tJIrI" id="4TCblo5MI$W" role="jymVt" />
-      <node concept="312cEg" id="4TCblo5MI7r" role="jymVt">
-        <property role="TrG5h" value="logicalContext" />
-        <node concept="3Tm6S6" id="4TCblo5MI7s" role="1B3o_S" />
-        <node concept="3uibUv" id="4TCblo5MI7u" role="1tU5fm">
-          <ref role="3uigEE" to="bj13:~LogicalContext" resolve="LogicalContext" />
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-    <node concept="2tJIrI" id="4TCblo5NlYH" role="jymVt" />
-    <node concept="3Tm1VV" id="677NV565N1y" role="1B3o_S" />
-  </node>
   <node concept="312cEu" id="70Wv0dJhKHy">
     <property role="TrG5h" value="ProgramEx" />
     <property role="1sVAO0" value="true" />
diff --git a/coderules/languages/jetbrains.mps.logic/runtime/models/jetbrains.mps.logic.unification.mps b/coderules/languages/jetbrains.mps.logic/runtime/models/jetbrains.mps.logic.unification.mps
index 80237a3e..4e27a4e7 100644
--- a/coderules/languages/jetbrains.mps.logic/runtime/models/jetbrains.mps.logic.unification.mps
+++ b/coderules/languages/jetbrains.mps.logic/runtime/models/jetbrains.mps.logic.unification.mps
@@ -4,6 +4,7 @@
   <languages>
     <use id="83888646-71ce-4f1c-9c53-c54016f6ad4f" name="jetbrains.mps.baseLanguage.collections" version="1" />
     <use id="f2801650-65d5-424e-bb1b-463a8781b786" name="jetbrains.mps.baseLanguage.javadoc" version="2" />
+    <use id="f3061a53-9226-4cc5-a443-f952ceaf5816" name="jetbrains.mps.baseLanguage" version="8" />
     <devkit ref="fbc25dd2-5da4-483a-8b19-70928e1b62d7(jetbrains.mps.devkit.general-purpose)" />
   </languages>
   <imports>
@@ -23,12 +24,22 @@
       </concept>
       <concept id="1202948039474" name="jetbrains.mps.baseLanguage.structure.InstanceMethodCallOperation" flags="nn" index="liA8E" />
       <concept id="1465982738277781862" name="jetbrains.mps.baseLanguage.structure.PlaceholderMember" flags="ng" index="2tJIrI" />
+      <concept id="1239714755177" name="jetbrains.mps.baseLanguage.structure.AbstractUnaryNumberOperation" flags="nn" index="2$Kvd9">
+        <child id="1239714902950" name="expression" index="2$L3a6" />
+      </concept>
+      <concept id="1173175405605" name="jetbrains.mps.baseLanguage.structure.ArrayAccessExpression" flags="nn" index="AH0OO">
+        <child id="1173175577737" name="index" index="AHEQo" />
+        <child id="1173175590490" name="array" index="AHHXb" />
+      </concept>
       <concept id="1188207840427" name="jetbrains.mps.baseLanguage.structure.AnnotationInstance" flags="nn" index="2AHcQZ">
         <reference id="1188208074048" name="annotation" index="2AI5Lk" />
       </concept>
       <concept id="1188208481402" name="jetbrains.mps.baseLanguage.structure.HasAnnotation" flags="ng" index="2AJDlI">
         <child id="1188208488637" name="annotation" index="2AJF6D" />
       </concept>
+      <concept id="1154032098014" name="jetbrains.mps.baseLanguage.structure.AbstractLoopStatement" flags="nn" index="2LF5Ji">
+        <child id="1154032183016" name="body" index="2LFqv$" />
+      </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" />
@@ -40,8 +51,15 @@
         <reference id="1083260308426" name="enumConstantDeclaration" index="Rm8GQ" />
         <reference id="1144432896254" name="enumClass" index="1Px2BO" />
       </concept>
+      <concept id="1145552977093" name="jetbrains.mps.baseLanguage.structure.GenericNewExpression" flags="nn" index="2ShNRf">
+        <child id="1145553007750" name="creator" index="2ShVmc" />
+      </concept>
       <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" />
+      <concept id="1081236700938" name="jetbrains.mps.baseLanguage.structure.StaticMethodDeclaration" flags="ig" index="2YIFZL" />
+      <concept id="1081236700937" name="jetbrains.mps.baseLanguage.structure.StaticMethodCall" flags="nn" index="2YIFZM">
+        <reference id="1144433194310" name="classConcept" index="1Pybhc" />
+      </concept>
       <concept id="1081256982272" name="jetbrains.mps.baseLanguage.structure.InstanceOfExpression" flags="nn" index="2ZW3vV">
         <child id="1081256993305" name="classType" index="2ZW6by" />
         <child id="1081256993304" name="leftExpression" index="2ZW6bz" />
@@ -49,17 +67,23 @@
       <concept id="1070534058343" name="jetbrains.mps.baseLanguage.structure.NullLiteral" flags="nn" index="10Nm6u" />
       <concept id="1070534370425" name="jetbrains.mps.baseLanguage.structure.IntegerType" flags="in" index="10Oyi0" />
       <concept id="1070534644030" name="jetbrains.mps.baseLanguage.structure.BooleanType" flags="in" index="10P_77" />
+      <concept id="1070534760951" name="jetbrains.mps.baseLanguage.structure.ArrayType" flags="in" index="10Q1$e">
+        <child id="1070534760952" name="componentType" index="10Q1$1" />
+      </concept>
       <concept id="1070534934090" name="jetbrains.mps.baseLanguage.structure.CastExpression" flags="nn" index="10QFUN">
         <child id="1070534934091" name="type" index="10QFUM" />
         <child id="1070534934092" name="expression" index="10QFUP" />
       </concept>
       <concept id="1068390468200" name="jetbrains.mps.baseLanguage.structure.FieldDeclaration" flags="ig" index="312cEg" />
       <concept id="1068390468198" name="jetbrains.mps.baseLanguage.structure.ClassConcept" flags="ig" index="312cEu">
+        <property id="1075300953594" name="abstractClass" index="1sVAO0" />
+        <property id="1221565133444" name="isFinal" index="1EXbeo" />
         <child id="1095933932569" name="implementedInterface" index="EKbjA" />
         <child id="1165602531693" name="superclass" index="1zkMxy" />
       </concept>
       <concept id="1068431474542" name="jetbrains.mps.baseLanguage.structure.VariableDeclaration" flags="ng" index="33uBYm">
         <property id="1176718929932" name="isFinal" index="3TUv4t" />
+        <child id="1068431790190" name="initializer" index="33vP2m" />
       </concept>
       <concept id="1109279763828" name="jetbrains.mps.baseLanguage.structure.TypeVariableDeclaration" flags="ng" index="16euLQ">
         <child id="1214996921760" name="bound" index="3ztrMU" />
@@ -99,6 +123,7 @@
         <child id="1082485599094" name="ifFalseStatement" index="9aQIa" />
         <child id="1068580123160" name="condition" index="3clFbw" />
         <child id="1068580123161" name="ifTrue" index="3clFbx" />
+        <child id="1206060520071" name="elsifClauses" index="3eNLev" />
       </concept>
       <concept id="1068580123136" name="jetbrains.mps.baseLanguage.structure.StatementList" flags="sn" stub="5293379017992965193" index="3clFbS">
         <child id="1068581517665" name="statement" index="3cqZAp" />
@@ -114,10 +139,20 @@
       <concept id="1068581242878" name="jetbrains.mps.baseLanguage.structure.ReturnStatement" flags="nn" index="3cpWs6">
         <child id="1068581517676" name="expression" index="3cqZAk" />
       </concept>
+      <concept id="1068581242864" name="jetbrains.mps.baseLanguage.structure.LocalVariableDeclarationStatement" flags="nn" index="3cpWs8">
+        <child id="1068581242865" name="localVariableDeclaration" index="3cpWs9" />
+      </concept>
+      <concept id="1068581242863" name="jetbrains.mps.baseLanguage.structure.LocalVariableDeclaration" flags="nr" index="3cpWsn" />
       <concept id="1068581517677" name="jetbrains.mps.baseLanguage.structure.VoidType" flags="in" index="3cqZAl" />
+      <concept id="1206060495898" name="jetbrains.mps.baseLanguage.structure.ElsifClause" flags="ng" index="3eNFk2">
+        <child id="1206060619838" name="condition" index="3eO9$A" />
+        <child id="1206060644605" name="statementList" index="3eOfB_" />
+      </concept>
       <concept id="1079359253375" name="jetbrains.mps.baseLanguage.structure.ParenthesizedExpression" flags="nn" index="1eOMI4">
         <child id="1079359253376" name="expression" index="1eOMHV" />
       </concept>
+      <concept id="1081506762703" name="jetbrains.mps.baseLanguage.structure.GreaterThanExpression" flags="nn" index="3eOSWO" />
+      <concept id="1081506773034" name="jetbrains.mps.baseLanguage.structure.LessThanExpression" flags="nn" index="3eOVzh" />
       <concept id="1081516740877" name="jetbrains.mps.baseLanguage.structure.NotExpression" flags="nn" index="3fqX7Q">
         <child id="1081516765348" name="expression" index="3fr31v" />
       </concept>
@@ -125,7 +160,11 @@
         <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">
+        <child id="1212687122400" name="typeParameter" index="1pMfVU" />
+      </concept>
       <concept id="1107461130800" name="jetbrains.mps.baseLanguage.structure.Classifier" flags="ng" index="3pOWGL">
+        <property id="521412098689998745" name="nonStatic" index="2bfB8j" />
         <child id="5375687026011219971" name="member" index="jymVt" unordered="true" />
       </concept>
       <concept id="1171903607971" name="jetbrains.mps.baseLanguage.structure.WildCardType" flags="in" index="3qTvmN" />
@@ -135,6 +174,7 @@
       <concept id="7812454656619025416" name="jetbrains.mps.baseLanguage.structure.MethodDeclaration" flags="ng" index="1rXfSm">
         <property id="8355037393041754995" name="isNative" index="2aFKle" />
       </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" />
         <child id="1109201940907" name="parameter" index="11_B2D" />
@@ -143,10 +183,30 @@
         <child id="1081773367579" name="rightExpression" index="3uHU7w" />
         <child id="1081773367580" name="leftExpression" index="3uHU7B" />
       </concept>
+      <concept id="1214918800624" name="jetbrains.mps.baseLanguage.structure.PostfixIncrementExpression" flags="nn" index="3uNrnE" />
       <concept id="1073239437375" name="jetbrains.mps.baseLanguage.structure.NotEqualsExpression" flags="nn" index="3y3z36" />
+      <concept id="1184950988562" name="jetbrains.mps.baseLanguage.structure.ArrayCreator" flags="nn" index="3$_iS1">
+        <child id="1184951007469" name="componentType" index="3$_nBY" />
+        <child id="1184952969026" name="dimensionExpression" index="3$GQph" />
+      </concept>
+      <concept id="1184952934362" name="jetbrains.mps.baseLanguage.structure.DimensionExpression" flags="nn" index="3$GHV9">
+        <child id="1184953288404" name="expression" index="3$I4v7" />
+      </concept>
       <concept id="1178549954367" name="jetbrains.mps.baseLanguage.structure.IVisible" flags="ng" index="1B3ioH">
         <child id="1178549979242" name="visibility" index="1B3o_S" />
       </concept>
+      <concept id="1144230876926" name="jetbrains.mps.baseLanguage.structure.AbstractForStatement" flags="nn" index="1DupvO">
+        <child id="1144230900587" name="variable" index="1Duv9x" />
+      </concept>
+      <concept id="1144231330558" name="jetbrains.mps.baseLanguage.structure.ForStatement" flags="nn" index="1Dw8fO">
+        <child id="1144231399730" name="condition" index="1Dwp0S" />
+        <child id="1144231408325" name="iteration" index="1Dwrff" />
+      </concept>
+      <concept id="1163668896201" name="jetbrains.mps.baseLanguage.structure.TernaryOperatorExpression" flags="nn" index="3K4zz7">
+        <child id="1163668914799" name="condition" index="3K4Cdx" />
+        <child id="1163668922816" name="ifTrue" index="3K4E3e" />
+        <child id="1163668934364" name="ifFalse" index="3K4GZi" />
+      </concept>
       <concept id="6329021646629104957" name="jetbrains.mps.baseLanguage.structure.TextCommentPart" flags="nn" index="3SKdUq">
         <property id="6329021646629104958" name="text" index="3SKdUp" />
       </concept>
@@ -155,6 +215,9 @@
       </concept>
       <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="1116615150612" name="jetbrains.mps.baseLanguage.structure.ClassifierClassExpression" flags="nn" index="3VsKOn">
+        <reference id="1116615189566" name="classifier" index="3VsUkX" />
+      </concept>
     </language>
     <language id="ceab5195-25ea-4f22-9b92-103b95ca8c0c" name="jetbrains.mps.lang.core">
       <concept id="1169194658468" name="jetbrains.mps.lang.core.structure.INamedConcept" flags="ng" index="TrEIO">
@@ -171,9 +234,6 @@
       <node concept="3clFbS" id="7HUwyZbdNAh" role="3clF47">
         <node concept="XkiVB" id="7HUwyZbdOUD" role="3cqZAp">
           <ref role="37wK5l" to="6exd:uNmovXiEVu" resolve="Variable" />
-          <node concept="37vLTw" id="7HUwyZbdOWP" role="37wK5m">
-            <ref role="3cqZAo" node="7HUwyZbdNBn" resolve="metaLogical" />
-          </node>
         </node>
         <node concept="3SKdUt" id="4sSe4$pxFOq" role="3cqZAp">
           <node concept="3SKdUq" id="4sSe4$pxFOs" role="3SKWNk">
@@ -202,6 +262,24 @@
       </node>
     </node>
     <node concept="2tJIrI" id="7HUwyZbdN_E" role="jymVt" />
+    <node concept="3clFb_" id="7BhUeN7yvD4" role="jymVt">
+      <property role="TrG5h" value="symbol" />
+      <node concept="3Tm1VV" id="7BhUeN7yvD5" role="1B3o_S" />
+      <node concept="3uibUv" id="7BhUeN7yvD7" role="3clF45">
+        <ref role="3uigEE" to="wyt6:~Object" resolve="Object" />
+      </node>
+      <node concept="3clFbS" id="7BhUeN7yvDa" role="3clF47">
+        <node concept="3clFbF" id="7BhUeN7yw5v" role="3cqZAp">
+          <node concept="37vLTw" id="7BhUeN7yw5s" role="3clFbG">
+            <ref role="3cqZAo" node="7HUwyZbdNB$" resolve="metaLogical" />
+          </node>
+        </node>
+      </node>
+      <node concept="2AHcQZ" id="7BhUeN7yvDb" role="2AJF6D">
+        <ref role="2AI5Lk" to="wyt6:~Override" resolve="Override" />
+      </node>
+    </node>
+    <node concept="2tJIrI" id="7BhUeN7yw6j" role="jymVt" />
     <node concept="3clFb_" id="514BAS_Xsp_" role="jymVt">
       <property role="1EzhhJ" value="false" />
       <property role="TrG5h" value="metaLogical" />
@@ -284,6 +362,74 @@
       </node>
     </node>
     <node concept="2tJIrI" id="7HUwyZbdNCL" role="jymVt" />
+    <node concept="3clFb_" id="56MMu0Ark7v" 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="56MMu0Ark7w" role="1B3o_S" />
+      <node concept="3uibUv" id="573vQv1llVK" role="3clF45">
+        <ref role="3uigEE" to="yt73:~Term" resolve="Term" />
+      </node>
+      <node concept="3clFbS" id="56MMu0Ark7_" role="3clF47">
+        <node concept="3clFbF" id="56MMu0ArpIO" role="3cqZAp">
+          <node concept="Xjq3P" id="56MMu0ArpIN" role="3clFbG" />
+        </node>
+      </node>
+      <node concept="2AHcQZ" id="56MMu0ArpbU" role="2AJF6D">
+        <ref role="2AI5Lk" to="wyt6:~Override" resolve="Override" />
+      </node>
+    </node>
+    <node concept="2tJIrI" id="56MMu0AroSn" role="jymVt" />
+    <node concept="3clFb_" id="56MMu0Ark7C" 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="56MMu0Ark7D" role="1B3o_S" />
+      <node concept="37vLTG" id="56MMu0Ark7E" role="3clF46">
+        <property role="TrG5h" value="kind" />
+        <property role="3TUv4t" value="false" />
+        <node concept="3uibUv" id="573vQv1lmdE" role="1tU5fm">
+          <ref role="3uigEE" to="yt73:~Term$Kind" resolve="Term.Kind" />
+        </node>
+      </node>
+      <node concept="10P_77" id="56MMu0Ark7H" role="3clF45" />
+      <node concept="3clFbS" id="56MMu0Ark7K" role="3clF47">
+        <node concept="3clFbF" id="56MMu0ArqpV" role="3cqZAp">
+          <node concept="3clFbC" id="56MMu0ArqJ4" role="3clFbG">
+            <node concept="Rm8GO" id="18cJbc0HVY6" role="3uHU7B">
+              <ref role="1Px2BO" to="yt73:~Term$Kind" resolve="Term.Kind" />
+              <ref role="Rm8GQ" to="yt73:~Term$Kind.VAR" resolve="VAR" />
+            </node>
+            <node concept="37vLTw" id="56MMu0ArqYY" role="3uHU7w">
+              <ref role="3cqZAo" node="56MMu0Ark7E" resolve="kind" />
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="2AHcQZ" id="56MMu0ArrcS" role="2AJF6D">
+        <ref role="2AI5Lk" to="wyt6:~Override" resolve="Override" />
+      </node>
+    </node>
+    <node concept="2tJIrI" id="3gNap3ffGmS" role="jymVt" />
+    <node concept="3clFb_" id="5BGv8yzwV99" role="jymVt">
+      <property role="1EzhhJ" value="false" />
+      <property role="TrG5h" value="variablesCount" />
+      <node concept="10Oyi0" id="5BGv8yzwV9a" role="3clF45" />
+      <node concept="3Tm1VV" id="5BGv8yzwV9b" role="1B3o_S" />
+      <node concept="3clFbS" id="5BGv8yzwV9d" role="3clF47">
+        <node concept="3clFbF" id="5BGv8yzwXsr" role="3cqZAp">
+          <node concept="3cmrfG" id="5BGv8yzwXsq" role="3clFbG">
+            <property role="3cmrfH" value="1" />
+          </node>
+        </node>
+      </node>
+      <node concept="2AHcQZ" id="3gNap3ffGir" role="2AJF6D">
+        <ref role="2AI5Lk" to="wyt6:~Override" resolve="Override" />
+      </node>
+    </node>
+    <node concept="2tJIrI" id="3gNap3ffG7C" role="jymVt" />
     <node concept="3clFb_" id="4sSe4$psaDX" role="jymVt">
       <property role="1EzhhJ" value="false" />
       <property role="TrG5h" value="toString" />
@@ -306,6 +452,105 @@
         </node>
       </node>
     </node>
+    <node concept="2tJIrI" id="3gNap3fNdDZ" role="jymVt" />
+    <node concept="3clFb_" id="3gNap3ffK1R" role="jymVt">
+      <property role="1EzhhJ" value="false" />
+      <property role="TrG5h" value="hashCode" />
+      <property role="DiZV1" value="false" />
+      <node concept="3Tm1VV" id="3gNap3ffK1S" role="1B3o_S" />
+      <node concept="10Oyi0" id="3gNap3ffK1T" role="3clF45" />
+      <node concept="2AHcQZ" id="3gNap3ffK1U" role="2AJF6D">
+        <ref role="2AI5Lk" to="wyt6:~Override" resolve="Override" />
+      </node>
+      <node concept="3clFbS" id="3gNap3ffK1V" role="3clF47">
+        <node concept="3clFbF" id="3gNap3ffK1W" role="3cqZAp">
+          <node concept="3cpWs3" id="3gNap3ffK1X" role="3clFbG">
+            <node concept="3cmrfG" id="3gNap3ffK1Y" role="3uHU7w">
+              <property role="3cmrfH" value="37" />
+            </node>
+            <node concept="17qRlL" id="3gNap3ffK1Z" role="3uHU7B">
+              <node concept="2OqwBi" id="3gNap3ffK20" role="3uHU7B">
+                <node concept="37vLTw" id="3gNap3ffRxc" role="2Oq$k0">
+                  <ref role="3cqZAo" node="7HUwyZbdNB$" resolve="metaLogical" />
+                </node>
+                <node concept="liA8E" id="3gNap3ffK22" role="2OqNvi">
+                  <ref role="37wK5l" to="wyt6:~Object.hashCode():int" resolve="hashCode" />
+                </node>
+              </node>
+              <node concept="3cmrfG" id="3gNap3ffK23" role="3uHU7w">
+                <property role="3cmrfH" value="19" />
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+    </node>
+    <node concept="2tJIrI" id="3gNap3ffK24" role="jymVt" />
+    <node concept="3clFb_" id="3gNap3ffK25" role="jymVt">
+      <property role="1EzhhJ" value="false" />
+      <property role="TrG5h" value="equals" />
+      <property role="DiZV1" value="false" />
+      <node concept="3Tm1VV" id="3gNap3ffK26" role="1B3o_S" />
+      <node concept="10P_77" id="3gNap3ffK27" role="3clF45" />
+      <node concept="37vLTG" id="3gNap3ffK28" role="3clF46">
+        <property role="TrG5h" value="that" />
+        <node concept="3uibUv" id="3gNap3ffK29" role="1tU5fm">
+          <ref role="3uigEE" to="wyt6:~Object" resolve="Object" />
+        </node>
+      </node>
+      <node concept="2AHcQZ" id="3gNap3ffK2a" role="2AJF6D">
+        <ref role="2AI5Lk" to="wyt6:~Override" resolve="Override" />
+      </node>
+      <node concept="3clFbS" id="3gNap3ffK2b" role="3clF47">
+        <node concept="3clFbJ" id="3gNap3ffK2c" role="3cqZAp">
+          <node concept="3clFbS" id="3gNap3ffK2d" role="3clFbx">
+            <node concept="3cpWs6" id="3gNap3ffK2e" role="3cqZAp">
+              <node concept="3clFbT" id="3gNap3ffK2f" role="3cqZAk">
+                <property role="3clFbU" value="false" />
+              </node>
+            </node>
+          </node>
+          <node concept="3fqX7Q" id="3gNap3ffK2g" role="3clFbw">
+            <node concept="2ZW3vV" id="3gNap3ffK2h" role="3fr31v">
+              <node concept="3uibUv" id="3gNap3ffKYO" role="2ZW6by">
+                <ref role="3uigEE" node="7HUwyZbdMWH" resolve="MetaLogicalDataForm" />
+              </node>
+              <node concept="37vLTw" id="3gNap3ffK2j" role="2ZW6bz">
+                <ref role="3cqZAo" node="3gNap3ffK28" resolve="that" />
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="3clFbF" id="3gNap3ffK2k" role="3cqZAp">
+          <node concept="2OqwBi" id="3gNap3ffK2l" role="3clFbG">
+            <node concept="2OqwBi" id="3gNap3ffK2m" role="2Oq$k0">
+              <node concept="Xjq3P" id="3gNap3ffK2n" role="2Oq$k0" />
+              <node concept="2OwXpG" id="3gNap3ffTyO" role="2OqNvi">
+                <ref role="2Oxat5" node="7HUwyZbdNB$" resolve="metaLogical" />
+              </node>
+            </node>
+            <node concept="liA8E" id="3gNap3ffK2p" role="2OqNvi">
+              <ref role="37wK5l" to="wyt6:~Object.equals(java.lang.Object):boolean" resolve="equals" />
+              <node concept="2OqwBi" id="3gNap3ffK2q" role="37wK5m">
+                <node concept="1eOMI4" id="3gNap3ffK2r" role="2Oq$k0">
+                  <node concept="10QFUN" id="3gNap3ffK2s" role="1eOMHV">
+                    <node concept="37vLTw" id="3gNap3ffK2t" role="10QFUP">
+                      <ref role="3cqZAo" node="3gNap3ffK28" resolve="that" />
+                    </node>
+                    <node concept="3uibUv" id="3gNap3ffKYR" role="10QFUM">
+                      <ref role="3uigEE" node="7HUwyZbdMWH" resolve="MetaLogicalDataForm" />
+                    </node>
+                  </node>
+                </node>
+                <node concept="2OwXpG" id="3gNap3ffLkV" role="2OqNvi">
+                  <ref role="2Oxat5" node="7HUwyZbdNB$" resolve="metaLogical" />
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+    </node>
     <node concept="2tJIrI" id="4sSe4$psb5H" role="jymVt" />
     <node concept="3Tm1VV" id="7HUwyZbdMWI" role="1B3o_S" />
     <node concept="3uibUv" id="7HUwyZbdN_j" role="1zkMxy">
@@ -348,9 +593,6 @@
       <node concept="3clFbS" id="4TCblo5ML4M" role="3clF47">
         <node concept="XkiVB" id="4TCblo5MOl_" role="3cqZAp">
           <ref role="37wK5l" to="6exd:uNmovXiEVu" resolve="Variable" />
-          <node concept="37vLTw" id="4TCblo5MOwN" role="37wK5m">
-            <ref role="3cqZAo" node="4TCblo5MNMf" resolve="logical" />
-          </node>
         </node>
         <node concept="3SKdUt" id="4sSe4$pxIbF" role="3cqZAp">
           <node concept="3SKdUq" id="4sSe4$pxIbH" role="3SKWNk">
@@ -373,6 +615,113 @@
       </node>
     </node>
     <node concept="2tJIrI" id="4TCblo5MPIA" role="jymVt" />
+    <node concept="3clFb_" id="7BhUeN7yuQZ" role="jymVt">
+      <property role="TrG5h" value="symbol" />
+      <node concept="3Tm1VV" id="7BhUeN7yuR0" role="1B3o_S" />
+      <node concept="3uibUv" id="7BhUeN7yuR2" role="3clF45">
+        <ref role="3uigEE" to="wyt6:~Object" resolve="Object" />
+      </node>
+      <node concept="3clFbS" id="7BhUeN7yuR5" role="3clF47">
+        <node concept="3clFbF" id="7BhUeN7yvv0" role="3cqZAp">
+          <node concept="37vLTw" id="7BhUeN7yvuX" role="3clFbG">
+            <ref role="3cqZAo" node="4TCblo5MOOn" resolve="logical" />
+          </node>
+        </node>
+      </node>
+      <node concept="2AHcQZ" id="7BhUeN7yuR6" role="2AJF6D">
+        <ref role="2AI5Lk" to="wyt6:~Override" resolve="Override" />
+      </node>
+    </node>
+    <node concept="2tJIrI" id="7BhUeN7yvvO" role="jymVt" />
+    <node concept="3clFb_" id="4TCblo5MSCA" role="jymVt">
+      <property role="TrG5h" value="isWildcard" />
+      <property role="1EzhhJ" value="false" />
+      <node concept="10P_77" id="4TCblo5MSCB" role="3clF45" />
+      <node concept="3Tm1VV" id="4TCblo5MSCC" role="1B3o_S" />
+      <node concept="3clFbS" id="4TCblo5MSCG" role="3clF47">
+        <node concept="3clFbF" id="4TCblo5MULK" role="3cqZAp">
+          <node concept="2OqwBi" id="4TCblo5MUU0" role="3clFbG">
+            <node concept="37vLTw" id="4TCblo5MULJ" role="2Oq$k0">
+              <ref role="3cqZAo" node="4TCblo5MOOn" resolve="logical" />
+            </node>
+            <node concept="liA8E" id="4TCblo5MV1e" role="2OqNvi">
+              <ref role="37wK5l" to="bj13:~Logical.isWildcard():boolean" resolve="isWildcard" />
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="2AHcQZ" id="4TCblo5MSCH" role="2AJF6D">
+        <ref role="2AI5Lk" to="wyt6:~Override" resolve="Override" />
+      </node>
+    </node>
+    <node concept="2tJIrI" id="3gNap3ffFBE" role="jymVt" />
+    <node concept="3clFb_" id="4TCblo5MWaC" role="jymVt">
+      <property role="TrG5h" value="canRepresent" />
+      <property role="1EzhhJ" value="false" />
+      <node concept="37vLTG" id="4TCblo5MWaD" role="3clF46">
+        <property role="TrG5h" value="klass" />
+        <node concept="3uibUv" id="4TCblo5MWaE" role="1tU5fm">
+          <ref role="3uigEE" to="wyt6:~Class" resolve="Class" />
+          <node concept="3qUE_q" id="4TCblo5MWaF" role="11_B2D">
+            <node concept="3uibUv" id="4TCblo5MWaG" role="3qUE_r">
+              <ref role="3uigEE" to="6exd:1bm7a6EXvsP" resolve="DataForm" />
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="10P_77" id="4TCblo5MWaH" role="3clF45" />
+      <node concept="3Tm1VV" id="4TCblo5MWaI" role="1B3o_S" />
+      <node concept="3clFbS" id="4TCblo5MWaM" role="3clF47">
+        <node concept="3clFbJ" id="4TCblo5PbR3" role="3cqZAp">
+          <node concept="3y3z36" id="4TCblo5PgbW" role="3clFbw">
+            <node concept="10Nm6u" id="4TCblo5Pgg9" role="3uHU7w" />
+            <node concept="2OqwBi" id="4TCblo5PfKR" role="3uHU7B">
+              <node concept="37vLTw" id="4TCblo5Pf_R" role="2Oq$k0">
+                <ref role="3cqZAo" node="4TCblo5MOOn" resolve="logical" />
+              </node>
+              <node concept="liA8E" id="4TCblo5PfRq" role="2OqNvi">
+                <ref role="37wK5l" to="bj13:~Logical.metaLogical():jetbrains.mps.logic.reactor.logical.MetaLogical" resolve="metaLogical" />
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbS" id="4TCblo5Pf7P" role="3clFbx">
+            <node concept="3cpWs6" id="4TCblo5PgQh" role="3cqZAp">
+              <node concept="2OqwBi" id="6OUp3PsSGSl" role="3cqZAk">
+                <node concept="2OqwBi" id="4TCblo5PiAX" role="2Oq$k0">
+                  <node concept="2OqwBi" id="4TCblo5PhFQ" role="2Oq$k0">
+                    <node concept="37vLTw" id="4TCblo5Phlx" role="2Oq$k0">
+                      <ref role="3cqZAo" node="4TCblo5MOOn" resolve="logical" />
+                    </node>
+                    <node concept="liA8E" id="4TCblo5Pi8Z" role="2OqNvi">
+                      <ref role="37wK5l" to="bj13:~Logical.metaLogical():jetbrains.mps.logic.reactor.logical.MetaLogical" resolve="metaLogical" />
+                    </node>
+                  </node>
+                  <node concept="liA8E" id="4TCblo5Pj6t" role="2OqNvi">
+                    <ref role="37wK5l" to="bj13:~MetaLogical.type():java.lang.Class" resolve="type" />
+                  </node>
+                </node>
+                <node concept="liA8E" id="6OUp3PsSHqC" role="2OqNvi">
+                  <ref role="37wK5l" to="wyt6:~Object.equals(java.lang.Object):boolean" resolve="equals" />
+                  <node concept="37vLTw" id="6OUp3PsSJNn" role="37wK5m">
+                    <ref role="3cqZAo" node="4TCblo5MWaD" resolve="klass" />
+                  </node>
+                </node>
+              </node>
+            </node>
+            <node concept="3clFbH" id="4TCblo5PlEX" role="3cqZAp" />
+          </node>
+        </node>
+        <node concept="3clFbF" id="4TCblo5PmcG" role="3cqZAp">
+          <node concept="3clFbT" id="4TCblo5PmcF" role="3clFbG">
+            <property role="3clFbU" value="true" />
+          </node>
+        </node>
+      </node>
+      <node concept="2AHcQZ" id="4TCblo5MWaN" role="2AJF6D">
+        <ref role="2AI5Lk" to="wyt6:~Override" resolve="Override" />
+      </node>
+    </node>
+    <node concept="2tJIrI" id="4TCblo5MKxC" role="jymVt" />
     <node concept="3clFb_" id="4TCblo5MPLt" role="jymVt">
       <property role="1EzhhJ" value="false" />
       <property role="TrG5h" value="get" />
@@ -484,6 +833,35 @@
       </node>
     </node>
     <node concept="2tJIrI" id="4TCblo5MQH_" role="jymVt" />
+    <node concept="3clFb_" id="3gNap3ffGqZ" role="jymVt">
+      <property role="TrG5h" value="variablesCount" />
+      <node concept="10Oyi0" id="3gNap3ffGr0" role="3clF45" />
+      <node concept="3Tm1VV" id="3gNap3ffGr1" role="1B3o_S" />
+      <node concept="3clFbS" id="3gNap3ffGr7" role="3clF47">
+        <node concept="3clFbF" id="3gNap3ffGxZ" role="3cqZAp">
+          <node concept="3K4zz7" id="3gNap3ffJX1" role="3clFbG">
+            <node concept="3cmrfG" id="3gNap3ffJXT" role="3K4E3e">
+              <property role="3cmrfH" value="0" />
+            </node>
+            <node concept="3cmrfG" id="3gNap3ffJYA" role="3K4GZi">
+              <property role="3cmrfH" value="1" />
+            </node>
+            <node concept="2OqwBi" id="3gNap3ffHfe" role="3K4Cdx">
+              <node concept="37vLTw" id="3gNap3ffGxY" role="2Oq$k0">
+                <ref role="3cqZAo" node="4TCblo5MOOn" resolve="logical" />
+              </node>
+              <node concept="liA8E" id="3gNap3ffJAC" role="2OqNvi">
+                <ref role="37wK5l" to="bj13:~Logical.isBound():boolean" resolve="isBound" />
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="2AHcQZ" id="3gNap3ffGr8" role="2AJF6D">
+        <ref role="2AI5Lk" to="wyt6:~Override" resolve="Override" />
+      </node>
+    </node>
+    <node concept="2tJIrI" id="3gNap3ffGtS" role="jymVt" />
     <node concept="3clFb_" id="4TCblo5MS1o" role="jymVt">
       <property role="1EzhhJ" value="false" />
       <property role="TrG5h" value="logical" />
@@ -500,96 +878,7 @@
         </node>
       </node>
     </node>
-    <node concept="2tJIrI" id="4TCblo5MQDY" role="jymVt" />
-    <node concept="3clFb_" id="4TCblo5MSCA" role="jymVt">
-      <property role="TrG5h" value="isWildcard" />
-      <property role="1EzhhJ" value="false" />
-      <node concept="10P_77" id="4TCblo5MSCB" role="3clF45" />
-      <node concept="3Tm1VV" id="4TCblo5MSCC" role="1B3o_S" />
-      <node concept="3clFbS" id="4TCblo5MSCG" role="3clF47">
-        <node concept="3clFbF" id="4TCblo5MULK" role="3cqZAp">
-          <node concept="2OqwBi" id="4TCblo5MUU0" role="3clFbG">
-            <node concept="37vLTw" id="4TCblo5MULJ" role="2Oq$k0">
-              <ref role="3cqZAo" node="4TCblo5MOOn" resolve="logical" />
-            </node>
-            <node concept="liA8E" id="4TCblo5MV1e" role="2OqNvi">
-              <ref role="37wK5l" to="bj13:~Logical.isWildcard():boolean" resolve="isWildcard" />
-            </node>
-          </node>
-        </node>
-      </node>
-      <node concept="2AHcQZ" id="4TCblo5MSCH" role="2AJF6D">
-        <ref role="2AI5Lk" to="wyt6:~Override" resolve="Override" />
-      </node>
-    </node>
     <node concept="2tJIrI" id="4TCblo5MW14" role="jymVt" />
-    <node concept="3clFb_" id="4TCblo5MWaC" role="jymVt">
-      <property role="TrG5h" value="canRepresent" />
-      <property role="1EzhhJ" value="false" />
-      <node concept="37vLTG" id="4TCblo5MWaD" role="3clF46">
-        <property role="TrG5h" value="klass" />
-        <node concept="3uibUv" id="4TCblo5MWaE" role="1tU5fm">
-          <ref role="3uigEE" to="wyt6:~Class" resolve="Class" />
-          <node concept="3qUE_q" id="4TCblo5MWaF" role="11_B2D">
-            <node concept="3uibUv" id="4TCblo5MWaG" role="3qUE_r">
-              <ref role="3uigEE" to="6exd:1bm7a6EXvsP" resolve="DataForm" />
-            </node>
-          </node>
-        </node>
-      </node>
-      <node concept="10P_77" id="4TCblo5MWaH" role="3clF45" />
-      <node concept="3Tm1VV" id="4TCblo5MWaI" role="1B3o_S" />
-      <node concept="3clFbS" id="4TCblo5MWaM" role="3clF47">
-        <node concept="3clFbJ" id="4TCblo5PbR3" role="3cqZAp">
-          <node concept="3y3z36" id="4TCblo5PgbW" role="3clFbw">
-            <node concept="10Nm6u" id="4TCblo5Pgg9" role="3uHU7w" />
-            <node concept="2OqwBi" id="4TCblo5PfKR" role="3uHU7B">
-              <node concept="37vLTw" id="4TCblo5Pf_R" role="2Oq$k0">
-                <ref role="3cqZAo" node="4TCblo5MOOn" resolve="logical" />
-              </node>
-              <node concept="liA8E" id="4TCblo5PfRq" role="2OqNvi">
-                <ref role="37wK5l" to="bj13:~Logical.metaLogical():jetbrains.mps.logic.reactor.logical.MetaLogical" resolve="metaLogical" />
-              </node>
-            </node>
-          </node>
-          <node concept="3clFbS" id="4TCblo5Pf7P" role="3clFbx">
-            <node concept="3cpWs6" id="4TCblo5PgQh" role="3cqZAp">
-              <node concept="2OqwBi" id="6OUp3PsSGSl" role="3cqZAk">
-                <node concept="2OqwBi" id="4TCblo5PiAX" role="2Oq$k0">
-                  <node concept="2OqwBi" id="4TCblo5PhFQ" role="2Oq$k0">
-                    <node concept="37vLTw" id="4TCblo5Phlx" role="2Oq$k0">
-                      <ref role="3cqZAo" node="4TCblo5MOOn" resolve="logical" />
-                    </node>
-                    <node concept="liA8E" id="4TCblo5Pi8Z" role="2OqNvi">
-                      <ref role="37wK5l" to="bj13:~Logical.metaLogical():jetbrains.mps.logic.reactor.logical.MetaLogical" resolve="metaLogical" />
-                    </node>
-                  </node>
-                  <node concept="liA8E" id="4TCblo5Pj6t" role="2OqNvi">
-                    <ref role="37wK5l" to="bj13:~MetaLogical.type():java.lang.Class" resolve="type" />
-                  </node>
-                </node>
-                <node concept="liA8E" id="6OUp3PsSHqC" role="2OqNvi">
-                  <ref role="37wK5l" to="wyt6:~Object.equals(java.lang.Object):boolean" resolve="equals" />
-                  <node concept="37vLTw" id="6OUp3PsSJNn" role="37wK5m">
-                    <ref role="3cqZAo" node="4TCblo5MWaD" resolve="klass" />
-                  </node>
-                </node>
-              </node>
-            </node>
-            <node concept="3clFbH" id="4TCblo5PlEX" role="3cqZAp" />
-          </node>
-        </node>
-        <node concept="3clFbF" id="4TCblo5PmcG" role="3cqZAp">
-          <node concept="3clFbT" id="4TCblo5PmcF" role="3clFbG">
-            <property role="3clFbU" value="true" />
-          </node>
-        </node>
-      </node>
-      <node concept="2AHcQZ" id="4TCblo5MWaN" role="2AJF6D">
-        <ref role="2AI5Lk" to="wyt6:~Override" resolve="Override" />
-      </node>
-    </node>
-    <node concept="2tJIrI" id="4TCblo5MKxC" role="jymVt" />
     <node concept="3clFb_" id="4TCblo5MYmA" role="jymVt">
       <property role="1EzhhJ" value="false" />
       <property role="TrG5h" value="toString" />
@@ -725,131 +1014,1257 @@
       </node>
     </node>
   </node>
-  <node concept="312cEu" id="4xTpErjR15$">
-    <property role="TrG5h" value="DefaultLogicalUnification" />
-    <node concept="2tJIrI" id="4xTpErjR1ns" role="jymVt" />
-    <node concept="3clFb_" id="3FIATxbQg$x" role="jymVt">
-      <property role="1EzhhJ" value="false" />
-      <property role="TrG5h" value="asRoot" />
-      <node concept="37vLTG" id="3FIATxbQg$y" role="3clF46">
-        <property role="TrG5h" value="term" />
-        <node concept="16syzq" id="3FIATxbQg$z" role="1tU5fm">
-          <ref role="16sUi3" node="3FIATxbQg$A" resolve="TERM" />
+  <node concept="312cEu" id="3gNap3fN2hw">
+    <property role="TrG5h" value="LogicalValue" />
+    <node concept="2tJIrI" id="3gNap3fN2hF" role="jymVt" />
+    <node concept="312cEg" id="3gNap3fN2iq" role="jymVt">
+      <property role="TrG5h" value="logical" />
+      <node concept="3Tm6S6" id="3gNap3fN2ir" role="1B3o_S" />
+      <node concept="3uibUv" id="3gNap3fN2is" role="1tU5fm">
+        <ref role="3uigEE" to="bj13:~Logical" resolve="Logical" />
+        <node concept="16syzq" id="3gNap3fNgUX" role="11_B2D">
+          <ref role="16sUi3" node="3gNap3fN2hD" resolve="V" />
         </node>
       </node>
-      <node concept="16syzq" id="3FIATxbQg$$" role="3clF45">
-        <ref role="16sUi3" node="3FIATxbQg$A" resolve="TERM" />
-      </node>
-      <node concept="3Tm1VV" id="3FIATxbQg$_" role="1B3o_S" />
-      <node concept="16euLQ" id="3FIATxbQg$A" role="16eVyc">
-        <property role="TrG5h" value="TERM" />
-        <node concept="3uibUv" id="3FIATxbQg$B" role="3ztrMU">
-          <ref role="3uigEE" to="yt73:~Term" resolve="Term" />
+    </node>
+    <node concept="2tJIrI" id="3gNap3fN2iu" role="jymVt" />
+    <node concept="3clFbW" id="3gNap3fN2iv" role="jymVt">
+      <node concept="37vLTG" id="3gNap3fN2iw" role="3clF46">
+        <property role="TrG5h" value="logical" />
+        <node concept="3uibUv" id="3gNap3fN2ix" role="1tU5fm">
+          <ref role="3uigEE" to="bj13:~Logical" resolve="Logical" />
+          <node concept="16syzq" id="3gNap3fNgV0" role="11_B2D">
+            <ref role="16sUi3" node="3gNap3fN2hD" resolve="V" />
+          </node>
         </node>
       </node>
-      <node concept="3clFbS" id="3FIATxbQg$C" role="3clF47">
-        <node concept="3clFbF" id="3FIATxbQg$D" role="3cqZAp">
-          <node concept="10QFUN" id="3FIATxbQg$E" role="3clFbG">
-            <node concept="2OqwBi" id="3FIATxbQg$F" role="10QFUP">
-              <node concept="1eOMI4" id="3FIATxbQg$G" role="2Oq$k0">
-                <node concept="10QFUN" id="3FIATxbQg$H" role="1eOMHV">
-                  <node concept="37vLTw" id="3FIATxbQg$I" role="10QFUP">
-                    <ref role="3cqZAo" node="3FIATxbQg$y" resolve="term" />
-                  </node>
-                  <node concept="3uibUv" id="3FIATxbQg$J" role="10QFUM">
-                    <ref role="3uigEE" to="6exd:1bm7a6EXvsP" resolve="DataForm" />
-                  </node>
-                </node>
-              </node>
-              <node concept="liA8E" id="3FIATxbQg$K" role="2OqNvi">
-                <ref role="37wK5l" to="6exd:2QE4RCGndD7" resolve="asRoot" />
-              </node>
+      <node concept="3cqZAl" id="3gNap3fN2iz" role="3clF45" />
+      <node concept="3Tm1VV" id="3gNap3fN2i$" role="1B3o_S" />
+      <node concept="3clFbS" id="3gNap3fN2i_" role="3clF47">
+        <node concept="XkiVB" id="3gNap3fN2iA" role="3cqZAp">
+          <ref role="37wK5l" to="6exd:uNmovXiEVu" resolve="Variable" />
+        </node>
+        <node concept="3SKdUt" id="3gNap3fN2iC" role="3cqZAp">
+          <node concept="3SKdUq" id="3gNap3fN2iD" role="3SKWNk">
+            <property role="3SKdUp" value="TODO: superfluous field" />
+          </node>
+        </node>
+        <node concept="3clFbF" id="3gNap3fN2iE" role="3cqZAp">
+          <node concept="37vLTI" id="3gNap3fN2iF" role="3clFbG">
+            <node concept="37vLTw" id="3gNap3fN2iG" role="37vLTx">
+              <ref role="3cqZAo" node="3gNap3fN2iw" resolve="logical" />
             </node>
-            <node concept="16syzq" id="3FIATxbQg$L" role="10QFUM">
-              <ref role="16sUi3" node="3FIATxbQg$A" resolve="TERM" />
+            <node concept="2OqwBi" id="3gNap3fN2iH" role="37vLTJ">
+              <node concept="Xjq3P" id="3gNap3fN2iI" role="2Oq$k0" />
+              <node concept="2OwXpG" id="3gNap3fN2iJ" role="2OqNvi">
+                <ref role="2Oxat5" node="3gNap3fN2iq" resolve="logical" />
+              </node>
             </node>
           </node>
         </node>
       </node>
     </node>
-    <node concept="2tJIrI" id="3FIATxbQg$M" role="jymVt" />
-    <node concept="3clFb_" id="3FIATxbQg$N" role="jymVt">
+    <node concept="2tJIrI" id="3gNap3fN2ik" role="jymVt" />
+    <node concept="3clFb_" id="7BhUeN7ywU1" role="jymVt">
+      <property role="TrG5h" value="symbol" />
+      <node concept="3Tm1VV" id="7BhUeN7ywU2" role="1B3o_S" />
+      <node concept="3uibUv" id="7BhUeN7ywU4" role="3clF45">
+        <ref role="3uigEE" to="wyt6:~Object" resolve="Object" />
+      </node>
+      <node concept="3clFbS" id="7BhUeN7ywU7" role="3clF47">
+        <node concept="3clFbJ" id="7BhUeN7yx2e" role="3cqZAp">
+          <node concept="2OqwBi" id="7BhUeN7yxE5" role="3clFbw">
+            <node concept="37vLTw" id="7BhUeN7yx4w" role="2Oq$k0">
+              <ref role="3cqZAo" node="3gNap3fN2iq" resolve="logical" />
+            </node>
+            <node concept="liA8E" id="7BhUeN7y$2Z" role="2OqNvi">
+              <ref role="37wK5l" to="bj13:~Logical.isBound():boolean" resolve="isBound" />
+            </node>
+          </node>
+          <node concept="3clFbS" id="7BhUeN7yx2g" role="3clFbx">
+            <node concept="3cpWs6" id="7BhUeN7y$4w" role="3cqZAp">
+              <node concept="2OqwBi" id="7BhUeN7yAUO" role="3cqZAk">
+                <node concept="2OqwBi" id="7BhUeN7y$lJ" role="2Oq$k0">
+                  <node concept="37vLTw" id="7BhUeN7y$aS" role="2Oq$k0">
+                    <ref role="3cqZAo" node="3gNap3fN2iq" resolve="logical" />
+                  </node>
+                  <node concept="liA8E" id="7BhUeN7yAJo" role="2OqNvi">
+                    <ref role="37wK5l" to="bj13:~Logical.findRoot():jetbrains.mps.logic.reactor.logical.Logical" resolve="findRoot" />
+                  </node>
+                </node>
+                <node concept="liA8E" id="7BhUeN7yB7W" role="2OqNvi">
+                  <ref role="37wK5l" to="bj13:~Logical.value():java.lang.Object" resolve="value" />
+                </node>
+              </node>
+            </node>
+            <node concept="3clFbH" id="7BhUeN7yBfC" role="3cqZAp" />
+          </node>
+          <node concept="9aQIb" id="7BhUeN7yBaf" role="9aQIa">
+            <node concept="3clFbS" id="7BhUeN7yBag" role="9aQI4">
+              <node concept="3cpWs6" id="7BhUeN7yBbL" role="3cqZAp">
+                <node concept="37vLTw" id="7BhUeN7yBeP" role="3cqZAk">
+                  <ref role="3cqZAo" node="3gNap3fN2iq" resolve="logical" />
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="2AHcQZ" id="7BhUeN7ywU8" role="2AJF6D">
+        <ref role="2AI5Lk" to="wyt6:~Override" resolve="Override" />
+      </node>
+    </node>
+    <node concept="2tJIrI" id="7BhUeN7ywXu" role="jymVt" />
+    <node concept="3clFb_" id="3gNap3fN2jR" role="jymVt">
+      <property role="TrG5h" value="isWildcard" />
+      <property role="1EzhhJ" value="false" />
+      <node concept="10P_77" id="3gNap3fN2jS" role="3clF45" />
+      <node concept="3Tm1VV" id="3gNap3fN2jT" role="1B3o_S" />
+      <node concept="3clFbS" id="3gNap3fN2jU" role="3clF47">
+        <node concept="3clFbF" id="3gNap3fN2jV" role="3cqZAp">
+          <node concept="2OqwBi" id="3gNap3fN2jW" role="3clFbG">
+            <node concept="37vLTw" id="3gNap3fN2jX" role="2Oq$k0">
+              <ref role="3cqZAo" node="3gNap3fN2iq" resolve="logical" />
+            </node>
+            <node concept="liA8E" id="3gNap3fN2jY" role="2OqNvi">
+              <ref role="37wK5l" to="bj13:~Logical.isWildcard():boolean" resolve="isWildcard" />
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="2AHcQZ" id="3gNap3fN2jZ" role="2AJF6D">
+        <ref role="2AI5Lk" to="wyt6:~Override" resolve="Override" />
+      </node>
+    </node>
+    <node concept="2tJIrI" id="3gNap3fN2jq" role="jymVt" />
+    <node concept="3clFb_" id="3gNap3fN2m3" role="jymVt">
+      <property role="TrG5h" value="canRepresent" />
+      <property role="1EzhhJ" value="false" />
+      <node concept="37vLTG" id="3gNap3fN2m4" role="3clF46">
+        <property role="TrG5h" value="klass" />
+        <node concept="3uibUv" id="3gNap3fN2m5" role="1tU5fm">
+          <ref role="3uigEE" to="wyt6:~Class" resolve="Class" />
+          <node concept="3qUE_q" id="3gNap3fN2m6" role="11_B2D">
+            <node concept="3uibUv" id="3gNap3fN2m7" role="3qUE_r">
+              <ref role="3uigEE" to="6exd:1bm7a6EXvsP" resolve="DataForm" />
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="10P_77" id="3gNap3fN2m8" role="3clF45" />
+      <node concept="3Tm1VV" id="3gNap3fN2m9" role="1B3o_S" />
+      <node concept="3clFbS" id="3gNap3fN2ma" role="3clF47">
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+              <ref role="3VsUkX" to="6exd:2xQ7eRAD2dj" resolve="Value" />
+            </node>
+            <node concept="liA8E" id="3gNap3fN3Rf" role="2OqNvi">
+              <ref role="37wK5l" to="wyt6:~Object.equals(java.lang.Object):boolean" resolve="equals" />
+              <node concept="37vLTw" id="3gNap3fN3SA" role="37wK5m">
+                <ref role="3cqZAo" node="3gNap3fN2m4" resolve="klass" />
+              </node>
+            </node>
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+        </node>
+      </node>
+      <node concept="2AHcQZ" id="3gNap3fN2mu" role="2AJF6D">
+        <ref role="2AI5Lk" to="wyt6:~Override" resolve="Override" />
+      </node>
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+    <node concept="2tJIrI" id="3gNap3fN2lr" role="jymVt" />
+    <node concept="3clFb_" id="3gNap3fN3XS" 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="3gNap3fN3XT" role="1B3o_S" />
+      <node concept="3uibUv" id="3gNap3fN3XU" role="3clF45">
+        <ref role="3uigEE" to="yt73:~Term" resolve="Term" />
+      </node>
+      <node concept="2AHcQZ" id="3gNap3fN3XV" role="2AJF6D">
+        <ref role="2AI5Lk" to="wyt6:~Override" resolve="Override" />
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+      <node concept="3clFbS" id="3gNap3fN3XW" role="3clF47">
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+          <node concept="Xjq3P" id="3gNap3fN40B" role="3clFbG" />
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+    <node concept="3clFb_" id="3gNap3fN41F" role="jymVt">
+      <property role="1EzhhJ" value="false" />
+      <property role="TrG5h" value="is" />
+      <property role="DiZV1" value="false" />
+      <property role="od$2w" value="false" />
+      <node concept="3Tm1VV" id="3gNap3fN41G" role="1B3o_S" />
+      <node concept="37vLTG" id="3gNap3fN41H" role="3clF46">
+        <property role="TrG5h" value="kind" />
+        <property role="3TUv4t" value="false" />
+        <node concept="3uibUv" id="3gNap3fN41I" role="1tU5fm">
+          <ref role="3uigEE" to="yt73:~Term$Kind" resolve="Term.Kind" />
+        </node>
+      </node>
+      <node concept="10P_77" id="3gNap3fN41J" role="3clF45" />
+      <node concept="3clFbS" id="3gNap3fN41K" role="3clF47">
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+          <node concept="3clFbS" id="7BhUeN7yiJM" role="3clFbx">
+            <node concept="3cpWs6" id="7BhUeN7ylNV" role="3cqZAp">
+              <node concept="3clFbC" id="7BhUeN7ylNW" role="3cqZAk">
+                <node concept="37vLTw" id="7BhUeN7ylNX" role="3uHU7w">
+                  <ref role="3cqZAo" node="3gNap3fN41H" resolve="kind" />
+                </node>
+                <node concept="Rm8GO" id="7BhUeN7ylTM" role="3uHU7B">
+                  <ref role="Rm8GQ" to="yt73:~Term$Kind.FUN" resolve="FUN" />
+                  <ref role="1Px2BO" to="yt73:~Term$Kind" resolve="Term.Kind" />
+                </node>
+              </node>
+            </node>
+            <node concept="3clFbH" id="7BhUeN7yiJL" role="3cqZAp" />
+          </node>
+          <node concept="2OqwBi" id="7BhUeN7yjqW" role="3clFbw">
+            <node concept="37vLTw" id="7BhUeN7yiND" role="2Oq$k0">
+              <ref role="3cqZAo" node="3gNap3fN2iq" resolve="logical" />
+            </node>
+            <node concept="liA8E" id="7BhUeN7ylN8" role="2OqNvi">
+              <ref role="37wK5l" to="bj13:~Logical.isBound():boolean" resolve="isBound" />
+            </node>
+          </node>
+          <node concept="9aQIb" id="7BhUeN7ylX0" role="9aQIa">
+            <node concept="3clFbS" id="7BhUeN7ylX1" role="9aQI4">
+              <node concept="3cpWs6" id="3gNap3fN41X" role="3cqZAp">
+                <node concept="3clFbC" id="3gNap3fN41Y" role="3cqZAk">
+                  <node concept="37vLTw" id="3gNap3fN41Z" role="3uHU7w">
+                    <ref role="3cqZAo" node="3gNap3fN41H" resolve="kind" />
+                  </node>
+                  <node concept="Rm8GO" id="3gNap3fN420" role="3uHU7B">
+                    <ref role="1Px2BO" to="yt73:~Term$Kind" resolve="Term.Kind" />
+                    <ref role="Rm8GQ" to="yt73:~Term$Kind.VAR" resolve="VAR" />
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="2AHcQZ" id="3gNap3fN421" role="2AJF6D">
+        <ref role="2AI5Lk" to="wyt6:~Override" resolve="Override" />
+      </node>
+    </node>
+    <node concept="2tJIrI" id="3gNap3fN422" role="jymVt" />
+    <node concept="3clFb_" id="3gNap3fN7MZ" role="jymVt">
+      <property role="TrG5h" value="variablesCount" />
+      <node concept="10Oyi0" id="3gNap3fN7N0" role="3clF45" />
+      <node concept="3Tm1VV" id="3gNap3fN7N1" role="1B3o_S" />
+      <node concept="3clFbS" id="3gNap3fN7N2" role="3clF47">
+        <node concept="3clFbF" id="7BhUeN7ym2E" role="3cqZAp">
+          <node concept="3K4zz7" id="7BhUeN7ypMH" role="3clFbG">
+            <node concept="3cmrfG" id="7BhUeN7ypOo" role="3K4E3e">
+              <property role="3cmrfH" value="0" />
+            </node>
+            <node concept="3cmrfG" id="7BhUeN7ypPS" role="3K4GZi">
+              <property role="3cmrfH" value="1" />
+            </node>
+            <node concept="2OqwBi" id="7BhUeN7ymdU" role="3K4Cdx">
+              <node concept="37vLTw" id="7BhUeN7ym2C" role="2Oq$k0">
+                <ref role="3cqZAo" node="3gNap3fN2iq" resolve="logical" />
+              </node>
+              <node concept="liA8E" id="7BhUeN7yoA4" role="2OqNvi">
+                <ref role="37wK5l" to="bj13:~Logical.isBound():boolean" resolve="isBound" />
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="2AHcQZ" id="3gNap3fN7Na" role="2AJF6D">
+        <ref role="2AI5Lk" to="wyt6:~Override" resolve="Override" />
+      </node>
+    </node>
+    <node concept="2tJIrI" id="3gNap3fN7P0" role="jymVt" />
+    <node concept="3clFb_" id="3gNap3fN7SD" role="jymVt">
       <property role="1EzhhJ" value="false" />
       <property role="TrG5h" value="logical" />
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-        <property role="TrG5h" value="var" />
-        <node concept="16syzq" id="3FIATxbQg$P" role="1tU5fm">
-          <ref role="16sUi3" node="3FIATxbQg$T" resolve="TERM" />
+      <node concept="3uibUv" id="3gNap3fN7SE" role="3clF45">
+        <ref role="3uigEE" to="bj13:~Logical" resolve="Logical" />
+        <node concept="3qTvmN" id="3gNap3fN7SF" role="11_B2D" />
+      </node>
+      <node concept="3Tm1VV" id="3gNap3fN7SG" role="1B3o_S" />
+      <node concept="3clFbS" id="3gNap3fN7SH" role="3clF47">
+        <node concept="3clFbF" id="3gNap3fN7SI" role="3cqZAp">
+          <node concept="37vLTw" id="3gNap3fN7SJ" role="3clFbG">
+            <ref role="3cqZAo" node="3gNap3fN2iq" resolve="logical" />
+          </node>
         </node>
       </node>
-      <node concept="3uibUv" id="3FIATxbQg$Q" role="3clF45">
-        <ref role="3uigEE" to="bj13:~JoinableLogical" resolve="JoinableLogical" />
-        <node concept="16syzq" id="3FIATxbQg$R" role="11_B2D">
-          <ref role="16sUi3" node="3FIATxbQg$T" resolve="TERM" />
+    </node>
+    <node concept="2tJIrI" id="3gNap3fN7SK" role="jymVt" />
+    <node concept="3clFb_" id="3gNap3fN7WJ" role="jymVt">
+      <property role="1EzhhJ" value="false" />
+      <property role="TrG5h" value="toString" />
+      <property role="DiZV1" value="false" />
+      <node concept="3Tm1VV" id="3gNap3fN7WK" role="1B3o_S" />
+      <node concept="17QB3L" id="3gNap3fN7WL" role="3clF45" />
+      <node concept="2AHcQZ" id="3gNap3fN7WM" role="2AJF6D">
+        <ref role="2AI5Lk" to="wyt6:~Override" resolve="Override" />
+      </node>
+      <node concept="3clFbS" id="3gNap3fN7WN" role="3clF47">
+        <node concept="3clFbF" id="3gNap3fN7WO" role="3cqZAp">
+          <node concept="2OqwBi" id="3gNap3fN7WP" role="3clFbG">
+            <node concept="37vLTw" id="3gNap3fN7WQ" role="2Oq$k0">
+              <ref role="3cqZAo" node="3gNap3fN2iq" resolve="logical" />
+            </node>
+            <node concept="liA8E" id="3gNap3fN7WR" role="2OqNvi">
+              <ref role="37wK5l" to="wyt6:~Object.toString():java.lang.String" resolve="toString" />
+            </node>
+          </node>
         </node>
       </node>
-      <node concept="3Tm1VV" id="3FIATxbQg$S" role="1B3o_S" />
-      <node concept="16euLQ" id="3FIATxbQg$T" role="16eVyc">
-        <property role="TrG5h" value="TERM" />
-        <node concept="3uibUv" id="3FIATxbQg$U" role="3ztrMU">
-          <ref role="3uigEE" to="yt73:~Term" resolve="Term" />
+    </node>
+    <node concept="2tJIrI" id="3gNap3fN7WS" role="jymVt" />
+    <node concept="3clFb_" id="3gNap3fN7WT" role="jymVt">
+      <property role="1EzhhJ" value="false" />
+      <property role="TrG5h" value="hashCode" />
+      <property role="DiZV1" value="false" />
+      <node concept="3Tm1VV" id="3gNap3fN7WU" role="1B3o_S" />
+      <node concept="10Oyi0" id="3gNap3fN7WV" role="3clF45" />
+      <node concept="2AHcQZ" id="3gNap3fN7WW" role="2AJF6D">
+        <ref role="2AI5Lk" to="wyt6:~Override" resolve="Override" />
+      </node>
+      <node concept="3clFbS" id="3gNap3fN7WX" role="3clF47">
+        <node concept="3clFbF" id="3gNap3fN7WY" role="3cqZAp">
+          <node concept="3cpWs3" id="3gNap3fN7WZ" role="3clFbG">
+            <node concept="3cmrfG" id="3gNap3fN7X0" role="3uHU7w">
+              <property role="3cmrfH" value="41" />
+            </node>
+            <node concept="17qRlL" id="3gNap3fN7X1" role="3uHU7B">
+              <node concept="2OqwBi" id="3gNap3fN7X2" role="3uHU7B">
+                <node concept="37vLTw" id="3gNap3fN7X3" role="2Oq$k0">
+                  <ref role="3cqZAo" node="3gNap3fN2iq" resolve="logical" />
+                </node>
+                <node concept="liA8E" id="3gNap3fN7X4" role="2OqNvi">
+                  <ref role="37wK5l" to="wyt6:~Object.hashCode():int" resolve="hashCode" />
+                </node>
+              </node>
+              <node concept="3cmrfG" id="3gNap3fN7X5" role="3uHU7w">
+                <property role="3cmrfH" value="23" />
+              </node>
+            </node>
+          </node>
         </node>
       </node>
-      <node concept="3clFbS" id="3FIATxbQg$V" role="3clF47">
-        <node concept="3clFbF" id="3FIATxbQg$W" role="3cqZAp">
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-                  <node concept="37vLTw" id="3FIATxbQg_1" role="10QFUP">
-                    <ref role="3cqZAo" node="3FIATxbQg$O" resolve="var" />
+    </node>
+    <node concept="2tJIrI" id="3gNap3fN7X6" role="jymVt" />
+    <node concept="3clFb_" id="3gNap3fN7X7" role="jymVt">
+      <property role="1EzhhJ" value="false" />
+      <property role="TrG5h" value="equals" />
+      <property role="DiZV1" value="false" />
+      <node concept="3Tm1VV" id="3gNap3fN7X8" role="1B3o_S" />
+      <node concept="10P_77" id="3gNap3fN7X9" role="3clF45" />
+      <node concept="37vLTG" id="3gNap3fN7Xa" role="3clF46">
+        <property role="TrG5h" value="that" />
+        <node concept="3uibUv" id="3gNap3fN7Xb" role="1tU5fm">
+          <ref role="3uigEE" to="wyt6:~Object" resolve="Object" />
+        </node>
+      </node>
+      <node concept="2AHcQZ" id="3gNap3fN7Xc" role="2AJF6D">
+        <ref role="2AI5Lk" to="wyt6:~Override" resolve="Override" />
+      </node>
+      <node concept="3clFbS" id="3gNap3fN7Xd" role="3clF47">
+        <node concept="3clFbJ" id="3gNap3fN7Xe" role="3cqZAp">
+          <node concept="3clFbS" id="3gNap3fN7Xf" role="3clFbx">
+            <node concept="3cpWs6" id="3gNap3fN7Xg" role="3cqZAp">
+              <node concept="3clFbT" id="3gNap3fN7Xh" role="3cqZAk">
+                <property role="3clFbU" value="false" />
+              </node>
+            </node>
+          </node>
+          <node concept="3fqX7Q" id="3gNap3fN7Xi" role="3clFbw">
+            <node concept="2ZW3vV" id="3gNap3fN7Xj" role="3fr31v">
+              <node concept="3uibUv" id="3gNap3fNblE" role="2ZW6by">
+                <ref role="3uigEE" node="3gNap3fN2hw" resolve="LogicalValue" />
+              </node>
+              <node concept="37vLTw" id="3gNap3fN7Xl" role="2ZW6bz">
+                <ref role="3cqZAo" node="3gNap3fN7Xa" resolve="that" />
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="3clFbF" id="3gNap3fN7Xm" role="3cqZAp">
+          <node concept="2OqwBi" id="3gNap3fN7Xn" role="3clFbG">
+            <node concept="2OqwBi" id="3gNap3fN7Xo" role="2Oq$k0">
+              <node concept="Xjq3P" id="3gNap3fN7Xp" role="2Oq$k0" />
+              <node concept="2OwXpG" id="3gNap3fNafY" role="2OqNvi">
+                <ref role="2Oxat5" node="3gNap3fN2iq" resolve="logical" />
+              </node>
+            </node>
+            <node concept="liA8E" id="3gNap3fN7Xr" role="2OqNvi">
+              <ref role="37wK5l" to="wyt6:~Object.equals(java.lang.Object):boolean" resolve="equals" />
+              <node concept="2OqwBi" id="3gNap3fN7Xs" role="37wK5m">
+                <node concept="1eOMI4" id="3gNap3fN7Xt" role="2Oq$k0">
+                  <node concept="10QFUN" id="3gNap3fN7Xu" role="1eOMHV">
+                    <node concept="37vLTw" id="3gNap3fN7Xv" role="10QFUP">
+                      <ref role="3cqZAo" node="3gNap3fN7Xa" resolve="that" />
+                    </node>
+                    <node concept="3uibUv" id="3gNap3fNblH" role="10QFUM">
+                      <ref role="3uigEE" node="3gNap3fN2hw" resolve="LogicalValue" />
+                    </node>
                   </node>
-                  <node concept="3uibUv" id="3FIATxbQg_2" role="10QFUM">
-                    <ref role="3uigEE" to="bj13:~LogicalOwner" resolve="LogicalOwner" />
+                </node>
+                <node concept="2OwXpG" id="3gNap3fNbE_" role="2OqNvi">
+                  <ref role="2Oxat5" node="3gNap3fN2iq" resolve="logical" />
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+    </node>
+    <node concept="2tJIrI" id="3gNap3fN2hT" role="jymVt" />
+    <node concept="3Tm1VV" id="3gNap3fN2hx" role="1B3o_S" />
+    <node concept="3uibUv" id="3gNap3fN2hA" role="1zkMxy">
+      <ref role="3uigEE" to="6exd:uNmovXiEd4" resolve="Variable" />
+    </node>
+    <node concept="16euLQ" id="3gNap3fN2hD" role="16eVyc">
+      <property role="TrG5h" value="V" />
+    </node>
+  </node>
+  <node concept="312cEu" id="3gNap3fNdtK">
+    <property role="TrG5h" value="MetaLogicalValue" />
+    <node concept="2tJIrI" id="3gNap3fNdyj" role="jymVt" />
+    <node concept="3clFbW" id="3gNap3fNdxx" role="jymVt">
+      <node concept="3cqZAl" id="3gNap3fNdxy" role="3clF45" />
+      <node concept="3Tm1VV" id="3gNap3fNdxz" role="1B3o_S" />
+      <node concept="3clFbS" id="3gNap3fNdx$" role="3clF47">
+        <node concept="XkiVB" id="3gNap3fNdx_" role="3cqZAp">
+          <ref role="37wK5l" to="6exd:uNmovXiEVu" resolve="Variable" />
+        </node>
+        <node concept="3SKdUt" id="3gNap3fNdxB" role="3cqZAp">
+          <node concept="3SKdUq" id="3gNap3fNdxC" role="3SKWNk">
+            <property role="3SKdUp" value="TODO: superfluous field" />
+          </node>
+        </node>
+        <node concept="3clFbF" id="3gNap3fNdxD" role="3cqZAp">
+          <node concept="37vLTI" id="3gNap3fNdxE" role="3clFbG">
+            <node concept="2OqwBi" id="3gNap3fNdxF" role="37vLTJ">
+              <node concept="Xjq3P" id="3gNap3fNdxG" role="2Oq$k0" />
+              <node concept="2OwXpG" id="3gNap3fNjY7" role="2OqNvi">
+                <ref role="2Oxat5" node="3gNap3fNdyC" resolve="metaLogical" />
+              </node>
+            </node>
+            <node concept="37vLTw" id="3gNap3fNdxI" role="37vLTx">
+              <ref role="3cqZAo" node="3gNap3fNdxJ" resolve="metaLogical" />
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="37vLTG" id="3gNap3fNdxJ" role="3clF46">
+        <property role="TrG5h" value="metaLogical" />
+        <node concept="3uibUv" id="3gNap3fNdxK" role="1tU5fm">
+          <ref role="3uigEE" to="bj13:~MetaLogical" resolve="MetaLogical" />
+          <node concept="16syzq" id="3gNap3fNgV9" role="11_B2D">
+            <ref role="16sUi3" node="3gNap3fNgV4" resolve="V" />
+          </node>
+        </node>
+      </node>
+    </node>
+    <node concept="2tJIrI" id="3gNap3fNdxo" role="jymVt" />
+    <node concept="3clFb_" id="7BhUeN7ywbP" role="jymVt">
+      <property role="TrG5h" value="symbol" />
+      <node concept="3Tm1VV" id="7BhUeN7ywbQ" role="1B3o_S" />
+      <node concept="3uibUv" id="7BhUeN7ywbS" role="3clF45">
+        <ref role="3uigEE" to="wyt6:~Object" resolve="Object" />
+      </node>
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+                  <ref role="3uigEE" node="3gNap3fNdtK" resolve="MetaLogicalValue" />
+                </node>
+                <node concept="37vLTw" id="3gNap3fZbPl" role="2ZW6bz">
+                  <ref role="3cqZAo" node="6HT7BWBPa9P" resolve="tf" />
+                </node>
+              </node>
+              <node concept="3clFbS" id="3gNap3fZbO_" role="3eOfB_">
+                <node concept="3cpWs6" id="3gNap3fZcV5" role="3cqZAp">
+                  <node concept="1rXfSq" id="3gNap3fZcZq" role="3cqZAk">
+                    <ref role="37wK5l" node="3gNap3fZcVn" resolve="asValue" />
+                    <node concept="2OqwBi" id="3gNap3fZcZt" role="37wK5m">
+                      <node concept="37vLTw" id="3gNap3fZcZu" role="2Oq$k0">
+                        <ref role="3cqZAo" node="4TCblo5MI7r" resolve="logicalContext" />
+                      </node>
+                      <node concept="liA8E" id="3gNap3fZcZv" role="2OqNvi">
+                        <ref role="37wK5l" to="bj13:~LogicalContext.variable(jetbrains.mps.logic.reactor.logical.MetaLogical):jetbrains.mps.logic.reactor.logical.Logical" resolve="variable" />
+                        <node concept="2OqwBi" id="3gNap3fZcZw" role="37wK5m">
+                          <node concept="1eOMI4" id="3gNap3fZcZx" role="2Oq$k0">
+                            <node concept="10QFUN" id="3gNap3fZcZy" role="1eOMHV">
+                              <node concept="37vLTw" id="3gNap3fZcZz" role="10QFUP">
+                                <ref role="3cqZAo" node="6HT7BWBPa9P" resolve="tf" />
+                              </node>
+                              <node concept="3uibUv" id="3gNap3fZcZ$" role="10QFUM">
+                                <ref role="3uigEE" node="3gNap3fNdtK" resolve="MetaLogicalValue" />
+                              </node>
+                            </node>
+                          </node>
+                          <node concept="liA8E" id="3gNap3fZcZ_" role="2OqNvi">
+                            <ref role="37wK5l" node="3gNap3fNd$z" resolve="metaLogical" />
+                          </node>
+                        </node>
+                      </node>
+                    </node>
+                  </node>
+                </node>
+                <node concept="3clFbH" id="3gNap3fZcIL" role="3cqZAp" />
+              </node>
+            </node>
+            <node concept="3clFbS" id="5BGv8yzxmXS" role="3clFbx">
+              <node concept="3cpWs6" id="3gNap3fZcTi" role="3cqZAp">
+                <node concept="1rXfSq" id="3gNap3fZcU4" role="3cqZAk">
+                  <ref role="37wK5l" node="4TCblo5YI1H" resolve="asVariable" />
+                  <node concept="2OqwBi" id="3gNap3fZcU7" role="37wK5m">
+                    <node concept="37vLTw" id="3gNap3fZcU8" role="2Oq$k0">
+                      <ref role="3cqZAo" node="4TCblo5MI7r" resolve="logicalContext" />
+                    </node>
+                    <node concept="liA8E" id="3gNap3fZcU9" role="2OqNvi">
+                      <ref role="37wK5l" to="bj13:~LogicalContext.variable(jetbrains.mps.logic.reactor.logical.MetaLogical):jetbrains.mps.logic.reactor.logical.Logical" resolve="variable" />
+                      <node concept="2OqwBi" id="3gNap3fZcUa" role="37wK5m">
+                        <node concept="1eOMI4" id="3gNap3fZcUb" role="2Oq$k0">
+                          <node concept="10QFUN" id="3gNap3fZcUc" role="1eOMHV">
+                            <node concept="37vLTw" id="3gNap3fZcUd" role="10QFUP">
+                              <ref role="3cqZAo" node="6HT7BWBPa9P" resolve="tf" />
+                            </node>
+                            <node concept="3uibUv" id="3gNap3fZcUe" role="10QFUM">
+                              <ref role="3uigEE" node="7HUwyZbdMWH" resolve="MetaLogicalDataForm" />
+                            </node>
+                          </node>
+                        </node>
+                        <node concept="liA8E" id="3gNap3fZcUf" role="2OqNvi">
+                          <ref role="37wK5l" node="514BAS_Xsp_" resolve="metaLogical" />
+                        </node>
+                      </node>
+                    </node>
+                  </node>
+                </node>
+              </node>
+              <node concept="3clFbH" id="5BGv8yzxoz$" role="3cqZAp" />
+            </node>
+            <node concept="2ZW3vV" id="4TCblo5MCk$" role="3clFbw">
+              <node concept="3uibUv" id="4TCblo5MCof" role="2ZW6by">
+                <ref role="3uigEE" node="7HUwyZbdMWH" resolve="MetaLogicalDataForm" />
+              </node>
+              <node concept="37vLTw" id="bUIfhjJCGB" role="2ZW6bz">
+                <ref role="3cqZAo" node="6HT7BWBPa9P" resolve="tf" />
+              </node>
+            </node>
+            <node concept="9aQIb" id="5BGv8yzxoqo" role="9aQIa">
+              <node concept="3clFbS" id="5BGv8yzxoqp" role="9aQI4">
+                <node concept="3cpWs6" id="5BGv8yzxpdJ" role="3cqZAp">
+                  <node concept="2OqwBi" id="5BGv8yzxl7m" role="3cqZAk">
+                    <node concept="37vLTw" id="5BGv8yzxkWc" role="2Oq$k0">
+                      <ref role="3cqZAo" node="6HT7BWBPa9P" resolve="tf" />
+                    </node>
+                    <node concept="liA8E" id="5BGv8yzxlnb" role="2OqNvi">
+                      <ref role="37wK5l" to="6exd:3OPtF02Tjpr" resolve="mapRecursively" />
+                      <node concept="37vLTw" id="5BGv8yzxlyp" role="37wK5m">
+                        <ref role="3cqZAo" node="6HT7BWBPa9R" resolve="fallback" />
+                      </node>
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="2tJIrI" id="4TCblo5MI$W" role="jymVt" />
+      <node concept="312cEg" id="4TCblo5MI7r" role="jymVt">
+        <property role="TrG5h" value="logicalContext" />
+        <node concept="3Tm6S6" id="4TCblo5MI7s" role="1B3o_S" />
+        <node concept="3uibUv" id="4TCblo5MI7u" role="1tU5fm">
+          <ref role="3uigEE" to="bj13:~LogicalContext" resolve="LogicalContext" />
+        </node>
+      </node>
+    </node>
+    <node concept="2tJIrI" id="4TCblo5NlYH" role="jymVt" />
+    <node concept="3Tm1VV" id="677NV565N1y" role="1B3o_S" />
   </node>
 </model>
 
diff --git a/coderules/solutions/jetbrains.mps.coderules.ui/models/plugin.mps b/coderules/solutions/jetbrains.mps.coderules.ui/models/plugin.mps
index 3e92f93b..e4eecbba 100644
--- a/coderules/solutions/jetbrains.mps.coderules.ui/models/plugin.mps
+++ b/coderules/solutions/jetbrains.mps.coderules.ui/models/plugin.mps
@@ -7837,13 +7837,13 @@
                       <node concept="3clFbS" id="19wqdqOqxsh" role="3clFbx">
                         <node concept="3SKdUt" id="19wqdqOqxsi" role="3cqZAp">
                           <node concept="3SKdUq" id="19wqdqOqxsj" role="3SKWNk">
-                            <property role="3SKdUp" value="FIXME: there should be a clear contract for instances of TreeForm that wrap logicals" />
+                            <property role="3SKdUp" value="FIXME: there should be a clear contract for instances of DataForm that wrap logicals" />
                           </node>
                         </node>
                         <node concept="3cpWs6" id="19wqdqOqxsk" role="3cqZAp">
                           <node concept="2ZW3vV" id="19wqdqOqxsl" role="3cqZAk">
-                            <node concept="3uibUv" id="19wqdqOqxsm" role="2ZW6by">
-                              <ref role="3uigEE" to="bj13:~LogicalOwner" resolve="LogicalOwner" />
+                            <node concept="3uibUv" id="3gNap3frqGV" role="2ZW6by">
+                              <ref role="3uigEE" to="oy3s:4TCblo5MJ1m" resolve="LogicalDataForm" />
                             </node>
                             <node concept="37vLTw" id="19wqdqOqxsn" role="2ZW6bz">
                               <ref role="3cqZAo" node="19wqdqOqxsb" resolve="tf" />
@@ -7913,8 +7913,11 @@
                                     <node concept="37vLTw" id="19wqdqOqxsN" role="10QFUP">
                                       <ref role="3cqZAo" node="19wqdqOqxsw" resolve="tf" />
                                     </node>
-                                    <node concept="3uibUv" id="19wqdqOqxsO" role="10QFUM">
-                                      <ref role="3uigEE" to="bj13:~LogicalOwner" resolve="LogicalOwner" />
+                                    <node concept="3uibUv" id="3gNap3frrmL" role="10QFUM">
+                                      <ref role="3uigEE" to="oy3s:4TCblo5MJ1m" resolve="LogicalDataForm" />
+                                      <node concept="3uibUv" id="3gNap3frrQb" role="11_B2D">
+                                        <ref role="3uigEE" to="6exd:1bm7a6EXvsP" resolve="DataForm" />
+                                      </node>
                                     </node>
                                   </node>
                                 </node>
@@ -7941,8 +7944,8 @@
                         <node concept="3clFbH" id="19wqdqOqxsV" role="3cqZAp" />
                       </node>
                       <node concept="2ZW3vV" id="19wqdqOqxsW" role="3clFbw">
-                        <node concept="3uibUv" id="19wqdqOqxsX" role="2ZW6by">
-                          <ref role="3uigEE" to="bj13:~LogicalOwner" resolve="LogicalOwner" />
+                        <node concept="3uibUv" id="3gNap3frr1Q" role="2ZW6by">
+                          <ref role="3uigEE" to="oy3s:4TCblo5MJ1m" resolve="LogicalDataForm" />
                         </node>
                         <node concept="37vLTw" id="19wqdqOqxsY" role="2ZW6bz">
                           <ref role="3cqZAo" node="19wqdqOqxsw" resolve="tf" />
diff --git a/coderules/solutions/jetbrains.mps.logic.test/models/jetbrains/mps/logic/test/unification.mps b/coderules/solutions/jetbrains.mps.logic.test/models/jetbrains/mps/logic/test/unification.mps
index fe73052d..177b31bc 100644
--- a/coderules/solutions/jetbrains.mps.logic.test/models/jetbrains/mps/logic/test/unification.mps
+++ b/coderules/solutions/jetbrains.mps.logic.test/models/jetbrains/mps/logic/test/unification.mps
@@ -48,7 +48,6 @@
       </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" />
       <concept id="1081236700938" name="jetbrains.mps.baseLanguage.structure.StaticMethodDeclaration" flags="ig" index="2YIFZL" />
       <concept id="1081236700937" name="jetbrains.mps.baseLanguage.structure.StaticMethodCall" flags="nn" index="2YIFZM">
         <reference id="1144433194310" name="classConcept" index="1Pybhc" />
@@ -700,25 +699,6 @@
     <property role="2bfB8j" value="false" />
     <property role="TrG5h" value="TestingUnificationSolver" />
     <node concept="2tJIrI" id="6yEjedm5WFP" role="jymVt" />
-    <node concept="3clFbW" id="6yEjedm5WI7" role="jymVt">
-      <node concept="37vLTG" id="3FIATxbQcKV" role="3clF46">
-        <property role="TrG5h" value="logicalUnification" />
-        <node concept="3uibUv" id="5cDlfXsLvq0" role="1tU5fm">
-          <ref role="3uigEE" to="oy3s:4xTpErjR15$" resolve="DefaultLogicalUnification" />
-        </node>
-      </node>
-      <node concept="3cqZAl" id="6yEjedm5WI9" role="3clF45" />
-      <node concept="3Tm1VV" id="6yEjedm5WIa" role="1B3o_S" />
-      <node concept="3clFbS" id="6yEjedm5WIb" role="3clF47">
-        <node concept="XkiVB" id="6yEjedm5WNa" role="3cqZAp">
-          <ref role="37wK5l" to="cxk7:5p8T3QHGKJ7" resolve="UnificationPredicate.UnificationSolver" />
-          <node concept="37vLTw" id="6yEjedm5WTt" role="37wK5m">
-            <ref role="3cqZAo" node="3FIATxbQcKV" resolve="logicalUnification" />
-          </node>
-        </node>
-      </node>
-    </node>
-    <node concept="2tJIrI" id="6yEjedm5XCT" role="jymVt" />
     <node concept="3clFb_" id="6yEjedm5XWy" role="jymVt">
       <property role="TrG5h" value="askUni" />
       <node concept="10P_77" id="6yEjedm5ZZz" role="3clF45" />
diff --git a/coderules/solutions/jetbrains.mps.logic.test/models/jetbrains/mps/logic/test/unification@tests.mps b/coderules/solutions/jetbrains.mps.logic.test/models/jetbrains/mps/logic/test/unification@tests.mps
index 94d0a999..38359693 100644
--- a/coderules/solutions/jetbrains.mps.logic.test/models/jetbrains/mps/logic/test/unification@tests.mps
+++ b/coderules/solutions/jetbrains.mps.logic.test/models/jetbrains/mps/logic/test/unification@tests.mps
@@ -248,8 +248,44 @@
       </node>
     </node>
     <node concept="2tJIrI" id="21Zu7ABuukF" role="jymVt" />
+    <node concept="3clFb_" id="3gNap3g8EL6" role="jymVt">
+      <property role="TrG5h" value="stringvar" />
+      <node concept="37vLTG" id="3gNap3g8EL7" role="3clF46">
+        <property role="TrG5h" value="name" />
+        <node concept="17QB3L" id="3gNap3g8EL8" role="1tU5fm" />
+      </node>
+      <node concept="3uibUv" id="3gNap3g8EL9" role="3clF45">
+        <ref role="3uigEE" to="6exd:uNmovXiEd4" resolve="Variable" />
+      </node>
+      <node concept="3Tm6S6" id="3gNap3g8ELa" role="1B3o_S" />
+      <node concept="3clFbS" id="3gNap3g8ELb" role="3clF47">
+        <node concept="3clFbF" id="21Zu7ABuuuo" role="3cqZAp">
+          <node concept="2YIFZM" id="3gNap3g8ENo" role="3clFbG">
+            <ref role="37wK5l" to="oy3s:3gNap3fZcVn" resolve="asValue" />
+            <ref role="1Pybhc" to="oy3s:677NV565N1x" resolve="LogicalUtil" />
+            <node concept="2ShNRf" id="3gNap3g8ENp" role="37wK5m">
+              <node concept="1pGfFk" id="3gNap3g8ENq" role="2ShVmc">
+                <ref role="37wK5l" to="zx3l:~LogicalImpl.&lt;init&gt;(jetbrains.mps.logic.reactor.logical.MetaLogical)" resolve="LogicalImpl" />
+                <node concept="2ShNRf" id="3gNap3g8ENr" role="37wK5m">
+                  <node concept="1pGfFk" id="3gNap3g8ENs" role="2ShVmc">
+                    <ref role="37wK5l" to="bj13:~MetaLogical.&lt;init&gt;(java.lang.String,java.lang.Class)" resolve="MetaLogical" />
+                    <node concept="37vLTw" id="3gNap3g8ENt" role="37wK5m">
+                      <ref role="3cqZAo" node="21Zu7ABuute" resolve="name" />
+                    </node>
+                    <node concept="3VsKOn" id="3gNap3g8ENu" role="37wK5m">
+                      <ref role="3VsUkX" to="wyt6:~String" resolve="String" />
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+    </node>
+    <node concept="2tJIrI" id="3gNap3g8EMh" role="jymVt" />
     <node concept="3clFb_" id="21Zu7ABuubV" role="jymVt">
-      <property role="TrG5h" value="var" />
+      <property role="TrG5h" value="termvar" />
       <node concept="37vLTG" id="21Zu7ABuute" role="3clF46">
         <property role="TrG5h" value="name" />
         <node concept="17QB3L" id="21Zu7ABuutu" role="1tU5fm" />
@@ -259,31 +295,26 @@
       </node>
       <node concept="3Tm6S6" id="1OShD0IfwAc" role="1B3o_S" />
       <node concept="3clFbS" id="21Zu7ABuubZ" role="3clF47">
-        <node concept="3clFbF" id="21Zu7ABuuuo" role="3cqZAp">
-          <node concept="10QFUN" id="1OShD0I14HQ" role="3clFbG">
-            <node concept="2YIFZM" id="74q$MmRB2bj" role="10QFUP">
-              <ref role="37wK5l" to="7n8k:4TCblo5YI1H" resolve="asVariable" />
-              <ref role="1Pybhc" to="7n8k:677NV565N1x" resolve="LogicalUtil" />
-              <node concept="2ShNRf" id="6yEjedm5rGN" role="37wK5m">
-                <node concept="1pGfFk" id="6yEjedm5sqz" role="2ShVmc">
-                  <ref role="37wK5l" to="zx3l:~LogicalImpl.&lt;init&gt;(jetbrains.mps.logic.reactor.logical.MetaLogical)" resolve="LogicalImpl" />
-                  <node concept="2ShNRf" id="6yEjedm5tUz" role="37wK5m">
-                    <node concept="1pGfFk" id="6yEjedm5tU$" role="2ShVmc">
-                      <ref role="37wK5l" to="bj13:~MetaLogical.&lt;init&gt;(java.lang.String,java.lang.Class)" resolve="MetaLogical" />
-                      <node concept="37vLTw" id="6yEjedm5vce" role="37wK5m">
-                        <ref role="3cqZAo" node="21Zu7ABuute" resolve="name" />
-                      </node>
-                      <node concept="3VsKOn" id="6yEjedm5tU_" role="37wK5m">
-                        <ref role="3VsUkX" to="6exd:5JQSuNswOXL" resolve="TermNode" />
-                      </node>
+        <node concept="3clFbF" id="3gNap3g8ELc" role="3cqZAp">
+          <node concept="2YIFZM" id="3gNap3g8ELd" role="3clFbG">
+            <ref role="37wK5l" to="oy3s:4TCblo5YI1H" resolve="asVariable" />
+            <ref role="1Pybhc" to="oy3s:677NV565N1x" resolve="LogicalUtil" />
+            <node concept="2ShNRf" id="3gNap3g8ELe" role="37wK5m">
+              <node concept="1pGfFk" id="3gNap3g8ELf" role="2ShVmc">
+                <ref role="37wK5l" to="zx3l:~LogicalImpl.&lt;init&gt;(jetbrains.mps.logic.reactor.logical.MetaLogical)" resolve="LogicalImpl" />
+                <node concept="2ShNRf" id="3gNap3g8ELg" role="37wK5m">
+                  <node concept="1pGfFk" id="3gNap3g8ELh" role="2ShVmc">
+                    <ref role="37wK5l" to="bj13:~MetaLogical.&lt;init&gt;(java.lang.String,java.lang.Class)" resolve="MetaLogical" />
+                    <node concept="37vLTw" id="3gNap3g8ELi" role="37wK5m">
+                      <ref role="3cqZAo" node="3gNap3g8EL7" resolve="name" />
+                    </node>
+                    <node concept="3VsKOn" id="3gNap3g8ELj" role="37wK5m">
+                      <ref role="3VsUkX" to="6exd:5JQSuNswOXL" resolve="TermNode" />
                     </node>
                   </node>
                 </node>
               </node>
             </node>
-            <node concept="3uibUv" id="1OShD0I14Nx" role="10QFUM">
-              <ref role="3uigEE" to="6exd:uNmovXiEd4" resolve="Variable" />
-            </node>
           </node>
         </node>
       </node>
@@ -301,30 +332,25 @@
       <node concept="3Tm6S6" id="3mz2_dYxTYH" role="1B3o_S" />
       <node concept="3clFbS" id="3mz2_dYxTYI" role="3clF47">
         <node concept="3clFbF" id="3mz2_dYxTYJ" role="3cqZAp">
-          <node concept="10QFUN" id="3mz2_dYxTYK" role="3clFbG">
-            <node concept="2YIFZM" id="74q$MmRB2bk" role="10QFUP">
-              <ref role="37wK5l" to="7n8k:4TCblo5YI1H" resolve="asVariable" />
-              <ref role="1Pybhc" to="7n8k:677NV565N1x" resolve="LogicalUtil" />
-              <node concept="2ShNRf" id="6yEjedm5vBK" role="37wK5m">
-                <node concept="1pGfFk" id="6yEjedm5vBL" role="2ShVmc">
-                  <ref role="37wK5l" to="zx3l:~LogicalImpl.&lt;init&gt;(jetbrains.mps.logic.reactor.logical.MetaLogical)" resolve="LogicalImpl" />
-                  <node concept="2ShNRf" id="6yEjedm5vBM" role="37wK5m">
-                    <node concept="1pGfFk" id="6yEjedm5vBN" role="2ShVmc">
-                      <ref role="37wK5l" to="bj13:~MetaLogical.&lt;init&gt;(java.lang.String,java.lang.Class)" resolve="MetaLogical" />
-                      <node concept="37vLTw" id="6yEjedm5vBO" role="37wK5m">
-                        <ref role="3cqZAo" node="3mz2_dYxTYE" resolve="name" />
-                      </node>
-                      <node concept="3VsKOn" id="6yEjedm5vBP" role="37wK5m">
-                        <ref role="3VsUkX" to="6exd:3OPtF03lco4" resolve="ListNode" />
-                      </node>
+          <node concept="2YIFZM" id="3gNap3fNlJn" role="3clFbG">
+            <ref role="37wK5l" to="oy3s:4TCblo5YI1H" resolve="asVariable" />
+            <ref role="1Pybhc" to="oy3s:677NV565N1x" resolve="LogicalUtil" />
+            <node concept="2ShNRf" id="6yEjedm5vBK" role="37wK5m">
+              <node concept="1pGfFk" id="6yEjedm5vBL" role="2ShVmc">
+                <ref role="37wK5l" to="zx3l:~LogicalImpl.&lt;init&gt;(jetbrains.mps.logic.reactor.logical.MetaLogical)" resolve="LogicalImpl" />
+                <node concept="2ShNRf" id="6yEjedm5vBM" role="37wK5m">
+                  <node concept="1pGfFk" id="6yEjedm5vBN" role="2ShVmc">
+                    <ref role="37wK5l" to="bj13:~MetaLogical.&lt;init&gt;(java.lang.String,java.lang.Class)" resolve="MetaLogical" />
+                    <node concept="37vLTw" id="6yEjedm5vBO" role="37wK5m">
+                      <ref role="3cqZAo" node="3mz2_dYxTYE" resolve="name" />
+                    </node>
+                    <node concept="3VsKOn" id="6yEjedm5vBP" role="37wK5m">
+                      <ref role="3VsUkX" to="6exd:3OPtF03lco4" resolve="ListNode" />
                     </node>
                   </node>
                 </node>
               </node>
             </node>
-            <node concept="3uibUv" id="3mz2_dYxTYV" role="10QFUM">
-              <ref role="3uigEE" to="6exd:uNmovXiEd4" resolve="Variable" />
-            </node>
           </node>
         </node>
       </node>
@@ -338,27 +364,22 @@
       <node concept="3Tm6S6" id="5cGCTtqzoJO" role="1B3o_S" />
       <node concept="3clFbS" id="5cGCTtqzoJP" role="3clF47">
         <node concept="3clFbF" id="5cGCTtqzoJQ" role="3cqZAp">
-          <node concept="10QFUN" id="5cGCTtqzoJR" role="3clFbG">
-            <node concept="3uibUv" id="5cGCTtqzoJY" role="10QFUM">
-              <ref role="3uigEE" to="6exd:uNmovXiEd4" resolve="Variable" />
-            </node>
-            <node concept="2YIFZM" id="74q$MmRB2br" role="10QFUP">
-              <ref role="37wK5l" to="7n8k:4TCblo5YI1H" resolve="asVariable" />
-              <ref role="1Pybhc" to="7n8k:677NV565N1x" resolve="LogicalUtil" />
-              <node concept="2ShNRf" id="5cGCTtqzoJT" role="37wK5m">
-                <node concept="1pGfFk" id="6yEjedm5xLL" role="2ShVmc">
-                  <ref role="37wK5l" to="zx3l:~LogicalImpl.&lt;init&gt;(jetbrains.mps.logic.reactor.logical.MetaLogical)" resolve="LogicalImpl" />
-                  <node concept="2ShNRf" id="6yEjedm6$x1" role="37wK5m">
-                    <node concept="1pGfFk" id="6yEjedm6$Su" role="2ShVmc">
-                      <ref role="37wK5l" to="bj13:~MetaLogical.&lt;init&gt;(java.lang.Class)" resolve="MetaLogical" />
-                      <node concept="3VsKOn" id="6yEjedm6_je" role="37wK5m">
-                        <ref role="3VsUkX" to="6exd:1bm7a6EXvsP" resolve="DataForm" />
-                      </node>
+          <node concept="2YIFZM" id="3gNap3fNlJo" role="3clFbG">
+            <ref role="37wK5l" to="oy3s:4TCblo5YI1H" resolve="asVariable" />
+            <ref role="1Pybhc" to="oy3s:677NV565N1x" resolve="LogicalUtil" />
+            <node concept="2ShNRf" id="5cGCTtqzoJT" role="37wK5m">
+              <node concept="1pGfFk" id="6yEjedm5xLL" role="2ShVmc">
+                <ref role="37wK5l" to="zx3l:~LogicalImpl.&lt;init&gt;(jetbrains.mps.logic.reactor.logical.MetaLogical)" resolve="LogicalImpl" />
+                <node concept="2ShNRf" id="6yEjedm6$x1" role="37wK5m">
+                  <node concept="1pGfFk" id="6yEjedm6$Su" role="2ShVmc">
+                    <ref role="37wK5l" to="bj13:~MetaLogical.&lt;init&gt;(java.lang.Class)" resolve="MetaLogical" />
+                    <node concept="3VsKOn" id="6yEjedm6_je" role="37wK5m">
+                      <ref role="3VsUkX" to="6exd:1bm7a6EXvsP" resolve="DataForm" />
                     </node>
                   </node>
-                  <node concept="3uibUv" id="6yEjedm5xWn" role="1pMfVU">
-                    <ref role="3uigEE" to="6exd:1bm7a6EXvsP" resolve="DataForm" />
-                  </node>
+                </node>
+                <node concept="3uibUv" id="6yEjedm5xWn" role="1pMfVU">
+                  <ref role="3uigEE" to="6exd:1bm7a6EXvsP" resolve="DataForm" />
                 </node>
               </node>
             </node>
@@ -366,6 +387,41 @@
         </node>
       </node>
     </node>
+    <node concept="2tJIrI" id="3gNap3g8Lll" role="jymVt" />
+    <node concept="3clFb_" id="3gNap3g8LjT" role="jymVt">
+      <property role="TrG5h" value="asLogicalValue" />
+      <node concept="37vLTG" id="3gNap3g8LjU" role="3clF46">
+        <property role="TrG5h" value="var" />
+        <node concept="3uibUv" id="3gNap3g8LjV" role="1tU5fm">
+          <ref role="3uigEE" to="6exd:uNmovXiEd4" resolve="Variable" />
+        </node>
+      </node>
+      <node concept="3uibUv" id="3gNap3g8LjW" role="3clF45">
+        <ref role="3uigEE" to="bj13:~Logical" resolve="Logical" />
+        <node concept="3qTvmN" id="3gNap3g8LjX" role="11_B2D" />
+      </node>
+      <node concept="3Tm6S6" id="3gNap3g8LjY" role="1B3o_S" />
+      <node concept="3clFbS" id="3gNap3g8LjZ" role="3clF47">
+        <node concept="3clFbF" id="3gNap3g8Lk0" role="3cqZAp">
+          <node concept="2OqwBi" id="3gNap3g8Lk1" role="3clFbG">
+            <node concept="1eOMI4" id="3gNap3g8Lk2" role="2Oq$k0">
+              <node concept="10QFUN" id="3gNap3g8Lk3" role="1eOMHV">
+                <node concept="37vLTw" id="3gNap3g8Lk4" role="10QFUP">
+                  <ref role="3cqZAo" node="3gNap3g8LjU" resolve="var" />
+                </node>
+                <node concept="3uibUv" id="3gNap3g8Lk5" role="10QFUM">
+                  <ref role="3uigEE" to="oy3s:3gNap3fN2hw" resolve="LogicalValue" />
+                  <node concept="3qTvmN" id="3gNap3g8Lk6" role="11_B2D" />
+                </node>
+              </node>
+            </node>
+            <node concept="liA8E" id="3gNap3g8Lk7" role="2OqNvi">
+              <ref role="37wK5l" to="bj13:~LogicalOwner.logical():jetbrains.mps.logic.reactor.logical.Logical" resolve="logical" />
+            </node>
+          </node>
+        </node>
+      </node>
+    </node>
     <node concept="3Tm1VV" id="5NuEpF1$W3O" role="1B3o_S" />
     <node concept="3s_gsd" id="5NuEpF1$W3P" role="3s_ewO">
       <node concept="3s$Bmu" id="fHk0tWulwY" role="3s_gse">
@@ -514,7 +570,7 @@
                       <property role="1oi5yK" value="" />
                       <node concept="22Ky0T" id="53iOybEHDsd" role="lGtFl">
                         <node concept="1rXfSq" id="53iOybEHEjW" role="22Ky0K">
-                          <ref role="37wK5l" node="21Zu7ABuubV" resolve="var" />
+                          <ref role="37wK5l" node="21Zu7ABuubV" resolve="termvar" />
                           <node concept="Xl_RD" id="53iOybEHEkx" role="37wK5m">
                             <property role="Xl_RC" value="X" />
                           </node>
@@ -555,7 +611,7 @@
                   <ref role="3cqZAo" node="53iOybEHDaF" resolve="a" />
                 </node>
                 <node concept="1rXfSq" id="6N2bvv_upxz" role="37wK5m">
-                  <ref role="37wK5l" node="21Zu7ABuubV" resolve="var" />
+                  <ref role="37wK5l" node="21Zu7ABuubV" resolve="termvar" />
                   <node concept="Xl_RD" id="6N2bvv_upxR" role="37wK5m">
                     <property role="Xl_RC" value="Y" />
                   </node>
@@ -565,6 +621,242 @@
           </node>
         </node>
       </node>
+      <node concept="3s$Bmu" id="3gNap3g8Gb6" role="3s_gse">
+        <property role="3s$Bm0" value="value_stringvar" />
+        <node concept="3cqZAl" id="3gNap3g8Gb7" role="3clF45" />
+        <node concept="3Tm1VV" id="3gNap3g8Gb8" role="1B3o_S" />
+        <node concept="3clFbS" id="3gNap3g8Gb9" role="3clF47">
+          <node concept="3clFbH" id="3gNap3g8Gba" role="3cqZAp" />
+          <node concept="3cpWs8" id="3gNap3g8Gbb" role="3cqZAp">
+            <node concept="3cpWsn" id="3gNap3g8Gbc" role="3cpWs9">
+              <property role="TrG5h" value="a" />
+              <node concept="3uibUv" id="3gNap3g8Gbd" role="1tU5fm">
+                <ref role="3uigEE" to="6exd:1bm7a6EXvsP" resolve="DataForm" />
+              </node>
+              <node concept="1oi1Uc" id="3gNap3g8Gbe" role="33vP2m">
+                <node concept="1oi5UN" id="3gNap3g8Gbf" role="1oi0x0">
+                  <node concept="1oi5Wm" id="3gNap3g8Gbg" role="1ojpOf">
+                    <property role="TrG5h" value="name" />
+                    <node concept="1oi5XN" id="3gNap3g8Gbh" role="1oi5zu">
+                      <property role="1oi5yK" value="foo" />
+                    </node>
+                  </node>
+                  <node concept="1oi5Wm" id="3gNap3g8GkD" role="1ojpOf">
+                    <property role="TrG5h" value="val" />
+                    <node concept="1oi5XN" id="3gNap3g8GkP" role="1oi5zu">
+                      <node concept="22Ky0T" id="3gNap3g8GkW" role="lGtFl">
+                        <node concept="1rXfSq" id="3gNap3g8Gl$" role="22Ky0K">
+                          <ref role="37wK5l" node="3gNap3g8EL6" resolve="stringvar" />
+                          <node concept="Xl_RD" id="3gNap3g8GlT" role="37wK5m">
+                            <property role="Xl_RC" value="X" />
+                          </node>
+                        </node>
+                      </node>
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3cpWs8" id="3gNap3g8Gbi" role="3cqZAp">
+            <node concept="3cpWsn" id="3gNap3g8Gbj" role="3cpWs9">
+              <property role="TrG5h" value="b" />
+              <node concept="3uibUv" id="3gNap3g8Gbk" role="1tU5fm">
+                <ref role="3uigEE" to="6exd:1bm7a6EXvsP" resolve="DataForm" />
+              </node>
+              <node concept="1oi1Uc" id="3gNap3g8Gbl" role="33vP2m">
+                <node concept="1oi5UN" id="3gNap3g8Gbm" role="1oi0x0">
+                  <node concept="1oi5Wm" id="3gNap3g8Gbn" role="1ojpOf">
+                    <property role="TrG5h" value="name" />
+                    <node concept="1oi5XN" id="3gNap3g8Gbo" role="1oi5zu">
+                      <property role="1oi5yK" value="foo" />
+                    </node>
+                  </node>
+                  <node concept="1oi5Wm" id="3gNap3g8Gm8" role="1ojpOf">
+                    <property role="TrG5h" value="val" />
+                    <node concept="1oi5XN" id="3gNap3g8Gmc" role="1oi5zu">
+                      <property role="1oi5yK" value="xyz" />
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbH" id="3gNap3g8Gbs" role="3cqZAp" />
+          <node concept="3vwNmj" id="3gNap3g8Gbt" role="3cqZAp">
+            <node concept="2OqwBi" id="3gNap3g8Gbu" role="3vwVQn">
+              <node concept="37vLTw" id="3gNap3g8Gbv" role="2Oq$k0">
+                <ref role="3cqZAo" node="fHk0tWuntB" resolve="unificationSolver" />
+              </node>
+              <node concept="liA8E" id="3gNap3g8Gbw" role="2OqNvi">
+                <ref role="37wK5l" to="mqqo:6yEjedm5XWy" resolve="askUni" />
+                <node concept="37vLTw" id="3gNap3g8Gbx" role="37wK5m">
+                  <ref role="3cqZAo" node="3gNap3g8Gbc" resolve="a" />
+                </node>
+                <node concept="37vLTw" id="3gNap3g8Gby" role="37wK5m">
+                  <ref role="3cqZAo" node="3gNap3g8Gbj" resolve="b" />
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="3s$Bmu" id="3gNap3g8JK3" role="3s_gse">
+        <property role="3s$Bm0" value="value_assigned_stringvar" />
+        <node concept="3cqZAl" id="3gNap3g8JK4" role="3clF45" />
+        <node concept="3Tm1VV" id="3gNap3g8JK5" role="1B3o_S" />
+        <node concept="3clFbS" id="3gNap3g8JK6" role="3clF47">
+          <node concept="3clFbH" id="3gNap3g8JK7" role="3cqZAp" />
+          <node concept="3cpWs8" id="3gNap3g8JUb" role="3cqZAp">
+            <node concept="3cpWsn" id="3gNap3g8JUc" role="3cpWs9">
+              <property role="TrG5h" value="x" />
+              <node concept="3uibUv" id="3gNap3g8JU9" role="1tU5fm">
+                <ref role="3uigEE" to="6exd:uNmovXiEd4" resolve="Variable" />
+              </node>
+              <node concept="1rXfSq" id="3gNap3g8JUd" role="33vP2m">
+                <ref role="37wK5l" node="3gNap3g8EL6" resolve="stringvar" />
+                <node concept="Xl_RD" id="3gNap3g8JUe" role="37wK5m">
+                  <property role="Xl_RC" value="X" />
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbF" id="3gNap3g8LmT" role="3cqZAp">
+            <node concept="2OqwBi" id="3gNap3g8LVl" role="3clFbG">
+              <node concept="1eOMI4" id="3gNap3g8LL3" role="2Oq$k0">
+                <node concept="10QFUN" id="3gNap3g8LL0" role="1eOMHV">
+                  <node concept="3uibUv" id="3gNap3g8LLe" role="10QFUM">
+                    <ref role="3uigEE" to="bj13:~JoinableLogical" resolve="JoinableLogical" />
+                    <node concept="17QB3L" id="3gNap3g8LLm" role="11_B2D" />
+                  </node>
+                  <node concept="1rXfSq" id="3gNap3g8LL5" role="10QFUP">
+                    <ref role="37wK5l" node="3gNap3g8LjT" resolve="asLogicalValue" />
+                    <node concept="37vLTw" id="3gNap3g8LL6" role="37wK5m">
+                      <ref role="3cqZAo" node="3gNap3g8JUc" resolve="x" />
+                    </node>
+                  </node>
+                </node>
+              </node>
+              <node concept="liA8E" id="3gNap3g8MRy" role="2OqNvi">
+                <ref role="37wK5l" to="bj13:~JoinableLogical.setValue(java.lang.Object):void" resolve="setValue" />
+                <node concept="Xl_RD" id="3gNap3g8MRS" role="37wK5m">
+                  <property role="Xl_RC" value="xyz" />
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbH" id="3gNap3g8MTo" role="3cqZAp" />
+          <node concept="3cpWs8" id="3gNap3g8JK8" role="3cqZAp">
+            <node concept="3cpWsn" id="3gNap3g8JK9" role="3cpWs9">
+              <property role="TrG5h" value="a" />
+              <node concept="3uibUv" id="3gNap3g8JKa" role="1tU5fm">
+                <ref role="3uigEE" to="6exd:1bm7a6EXvsP" resolve="DataForm" />
+              </node>
+              <node concept="1oi1Uc" id="3gNap3g8JKb" role="33vP2m">
+                <node concept="1oi5UN" id="3gNap3g8JKc" role="1oi0x0">
+                  <node concept="1oi5Wm" id="3gNap3g8JKd" role="1ojpOf">
+                    <property role="TrG5h" value="name" />
+                    <node concept="1oi5XN" id="3gNap3g8JKe" role="1oi5zu">
+                      <property role="1oi5yK" value="foo" />
+                    </node>
+                  </node>
+                  <node concept="1oi5Wm" id="3gNap3g8JKf" role="1ojpOf">
+                    <property role="TrG5h" value="val" />
+                    <node concept="1oi5XN" id="3gNap3g8JKg" role="1oi5zu">
+                      <node concept="22Ky0T" id="3gNap3g8JKh" role="lGtFl">
+                        <node concept="37vLTw" id="3gNap3g8JUf" role="22Ky0K">
+                          <ref role="3cqZAo" node="3gNap3g8JUc" resolve="x" />
+                        </node>
+                      </node>
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3cpWs8" id="3gNap3g8JKk" role="3cqZAp">
+            <node concept="3cpWsn" id="3gNap3g8JKl" role="3cpWs9">
+              <property role="TrG5h" value="b" />
+              <node concept="3uibUv" id="3gNap3g8JKm" role="1tU5fm">
+                <ref role="3uigEE" to="6exd:1bm7a6EXvsP" resolve="DataForm" />
+              </node>
+              <node concept="1oi1Uc" id="3gNap3g8JKn" role="33vP2m">
+                <node concept="1oi5UN" id="3gNap3g8JKo" role="1oi0x0">
+                  <node concept="1oi5Wm" id="3gNap3g8JKp" role="1ojpOf">
+                    <property role="TrG5h" value="name" />
+                    <node concept="1oi5XN" id="3gNap3g8JKq" role="1oi5zu">
+                      <property role="1oi5yK" value="foo" />
+                    </node>
+                  </node>
+                  <node concept="1oi5Wm" id="3gNap3g8JKr" role="1ojpOf">
+                    <property role="TrG5h" value="val" />
+                    <node concept="1oi5XN" id="3gNap3g8JKs" role="1oi5zu">
+                      <property role="1oi5yK" value="xyz" />
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3cpWs8" id="3gNap3g94O8" role="3cqZAp">
+            <node concept="3cpWsn" id="3gNap3g94O9" role="3cpWs9">
+              <property role="TrG5h" value="c" />
+              <node concept="3uibUv" id="3gNap3g94Oa" role="1tU5fm">
+                <ref role="3uigEE" to="6exd:1bm7a6EXvsP" resolve="DataForm" />
+              </node>
+              <node concept="1oi1Uc" id="3gNap3g94Ob" role="33vP2m">
+                <node concept="1oi5UN" id="3gNap3g94Oc" role="1oi0x0">
+                  <node concept="1oi5Wm" id="3gNap3g94Od" role="1ojpOf">
+                    <property role="TrG5h" value="name" />
+                    <node concept="1oi5XN" id="3gNap3g94Oe" role="1oi5zu">
+                      <property role="1oi5yK" value="foo" />
+                    </node>
+                  </node>
+                  <node concept="1oi5Wm" id="3gNap3g94Of" role="1ojpOf">
+                    <property role="TrG5h" value="val" />
+                    <node concept="1oi5XN" id="3gNap3g94Og" role="1oi5zu">
+                      <property role="1oi5yK" value="abc" />
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbH" id="3gNap3g8JKt" role="3cqZAp" />
+          <node concept="3vwNmj" id="3gNap3g8JKu" role="3cqZAp">
+            <node concept="2OqwBi" id="3gNap3g8JKv" role="3vwVQn">
+              <node concept="37vLTw" id="3gNap3g8JKw" role="2Oq$k0">
+                <ref role="3cqZAo" node="fHk0tWuntB" resolve="unificationSolver" />
+              </node>
+              <node concept="liA8E" id="3gNap3g8JKx" role="2OqNvi">
+                <ref role="37wK5l" to="mqqo:6yEjedm5XWy" resolve="askUni" />
+                <node concept="37vLTw" id="3gNap3g8JKy" role="37wK5m">
+                  <ref role="3cqZAo" node="3gNap3g8JK9" resolve="a" />
+                </node>
+                <node concept="37vLTw" id="3gNap3g8JKz" role="37wK5m">
+                  <ref role="3cqZAo" node="3gNap3g8JKl" resolve="b" />
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3vFxKo" id="3gNap3g94Tw" role="3cqZAp">
+            <node concept="2OqwBi" id="3gNap3g94Ur" role="3vFALc">
+              <node concept="37vLTw" id="3gNap3g94Us" role="2Oq$k0">
+                <ref role="3cqZAo" node="fHk0tWuntB" resolve="unificationSolver" />
+              </node>
+              <node concept="liA8E" id="3gNap3g94Ut" role="2OqNvi">
+                <ref role="37wK5l" to="mqqo:6yEjedm5XWy" resolve="askUni" />
+                <node concept="37vLTw" id="3gNap3g94Uu" role="37wK5m">
+                  <ref role="3cqZAo" node="3gNap3g8JK9" resolve="a" />
+                </node>
+                <node concept="37vLTw" id="3gNap3g95cW" role="37wK5m">
+                  <ref role="3cqZAo" node="3gNap3g94O9" resolve="c" />
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
       <node concept="3s$Bmu" id="21Zu7ABunhH" role="3s_gse">
         <property role="3s$Bm0" value="var" />
         <node concept="3cqZAl" id="21Zu7ABunhI" role="3clF45" />
@@ -585,7 +877,7 @@
                       <node concept="1oi5UN" id="677NV56vfMM" role="KCVpo">
                         <node concept="22Ky0T" id="677NV56vfMN" role="lGtFl">
                           <node concept="1rXfSq" id="21Zu7ABuxPJ" role="22Ky0K">
-                            <ref role="37wK5l" node="21Zu7ABuubV" resolve="var" />
+                            <ref role="37wK5l" node="21Zu7ABuubV" resolve="termvar" />
                             <node concept="Xl_RD" id="21Zu7ABuxQL" role="37wK5m">
                               <property role="Xl_RC" value="X" />
                             </node>
@@ -618,7 +910,7 @@
                       <node concept="1oi5UN" id="677NV56vfMG" role="KCVpo">
                         <node concept="22Ky0T" id="677NV56vfMH" role="lGtFl">
                           <node concept="1rXfSq" id="21Zu7ABuxSN" role="22Ky0K">
-                            <ref role="37wK5l" node="21Zu7ABuubV" resolve="var" />
+                            <ref role="37wK5l" node="21Zu7ABuubV" resolve="termvar" />
                             <node concept="Xl_RD" id="21Zu7ABuxTP" role="37wK5m">
                               <property role="Xl_RC" value="Y" />
                             </node>
@@ -663,13 +955,13 @@
               <node concept="liA8E" id="6N2bvv_usQG" role="2OqNvi">
                 <ref role="37wK5l" to="mqqo:6yEjedm5XWy" resolve="askUni" />
                 <node concept="1rXfSq" id="6N2bvv_usTK" role="37wK5m">
-                  <ref role="37wK5l" node="21Zu7ABuubV" resolve="var" />
+                  <ref role="37wK5l" node="21Zu7ABuubV" resolve="termvar" />
                   <node concept="Xl_RD" id="6N2bvv_usU4" role="37wK5m">
                     <property role="Xl_RC" value="Y" />
                   </node>
                 </node>
                 <node concept="1rXfSq" id="6N2bvv_ut1x" role="37wK5m">
-                  <ref role="37wK5l" node="21Zu7ABuubV" resolve="var" />
+                  <ref role="37wK5l" node="21Zu7ABuubV" resolve="termvar" />
                   <node concept="Xl_RD" id="6N2bvv_ut1Q" role="37wK5m">
                     <property role="Xl_RC" value="Z" />
                   </node>
@@ -730,7 +1022,7 @@
                       <node concept="1oi5UN" id="677NV56vfN$" role="KCVpo">
                         <node concept="22Ky0T" id="677NV56vfN_" role="lGtFl">
                           <node concept="1rXfSq" id="21Zu7ABuxYK" role="22Ky0K">
-                            <ref role="37wK5l" node="21Zu7ABuubV" resolve="var" />
+                            <ref role="37wK5l" node="21Zu7ABuubV" resolve="termvar" />
                             <node concept="Xl_RD" id="21Zu7ABuxZM" role="37wK5m">
                               <property role="Xl_RC" value="X" />
                             </node>
@@ -826,7 +1118,7 @@
                     <node concept="1oi5UN" id="677NV56vfNk" role="1oi5TL">
                       <node concept="22Ky0T" id="677NV56vfNl" role="lGtFl">
                         <node concept="1rXfSq" id="1OShD0I0umD" role="22Ky0K">
-                          <ref role="37wK5l" node="21Zu7ABuubV" resolve="var" />
+                          <ref role="37wK5l" node="21Zu7ABuubV" resolve="termvar" />
                           <node concept="Xl_RD" id="1OShD0I0umE" role="37wK5m">
                             <property role="Xl_RC" value="X" />
                           </node>
@@ -930,7 +1222,7 @@
                       <node concept="1oi5UN" id="677NV56y2bu" role="KCVpo">
                         <node concept="22Ky0T" id="677NV56y2bv" role="lGtFl">
                           <node concept="1rXfSq" id="1OShD0I16xN" role="22Ky0K">
-                            <ref role="37wK5l" node="21Zu7ABuubV" resolve="var" />
+                            <ref role="37wK5l" node="21Zu7ABuubV" resolve="termvar" />
                             <node concept="Xl_RD" id="1OShD0I16xO" role="37wK5m">
                               <property role="Xl_RC" value="X" />
                             </node>
@@ -1258,7 +1550,7 @@
                 <ref role="3uigEE" to="6exd:uNmovXiEd4" resolve="Variable" />
               </node>
               <node concept="1rXfSq" id="5_6ImQYXM2X" role="33vP2m">
-                <ref role="37wK5l" node="21Zu7ABuubV" resolve="var" />
+                <ref role="37wK5l" node="21Zu7ABuubV" resolve="termvar" />
                 <node concept="Xl_RD" id="5_6ImQYXM2Y" role="37wK5m">
                   <property role="Xl_RC" value="head" />
                 </node>
@@ -1449,7 +1741,7 @@
                 <ref role="3uigEE" to="6exd:uNmovXiEd4" resolve="Variable" />
               </node>
               <node concept="1rXfSq" id="5_6ImQYY3rQ" role="33vP2m">
-                <ref role="37wK5l" node="21Zu7ABuubV" resolve="var" />
+                <ref role="37wK5l" node="21Zu7ABuubV" resolve="termvar" />
                 <node concept="Xl_RD" id="5_6ImQYY3rR" role="37wK5m">
                   <property role="Xl_RC" value="head" />
                 </node>
@@ -1589,7 +1881,7 @@
                 <ref role="3uigEE" to="6exd:uNmovXiEd4" resolve="Variable" />
               </node>
               <node concept="1rXfSq" id="5_6ImQYY68u" role="33vP2m">
-                <ref role="37wK5l" node="21Zu7ABuubV" resolve="var" />
+                <ref role="37wK5l" node="21Zu7ABuubV" resolve="termvar" />
                 <node concept="Xl_RD" id="5_6ImQYY68v" role="37wK5m">
                   <property role="Xl_RC" value="head" />
                 </node>
@@ -1603,7 +1895,7 @@
                 <ref role="3uigEE" to="6exd:uNmovXiEd4" resolve="Variable" />
               </node>
               <node concept="1rXfSq" id="5_6ImQYY68z" role="33vP2m">
-                <ref role="37wK5l" node="21Zu7ABuubV" resolve="var" />
+                <ref role="37wK5l" node="21Zu7ABuubV" resolve="termvar" />
                 <node concept="Xl_RD" id="5_6ImQYY68$" role="37wK5m">
                   <property role="Xl_RC" value="tail" />
                 </node>
@@ -1705,13 +1997,8 @@
         <node concept="3clFbF" id="fHk0tWuoLS" role="3cqZAp">
           <node concept="37vLTI" id="fHk0tWuoPJ" role="3clFbG">
             <node concept="2ShNRf" id="fHk0tWuoQm" role="37vLTx">
-              <node concept="1pGfFk" id="fHk0tWutdI" role="2ShVmc">
-                <ref role="37wK5l" to="mqqo:6yEjedm5WI7" resolve="TestingUnificationSolver" />
-                <node concept="2ShNRf" id="6yEjedm5KqE" role="37wK5m">
-                  <node concept="HV5vD" id="4xTpErjR48y" role="2ShVmc">
-                    <ref role="HV5vE" to="oy3s:4xTpErjR15$" resolve="DefaultLogicalUnification" />
-                  </node>
-                </node>
+              <node concept="HV5vD" id="3gNap3fFfNh" role="2ShVmc">
+                <ref role="HV5vE" to="mqqo:6yEjedm5WkE" resolve="TestingUnificationSolver" />
               </node>
             </node>
             <node concept="37vLTw" id="fHk0tWuoLQ" role="37vLTJ">
@@ -1785,9 +2072,45 @@
         </node>
       </node>
     </node>
-    <node concept="2tJIrI" id="6yEjedm71gP" role="jymVt" />
+    <node concept="2tJIrI" id="3gNap3g7W6W" role="jymVt" />
+    <node concept="3clFb_" id="3gNap3g7W17" role="jymVt">
+      <property role="TrG5h" value="stringvar" />
+      <node concept="37vLTG" id="3gNap3g7W18" role="3clF46">
+        <property role="TrG5h" value="name" />
+        <node concept="17QB3L" id="3gNap3g7W19" role="1tU5fm" />
+      </node>
+      <node concept="3uibUv" id="3gNap3g7W1a" role="3clF45">
+        <ref role="3uigEE" to="6exd:uNmovXiEd4" resolve="Variable" />
+      </node>
+      <node concept="3Tm6S6" id="3gNap3g7W1b" role="1B3o_S" />
+      <node concept="3clFbS" id="3gNap3g7W1c" role="3clF47">
+        <node concept="3clFbF" id="3gNap3g7W1d" role="3cqZAp">
+          <node concept="2YIFZM" id="3gNap3g7Wf$" role="3clFbG">
+            <ref role="37wK5l" to="oy3s:3gNap3fZcVn" resolve="asValue" />
+            <ref role="1Pybhc" to="oy3s:677NV565N1x" resolve="LogicalUtil" />
+            <node concept="2ShNRf" id="3gNap3g7Wf_" role="37wK5m">
+              <node concept="1pGfFk" id="3gNap3g7WfA" role="2ShVmc">
+                <ref role="37wK5l" to="zx3l:~LogicalImpl.&lt;init&gt;(jetbrains.mps.logic.reactor.logical.MetaLogical)" resolve="LogicalImpl" />
+                <node concept="2ShNRf" id="3gNap3g7WfB" role="37wK5m">
+                  <node concept="1pGfFk" id="3gNap3g7WfC" role="2ShVmc">
+                    <ref role="37wK5l" to="bj13:~MetaLogical.&lt;init&gt;(java.lang.String,java.lang.Class)" resolve="MetaLogical" />
+                    <node concept="37vLTw" id="3gNap3g7WfD" role="37wK5m">
+                      <ref role="3cqZAo" node="3gNap3g7W18" resolve="name" />
+                    </node>
+                    <node concept="3VsKOn" id="3gNap3g7XPE" role="37wK5m">
+                      <ref role="3VsUkX" to="wyt6:~String" resolve="String" />
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+    </node>
+    <node concept="2tJIrI" id="3gNap3g7Wc$" role="jymVt" />
     <node concept="3clFb_" id="6yEjedm71gQ" role="jymVt">
-      <property role="TrG5h" value="var" />
+      <property role="TrG5h" value="termvar" />
       <node concept="37vLTG" id="6yEjedm71gR" role="3clF46">
         <property role="TrG5h" value="name" />
         <node concept="17QB3L" id="6yEjedm71gS" role="1tU5fm" />
@@ -1798,30 +2121,25 @@
       <node concept="3Tm6S6" id="6yEjedm71gU" role="1B3o_S" />
       <node concept="3clFbS" id="6yEjedm71gV" role="3clF47">
         <node concept="3clFbF" id="6yEjedm71gW" role="3cqZAp">
-          <node concept="10QFUN" id="6yEjedm71gX" role="3clFbG">
-            <node concept="2YIFZM" id="74q$MmRB2bn" role="10QFUP">
-              <ref role="37wK5l" to="7n8k:4TCblo5YI1H" resolve="asVariable" />
-              <ref role="1Pybhc" to="7n8k:677NV565N1x" resolve="LogicalUtil" />
-              <node concept="2ShNRf" id="6yEjedm71gZ" role="37wK5m">
-                <node concept="1pGfFk" id="6yEjedm71h0" role="2ShVmc">
-                  <ref role="37wK5l" to="zx3l:~LogicalImpl.&lt;init&gt;(jetbrains.mps.logic.reactor.logical.MetaLogical)" resolve="LogicalImpl" />
-                  <node concept="2ShNRf" id="6yEjedm71h1" role="37wK5m">
-                    <node concept="1pGfFk" id="6yEjedm71h2" role="2ShVmc">
-                      <ref role="37wK5l" to="bj13:~MetaLogical.&lt;init&gt;(java.lang.String,java.lang.Class)" resolve="MetaLogical" />
-                      <node concept="37vLTw" id="6yEjedm71h3" role="37wK5m">
-                        <ref role="3cqZAo" node="6yEjedm71gR" resolve="name" />
-                      </node>
-                      <node concept="3VsKOn" id="6yEjedm71h4" role="37wK5m">
-                        <ref role="3VsUkX" to="6exd:5JQSuNswOXL" resolve="TermNode" />
-                      </node>
+          <node concept="2YIFZM" id="3gNap3fNlJp" role="3clFbG">
+            <ref role="37wK5l" to="oy3s:4TCblo5YI1H" resolve="asVariable" />
+            <ref role="1Pybhc" to="oy3s:677NV565N1x" resolve="LogicalUtil" />
+            <node concept="2ShNRf" id="6yEjedm71gZ" role="37wK5m">
+              <node concept="1pGfFk" id="6yEjedm71h0" role="2ShVmc">
+                <ref role="37wK5l" to="zx3l:~LogicalImpl.&lt;init&gt;(jetbrains.mps.logic.reactor.logical.MetaLogical)" resolve="LogicalImpl" />
+                <node concept="2ShNRf" id="6yEjedm71h1" role="37wK5m">
+                  <node concept="1pGfFk" id="6yEjedm71h2" role="2ShVmc">
+                    <ref role="37wK5l" to="bj13:~MetaLogical.&lt;init&gt;(java.lang.String,java.lang.Class)" resolve="MetaLogical" />
+                    <node concept="37vLTw" id="6yEjedm71h3" role="37wK5m">
+                      <ref role="3cqZAo" node="6yEjedm71gR" resolve="name" />
+                    </node>
+                    <node concept="3VsKOn" id="6yEjedm71h4" role="37wK5m">
+                      <ref role="3VsUkX" to="6exd:5JQSuNswOXL" resolve="TermNode" />
                     </node>
                   </node>
                 </node>
               </node>
             </node>
-            <node concept="3uibUv" id="6yEjedm71h5" role="10QFUM">
-              <ref role="3uigEE" to="6exd:uNmovXiEd4" resolve="Variable" />
-            </node>
           </node>
         </node>
       </node>
@@ -1839,30 +2157,25 @@
       <node concept="3Tm6S6" id="6yEjedm71hb" role="1B3o_S" />
       <node concept="3clFbS" id="6yEjedm71hc" role="3clF47">
         <node concept="3clFbF" id="6yEjedm71hd" role="3cqZAp">
-          <node concept="10QFUN" id="6yEjedm71he" role="3clFbG">
-            <node concept="2YIFZM" id="74q$MmRB2bp" role="10QFUP">
-              <ref role="37wK5l" to="7n8k:4TCblo5YI1H" resolve="asVariable" />
-              <ref role="1Pybhc" to="7n8k:677NV565N1x" resolve="LogicalUtil" />
-              <node concept="2ShNRf" id="6yEjedm71hg" role="37wK5m">
-                <node concept="1pGfFk" id="6yEjedm71hh" role="2ShVmc">
-                  <ref role="37wK5l" to="zx3l:~LogicalImpl.&lt;init&gt;(jetbrains.mps.logic.reactor.logical.MetaLogical)" resolve="LogicalImpl" />
-                  <node concept="2ShNRf" id="6yEjedm71hi" role="37wK5m">
-                    <node concept="1pGfFk" id="6yEjedm71hj" role="2ShVmc">
-                      <ref role="37wK5l" to="bj13:~MetaLogical.&lt;init&gt;(java.lang.String,java.lang.Class)" resolve="MetaLogical" />
-                      <node concept="37vLTw" id="6yEjedm71hk" role="37wK5m">
-                        <ref role="3cqZAo" node="6yEjedm71h8" resolve="name" />
-                      </node>
-                      <node concept="3VsKOn" id="6yEjedm71hl" role="37wK5m">
-                        <ref role="3VsUkX" to="6exd:3OPtF03lco4" resolve="ListNode" />
-                      </node>
+          <node concept="2YIFZM" id="3gNap3fNlJq" role="3clFbG">
+            <ref role="37wK5l" to="oy3s:4TCblo5YI1H" resolve="asVariable" />
+            <ref role="1Pybhc" to="oy3s:677NV565N1x" resolve="LogicalUtil" />
+            <node concept="2ShNRf" id="6yEjedm71hg" role="37wK5m">
+              <node concept="1pGfFk" id="6yEjedm71hh" role="2ShVmc">
+                <ref role="37wK5l" to="zx3l:~LogicalImpl.&lt;init&gt;(jetbrains.mps.logic.reactor.logical.MetaLogical)" resolve="LogicalImpl" />
+                <node concept="2ShNRf" id="6yEjedm71hi" role="37wK5m">
+                  <node concept="1pGfFk" id="6yEjedm71hj" role="2ShVmc">
+                    <ref role="37wK5l" to="bj13:~MetaLogical.&lt;init&gt;(java.lang.String,java.lang.Class)" resolve="MetaLogical" />
+                    <node concept="37vLTw" id="6yEjedm71hk" role="37wK5m">
+                      <ref role="3cqZAo" node="6yEjedm71h8" resolve="name" />
+                    </node>
+                    <node concept="3VsKOn" id="6yEjedm71hl" role="37wK5m">
+                      <ref role="3VsUkX" to="6exd:3OPtF03lco4" resolve="ListNode" />
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                   </node>
                 </node>
               </node>
             </node>
-            <node concept="3uibUv" id="6yEjedm71hm" role="10QFUM">
-              <ref role="3uigEE" to="6exd:uNmovXiEd4" resolve="Variable" />
-            </node>
           </node>
         </node>
       </node>
@@ -1876,27 +2189,22 @@
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       <node concept="3clFbS" id="6yEjedm71hr" role="3clF47">
         <node concept="3clFbF" id="6yEjedm71hs" role="3cqZAp">
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-              <ref role="3uigEE" to="6exd:uNmovXiEd4" resolve="Variable" />
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-            <node concept="2YIFZM" id="74q$MmRB2bo" role="10QFUP">
-              <ref role="37wK5l" to="7n8k:4TCblo5YI1H" resolve="asVariable" />
-              <ref role="1Pybhc" to="7n8k:677NV565N1x" resolve="LogicalUtil" />
-              <node concept="2ShNRf" id="6yEjedm71hw" role="37wK5m">
-                <node concept="1pGfFk" id="6yEjedm71hx" role="2ShVmc">
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-                  <node concept="2ShNRf" id="6yEjedm71hy" role="37wK5m">
-                    <node concept="1pGfFk" id="6yEjedm71hz" role="2ShVmc">
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-                      <node concept="3VsKOn" id="6yEjedm71h$" role="37wK5m">
-                        <ref role="3VsUkX" to="6exd:1bm7a6EXvsP" resolve="DataForm" />
-                      </node>
+          <node concept="2YIFZM" id="3gNap3fNlJr" role="3clFbG">
+            <ref role="37wK5l" to="oy3s:4TCblo5YI1H" resolve="asVariable" />
+            <ref role="1Pybhc" to="oy3s:677NV565N1x" resolve="LogicalUtil" />
+            <node concept="2ShNRf" id="6yEjedm71hw" role="37wK5m">
+              <node concept="1pGfFk" id="6yEjedm71hx" role="2ShVmc">
+                <ref role="37wK5l" to="zx3l:~LogicalImpl.&lt;init&gt;(jetbrains.mps.logic.reactor.logical.MetaLogical)" resolve="LogicalImpl" />
+                <node concept="2ShNRf" id="6yEjedm71hy" role="37wK5m">
+                  <node concept="1pGfFk" id="6yEjedm71hz" role="2ShVmc">
+                    <ref role="37wK5l" to="bj13:~MetaLogical.&lt;init&gt;(java.lang.Class)" resolve="MetaLogical" />
+                    <node concept="3VsKOn" id="6yEjedm71h$" role="37wK5m">
+                      <ref role="3VsUkX" to="6exd:1bm7a6EXvsP" resolve="DataForm" />
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                   </node>
-                  <node concept="3uibUv" id="6yEjedm71h_" role="1pMfVU">
-                    <ref role="3uigEE" to="6exd:1bm7a6EXvsP" resolve="DataForm" />
-                  </node>
+                </node>
+                <node concept="3uibUv" id="6yEjedm71h_" role="1pMfVU">
+                  <ref role="3uigEE" to="6exd:1bm7a6EXvsP" resolve="DataForm" />
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@@ -1913,22 +2221,17 @@
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       <node concept="3clFbS" id="7nuzzkr25av" role="3clF47">
         <node concept="3clFbF" id="7nuzzkr25aw" role="3cqZAp">
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-              <node concept="2ShNRf" id="7nuzzkr25az" role="37wK5m">
-                <node concept="1pGfFk" id="7nuzzkr25a$" role="2ShVmc">
-                  <ref role="37wK5l" to="zx3l:~LogicalImpl.&lt;init&gt;(jetbrains.mps.logic.reactor.logical.MetaLogical)" resolve="LogicalImpl" />
-                  <node concept="2ShNRf" id="6yEjedm9JNO" role="37wK5m">
-                    <node concept="1pGfFk" id="6yEjedm9KbK" role="2ShVmc">
-                      <ref role="37wK5l" to="bj13:~MetaLogical.&lt;init&gt;(java.lang.Class)" resolve="MetaLogical" />
-                      <node concept="3VsKOn" id="6yEjedm9KAr" role="37wK5m">
-                        <ref role="3VsUkX" to="6exd:1bm7a6EXvsP" resolve="DataForm" />
-                      </node>
+          <node concept="2YIFZM" id="3gNap3fNlJs" role="3clFbG">
+            <ref role="37wK5l" to="oy3s:4TCblo5YI1H" resolve="asVariable" />
+            <ref role="1Pybhc" to="oy3s:677NV565N1x" resolve="LogicalUtil" />
+            <node concept="2ShNRf" id="7nuzzkr25az" role="37wK5m">
+              <node concept="1pGfFk" id="7nuzzkr25a$" role="2ShVmc">
+                <ref role="37wK5l" to="zx3l:~LogicalImpl.&lt;init&gt;(jetbrains.mps.logic.reactor.logical.MetaLogical)" resolve="LogicalImpl" />
+                <node concept="2ShNRf" id="6yEjedm9JNO" role="37wK5m">
+                  <node concept="1pGfFk" id="6yEjedm9KbK" role="2ShVmc">
+                    <ref role="37wK5l" to="bj13:~MetaLogical.&lt;init&gt;(java.lang.Class)" resolve="MetaLogical" />
+                    <node concept="3VsKOn" id="6yEjedm9KAr" role="37wK5m">
+                      <ref role="3VsUkX" to="6exd:1bm7a6EXvsP" resolve="DataForm" />
                     </node>
                   </node>
                 </node>
@@ -1944,7 +2247,7 @@
     </node>
     <node concept="2tJIrI" id="1OShD0Ifw9j" role="jymVt" />
     <node concept="3clFb_" id="1OShD0IfETi" role="jymVt">
-      <property role="TrG5h" value="asLogical" />
+      <property role="TrG5h" value="asLogicalTerm" />
       <node concept="37vLTG" id="1OShD0IfFeh" role="3clF46">
         <property role="TrG5h" value="var" />
         <node concept="3uibUv" id="1OShD0IfFfg" role="1tU5fm">
@@ -1964,8 +2267,9 @@
                 <node concept="37vLTw" id="qubcdt9I3r" role="10QFUP">
                   <ref role="3cqZAo" node="1OShD0IfFeh" resolve="var" />
                 </node>
-                <node concept="3uibUv" id="qubcdt9I3s" role="10QFUM">
-                  <ref role="3uigEE" to="bj13:~LogicalOwner" resolve="LogicalOwner" />
+                <node concept="3uibUv" id="3gNap3frn1l" role="10QFUM">
+                  <ref role="3uigEE" to="oy3s:4TCblo5MJ1m" resolve="LogicalDataForm" />
+                  <node concept="3qTvmN" id="3gNap3frn1C" role="11_B2D" />
                 </node>
               </node>
             </node>
@@ -1976,6 +2280,41 @@
         </node>
       </node>
     </node>
+    <node concept="2tJIrI" id="3gNap3g8aYh" role="jymVt" />
+    <node concept="3clFb_" id="3gNap3g8aW5" role="jymVt">
+      <property role="TrG5h" value="asLogicalValue" />
+      <node concept="37vLTG" id="3gNap3g8aW6" role="3clF46">
+        <property role="TrG5h" value="var" />
+        <node concept="3uibUv" id="3gNap3g8aW7" role="1tU5fm">
+          <ref role="3uigEE" to="6exd:uNmovXiEd4" resolve="Variable" />
+        </node>
+      </node>
+      <node concept="3uibUv" id="3gNap3g8aW8" role="3clF45">
+        <ref role="3uigEE" to="bj13:~Logical" resolve="Logical" />
+        <node concept="3qTvmN" id="3gNap3g8aW9" role="11_B2D" />
+      </node>
+      <node concept="3Tm6S6" id="3gNap3g8aWa" role="1B3o_S" />
+      <node concept="3clFbS" id="3gNap3g8aWb" role="3clF47">
+        <node concept="3clFbF" id="3gNap3g8aWc" role="3cqZAp">
+          <node concept="2OqwBi" id="3gNap3g8aWd" role="3clFbG">
+            <node concept="1eOMI4" id="3gNap3g8aWe" role="2Oq$k0">
+              <node concept="10QFUN" id="3gNap3g8aWf" role="1eOMHV">
+                <node concept="37vLTw" id="3gNap3g8aWg" role="10QFUP">
+                  <ref role="3cqZAo" node="3gNap3g8aW6" resolve="var" />
+                </node>
+                <node concept="3uibUv" id="3gNap3g8aWh" role="10QFUM">
+                  <ref role="3uigEE" to="oy3s:3gNap3fN2hw" resolve="LogicalValue" />
+                  <node concept="3qTvmN" id="3gNap3g8aWi" role="11_B2D" />
+                </node>
+              </node>
+            </node>
+            <node concept="liA8E" id="3gNap3g8aWj" role="2OqNvi">
+              <ref role="37wK5l" to="bj13:~LogicalOwner.logical():jetbrains.mps.logic.reactor.logical.Logical" resolve="logical" />
+            </node>
+          </node>
+        </node>
+      </node>
+    </node>
     <node concept="3Tm1VV" id="1OShD0IfsNq" role="1B3o_S" />
     <node concept="3s_gsd" id="1OShD0IfsNr" role="3s_ewO">
       <node concept="3s$Bmu" id="1OShD0IfuGq" role="3s_gse">
@@ -1991,7 +2330,7 @@
                 <ref role="3uigEE" to="6exd:uNmovXiEd4" resolve="Variable" />
               </node>
               <node concept="1rXfSq" id="1OShD0IfHOF" role="33vP2m">
-                <ref role="37wK5l" node="6yEjedm71gQ" resolve="var" />
+                <ref role="37wK5l" node="6yEjedm71gQ" resolve="termvar" />
                 <node concept="Xl_RD" id="1OShD0IfHOG" role="37wK5m">
                   <property role="Xl_RC" value="X" />
                 </node>
@@ -2033,7 +2372,7 @@
                 <ref role="3uigEE" to="6exd:uNmovXiEd4" resolve="Variable" />
               </node>
               <node concept="1rXfSq" id="1OShD0IfHTZ" role="33vP2m">
-                <ref role="37wK5l" node="6yEjedm71gQ" resolve="var" />
+                <ref role="37wK5l" node="6yEjedm71gQ" resolve="termvar" />
                 <node concept="Xl_RD" id="1OShD0IfHU0" role="37wK5m">
                   <property role="Xl_RC" value="Y" />
                 </node>
@@ -2102,7 +2441,7 @@
           <node concept="3vMLTj" id="1OShD0IfHYL" role="3cqZAp">
             <node concept="2OqwBi" id="1OShD0IfItt" role="3tpDZA">
               <node concept="1rXfSq" id="1OShD0IfImD" role="2Oq$k0">
-                <ref role="37wK5l" node="1OShD0IfETi" resolve="asLogical" />
+                <ref role="37wK5l" node="1OShD0IfETi" resolve="asLogicalTerm" />
                 <node concept="37vLTw" id="1OShD0IfIrb" role="37wK5m">
                   <ref role="3cqZAo" node="1OShD0IfHTY" resolve="y" />
                 </node>
@@ -2113,7 +2452,7 @@
             </node>
             <node concept="2OqwBi" id="1OShD0IfI6R" role="3tpDZB">
               <node concept="1rXfSq" id="1OShD0IfI2H" role="2Oq$k0">
-                <ref role="37wK5l" node="1OShD0IfETi" resolve="asLogical" />
+                <ref role="37wK5l" node="1OShD0IfETi" resolve="asLogicalTerm" />
                 <node concept="37vLTw" id="1OShD0IfI4x" role="37wK5m">
                   <ref role="3cqZAo" node="1OShD0IfHOE" resolve="x" />
                 </node>
@@ -2125,6 +2464,153 @@
           </node>
         </node>
       </node>
+      <node concept="3s$Bmu" id="3gNap3g822M" role="3s_gse">
+        <property role="3s$Bm0" value="string_var" />
+        <node concept="3cqZAl" id="3gNap3g822N" role="3clF45" />
+        <node concept="3Tm1VV" id="3gNap3g822O" role="1B3o_S" />
+        <node concept="3clFbS" id="3gNap3g822P" role="3clF47">
+          <node concept="3clFbH" id="3gNap3g822Q" role="3cqZAp" />
+          <node concept="3cpWs8" id="3gNap3g822R" role="3cqZAp">
+            <node concept="3cpWsn" id="3gNap3g822S" role="3cpWs9">
+              <property role="TrG5h" value="x" />
+              <node concept="3uibUv" id="3gNap3g822T" role="1tU5fm">
+                <ref role="3uigEE" to="6exd:uNmovXiEd4" resolve="Variable" />
+              </node>
+              <node concept="1rXfSq" id="3gNap3g822U" role="33vP2m">
+                <ref role="37wK5l" node="3gNap3g7W17" resolve="stringvar" />
+                <node concept="Xl_RD" id="3gNap3g822V" role="37wK5m">
+                  <property role="Xl_RC" value="X" />
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3cpWs8" id="3gNap3g822W" role="3cqZAp">
+            <node concept="3cpWsn" id="3gNap3g822X" role="3cpWs9">
+              <property role="TrG5h" value="a" />
+              <node concept="3uibUv" id="3gNap3g822Y" role="1tU5fm">
+                <ref role="3uigEE" to="6exd:1bm7a6EXvsP" resolve="DataForm" />
+              </node>
+              <node concept="1oi1Uc" id="3gNap3g822Z" role="33vP2m">
+                <node concept="1oi5UN" id="3gNap3g8230" role="1oi0x0">
+                  <node concept="1oi5Wm" id="3gNap3g8235" role="1ojpOf">
+                    <property role="TrG5h" value="name" />
+                    <node concept="1oi5XN" id="3gNap3g8236" role="1oi5zu">
+                      <property role="1oi5yK" value="foo" />
+                    </node>
+                  </node>
+                  <node concept="1oi5Wm" id="3gNap3g85J_" role="1ojpOf">
+                    <property role="TrG5h" value="val" />
+                    <node concept="1oi5XN" id="3gNap3g85JR" role="1oi5zu">
+                      <node concept="22Ky0T" id="3gNap3g85JU" role="lGtFl">
+                        <node concept="37vLTw" id="3gNap3g85Ki" role="22Ky0K">
+                          <ref role="3cqZAo" node="3gNap3g822S" resolve="x" />
+                        </node>
+                      </node>
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3cpWs8" id="3gNap3g8237" role="3cqZAp">
+            <node concept="3cpWsn" id="3gNap3g8238" role="3cpWs9">
+              <property role="TrG5h" value="y" />
+              <node concept="3uibUv" id="3gNap3g8239" role="1tU5fm">
+                <ref role="3uigEE" to="6exd:uNmovXiEd4" resolve="Variable" />
+              </node>
+              <node concept="1rXfSq" id="3gNap3g823a" role="33vP2m">
+                <ref role="37wK5l" node="3gNap3g7W17" resolve="stringvar" />
+                <node concept="Xl_RD" id="3gNap3g823b" role="37wK5m">
+                  <property role="Xl_RC" value="Y" />
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3cpWs8" id="3gNap3g823c" role="3cqZAp">
+            <node concept="3cpWsn" id="3gNap3g823d" role="3cpWs9">
+              <property role="TrG5h" value="b" />
+              <node concept="3uibUv" id="3gNap3g823e" role="1tU5fm">
+                <ref role="3uigEE" to="6exd:1bm7a6EXvsP" resolve="DataForm" />
+              </node>
+              <node concept="1oi1Uc" id="3gNap3g823f" role="33vP2m">
+                <node concept="1oi5UN" id="3gNap3g823g" role="1oi0x0">
+                  <node concept="1oi5Wm" id="3gNap3g823l" role="1ojpOf">
+                    <property role="TrG5h" value="name" />
+                    <node concept="1oi5XN" id="3gNap3g823m" role="1oi5zu">
+                      <property role="1oi5yK" value="foo" />
+                    </node>
+                  </node>
+                  <node concept="1oi5Wm" id="3gNap3g85Ky" role="1ojpOf">
+                    <property role="TrG5h" value="val" />
+                    <node concept="1oi5XN" id="3gNap3g85KC" role="1oi5zu">
+                      <node concept="22Ky0T" id="3gNap3g85KF" role="lGtFl">
+                        <node concept="37vLTw" id="3gNap3g85L3" role="22Ky0K">
+                          <ref role="3cqZAo" node="3gNap3g8238" resolve="y" />
+                        </node>
+                      </node>
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbH" id="3gNap3g823n" role="3cqZAp" />
+          <node concept="3clFbF" id="3gNap3g823o" role="3cqZAp">
+            <node concept="2OqwBi" id="3gNap3g823p" role="3clFbG">
+              <node concept="2OqwBi" id="3gNap3g823q" role="2Oq$k0">
+                <node concept="2YIFZM" id="3gNap3g823r" role="2Oq$k0">
+                  <ref role="1Pybhc" to="w7la:~EvaluationSession" resolve="EvaluationSession" />
+                  <ref role="37wK5l" to="w7la:~EvaluationSession.current():jetbrains.mps.logic.reactor.evaluation.EvaluationSession" resolve="current" />
+                </node>
+                <node concept="liA8E" id="3gNap3g823s" role="2OqNvi">
+                  <ref role="37wK5l" to="w7la:~EvaluationSession.sessionSolver():jetbrains.mps.logic.reactor.evaluation.SessionSolver" resolve="sessionSolver" />
+                </node>
+              </node>
+              <node concept="liA8E" id="3gNap3g823t" role="2OqNvi">
+                <ref role="37wK5l" to="w7la:~SessionSolver.tell(jetbrains.mps.logic.reactor.program.AndItem,jetbrains.mps.logic.reactor.logical.LogicalContext):void" resolve="tell" />
+                <node concept="2YIFZM" id="3gNap3g823u" role="37wK5m">
+                  <ref role="37wK5l" to="cxk7:5jCHAT29qgV" resolve="unifies" />
+                  <ref role="1Pybhc" to="cxk7:2GO7tyJVmP4" resolve="UnificationPredicate" />
+                  <node concept="37vLTw" id="3gNap3g823v" role="37wK5m">
+                    <ref role="3cqZAo" node="3gNap3g822X" resolve="a" />
+                  </node>
+                  <node concept="37vLTw" id="3gNap3g823w" role="37wK5m">
+                    <ref role="3cqZAo" node="3gNap3g823d" resolve="b" />
+                  </node>
+                </node>
+                <node concept="37vLTw" id="3gNap3g823x" role="37wK5m">
+                  <ref role="3cqZAo" node="5jCHAT2dJM2" resolve="NO_CONTEXT" />
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbH" id="3gNap3g823y" role="3cqZAp" />
+          <node concept="3vMLTj" id="3gNap3g823z" role="3cqZAp">
+            <node concept="2OqwBi" id="3gNap3g823$" role="3tpDZA">
+              <node concept="1rXfSq" id="3gNap3g823_" role="2Oq$k0">
+                <ref role="37wK5l" node="3gNap3g8aW5" resolve="asLogicalValue" />
+                <node concept="37vLTw" id="3gNap3g823A" role="37wK5m">
+                  <ref role="3cqZAo" node="3gNap3g8238" resolve="y" />
+                </node>
+              </node>
+              <node concept="liA8E" id="3gNap3g823B" role="2OqNvi">
+                <ref role="37wK5l" to="bj13:~Logical.findRoot():jetbrains.mps.logic.reactor.logical.Logical" resolve="findRoot" />
+              </node>
+            </node>
+            <node concept="2OqwBi" id="3gNap3g823C" role="3tpDZB">
+              <node concept="1rXfSq" id="3gNap3g823D" role="2Oq$k0">
+                <ref role="37wK5l" node="3gNap3g8aW5" resolve="asLogicalValue" />
+                <node concept="37vLTw" id="3gNap3g823E" role="37wK5m">
+                  <ref role="3cqZAo" node="3gNap3g822S" resolve="x" />
+                </node>
+              </node>
+              <node concept="liA8E" id="3gNap3g823F" role="2OqNvi">
+                <ref role="37wK5l" to="bj13:~Logical.findRoot():jetbrains.mps.logic.reactor.logical.Logical" resolve="findRoot" />
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
       <node concept="3s$Bmu" id="kTK1BfxL57" role="3s_gse">
         <property role="3s$Bm0" value="list_values" />
         <node concept="3cqZAl" id="kTK1BfxL58" role="3clF45" />
@@ -2137,7 +2623,7 @@
                 <ref role="3uigEE" to="6exd:uNmovXiEd4" resolve="Variable" />
               </node>
               <node concept="1rXfSq" id="kTK1BfxL5f" role="33vP2m">
-                <ref role="37wK5l" node="6yEjedm71gQ" resolve="var" />
+                <ref role="37wK5l" node="6yEjedm71gQ" resolve="termvar" />
                 <node concept="Xl_RD" id="kTK1BfxL5g" role="37wK5m">
                   <property role="Xl_RC" value="X" />
                 </node>
@@ -2237,7 +2723,7 @@
                 <ref role="3uigEE" to="6exd:uNmovXiEd4" resolve="Variable" />
               </node>
               <node concept="1rXfSq" id="kTK1BfxL5v" role="33vP2m">
-                <ref role="37wK5l" node="6yEjedm71gQ" resolve="var" />
+                <ref role="37wK5l" node="6yEjedm71gQ" resolve="termvar" />
                 <node concept="Xl_RD" id="kTK1BfxL5w" role="37wK5m">
                   <property role="Xl_RC" value="Y" />
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@@ -2335,7 +2821,7 @@
           <node concept="3vMLTj" id="kTK1BfxL5S" role="3cqZAp">
             <node concept="2OqwBi" id="kTK1BfxL5T" role="3tpDZA">
               <node concept="1rXfSq" id="kTK1BfxL5U" role="2Oq$k0">
-                <ref role="37wK5l" node="1OShD0IfETi" resolve="asLogical" />
+                <ref role="37wK5l" node="1OShD0IfETi" resolve="asLogicalTerm" />
                 <node concept="37vLTw" id="kTK1BfxL5V" role="37wK5m">
                   <ref role="3cqZAo" node="kTK1BfxL5t" resolve="y" />
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@@ -2346,7 +2832,7 @@
             </node>
             <node concept="2OqwBi" id="kTK1BfxL5X" role="3tpDZB">
               <node concept="1rXfSq" id="kTK1BfxL5Y" role="2Oq$k0">
-                <ref role="37wK5l" node="1OShD0IfETi" resolve="asLogical" />
+                <ref role="37wK5l" node="1OShD0IfETi" resolve="asLogicalTerm" />
                 <node concept="37vLTw" id="kTK1BfxL5Z" role="37wK5m">
                   <ref role="3cqZAo" node="kTK1BfxL5d" resolve="x" />
                 </node>
@@ -2359,7 +2845,7 @@
         </node>
       </node>
       <node concept="3s$Bmu" id="3HJTsBn4435" role="3s_gse">
-        <property role="3s$Bm0" value="value_var" />
+        <property role="3s$Bm0" value="term_value_var" />
         <node concept="3cqZAl" id="3HJTsBn4436" role="3clF45" />
         <node concept="3Tm1VV" id="3HJTsBn4437" role="1B3o_S" />
         <node concept="3clFbS" id="3HJTsBn4438" role="3clF47">
@@ -2371,7 +2857,7 @@
                 <ref role="3uigEE" to="6exd:uNmovXiEd4" resolve="Variable" />
               </node>
               <node concept="1rXfSq" id="3HJTsBn443d" role="33vP2m">
-                <ref role="37wK5l" node="6yEjedm71gQ" resolve="var" />
+                <ref role="37wK5l" node="6yEjedm71gQ" resolve="termvar" />
                 <node concept="Xl_RD" id="3HJTsBn443e" role="37wK5m">
                   <property role="Xl_RC" value="X" />
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@@ -2476,7 +2962,7 @@
             <node concept="2OqwBi" id="3HJTsBn466i" role="3tpDZA">
               <node concept="2OqwBi" id="3HJTsBn466j" role="2Oq$k0">
                 <node concept="1rXfSq" id="3HJTsBn466k" role="2Oq$k0">
-                  <ref role="37wK5l" node="1OShD0IfETi" resolve="asLogical" />
+                  <ref role="37wK5l" node="1OShD0IfETi" resolve="asLogicalTerm" />
                   <node concept="37vLTw" id="3HJTsBn466l" role="37wK5m">
                     <ref role="3cqZAo" node="3HJTsBn443b" resolve="x" />
                   </node>
@@ -2497,6 +2983,346 @@
           </node>
         </node>
       </node>
+      <node concept="3s$Bmu" id="3gNap3g8en7" role="3s_gse">
+        <property role="3s$Bm0" value="string_value_var" />
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+                      <ref role="3cqZAo" node="3gNap3g8sBq" resolve="c" />
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       <node concept="3s$Bmu" id="kTK1BfyxOp" role="3s_gse">
         <property role="3s$Bm0" value="array_value_var" />
         <node concept="3cqZAl" id="kTK1BfyxOq" role="3clF45" />
@@ -2510,7 +3336,7 @@
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               <node concept="1rXfSq" id="kTK1BfyxOx" role="33vP2m">
-                <ref role="37wK5l" node="6yEjedm71gQ" resolve="var" />
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@@ -2615,7 +3441,7 @@
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@@ -2649,7 +3475,7 @@
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@@ -2848,7 +3674,7 @@
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-                  <ref role="37wK5l" node="1OShD0IfETi" resolve="asLogical" />
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                   <node concept="37vLTw" id="6MYr6Jy8m2V" role="37wK5m">
                     <ref role="3cqZAo" node="4XqG8ivynhL" resolve="x" />
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@@ -2964,7 +3790,7 @@
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               <node concept="1rXfSq" id="1OShD0IfO6I" role="33vP2m">
-                <ref role="37wK5l" node="6yEjedm71gQ" resolve="var" />
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@@ -3006,7 +3832,7 @@
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-                <ref role="37wK5l" node="6yEjedm71gQ" resolve="var" />
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                 <node concept="Xl_RD" id="1OShD0IfP4c" role="37wK5m">
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@@ -3048,7 +3874,7 @@
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-                <ref role="37wK5l" to="6exd:56MMu0Ark7v" resolve="get" />
+                <ref role="37wK5l" to="yt73:~Term.get():jetbrains.mps.unification.Term" resolve="get" />
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@@ -3058,7 +3884,7 @@
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               <node concept="liA8E" id="3mz2_dYyyKx" role="2OqNvi">
-                <ref role="37wK5l" to="6exd:56MMu0Ark7v" resolve="get" />
+                <ref role="37wK5l" to="yt73:~Term.get():jetbrains.mps.unification.Term" resolve="get" />
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@@ -3069,7 +3895,7 @@
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                 <node concept="liA8E" id="3mz2_dYyyKA" role="2OqNvi">
-                  <ref role="37wK5l" to="6exd:56MMu0Ark7v" resolve="get" />
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               </node>
               <node concept="2OqwBi" id="3mz2_dYyyKB" role="3uHU7B">
@@ -3077,7 +3903,7 @@
                   <ref role="3cqZAo" node="1OShD0IfO6H" resolve="x" />
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                 <node concept="liA8E" id="3mz2_dYyyKD" role="2OqNvi">
-                  <ref role="37wK5l" to="6exd:56MMu0Ark7v" resolve="get" />
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@@ -3153,7 +3979,7 @@
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               <node concept="liA8E" id="3mz2_dYyzcE" role="2OqNvi">
-                <ref role="37wK5l" to="6exd:56MMu0Ark7v" resolve="get" />
+                <ref role="37wK5l" to="yt73:~Term.get():jetbrains.mps.unification.Term" resolve="get" />
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             </node>
             <node concept="2OqwBi" id="3mz2_dYyzcF" role="3tpDZA">
@@ -3161,7 +3987,7 @@
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               <node concept="liA8E" id="3mz2_dYyzcH" role="2OqNvi">
-                <ref role="37wK5l" to="6exd:56MMu0Ark7v" resolve="get" />
+                <ref role="37wK5l" to="yt73:~Term.get():jetbrains.mps.unification.Term" resolve="get" />
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             </node>
           </node>
@@ -3275,7 +4101,7 @@
                 <ref role="3uigEE" to="6exd:uNmovXiEd4" resolve="Variable" />
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               <node concept="1rXfSq" id="4XqG8ivylRc" role="33vP2m">
-                <ref role="37wK5l" node="6yEjedm71gQ" resolve="var" />
+                <ref role="37wK5l" node="6yEjedm71gQ" resolve="termvar" />
                 <node concept="Xl_RD" id="4XqG8ivylRd" role="37wK5m">
                   <property role="Xl_RC" value="X" />
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@@ -3318,7 +4144,7 @@
                 <ref role="3uigEE" to="6exd:uNmovXiEd4" resolve="Variable" />
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               <node concept="1rXfSq" id="4XqG8ivylRs" role="33vP2m">
-                <ref role="37wK5l" node="6yEjedm71gQ" resolve="var" />
+                <ref role="37wK5l" node="6yEjedm71gQ" resolve="termvar" />
                 <node concept="Xl_RD" id="4XqG8ivylRt" role="37wK5m">
                   <property role="Xl_RC" value="Y" />
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@@ -3360,7 +4186,7 @@
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               <node concept="liA8E" id="3mz2_dYylmd" role="2OqNvi">
-                <ref role="37wK5l" to="6exd:56MMu0Ark7v" resolve="get" />
+                <ref role="37wK5l" to="yt73:~Term.get():jetbrains.mps.unification.Term" resolve="get" />
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@@ -3370,7 +4196,7 @@
                 <ref role="3cqZAo" node="4XqG8ivylRq" resolve="y" />
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               <node concept="liA8E" id="3mz2_dYylm_" role="2OqNvi">
-                <ref role="37wK5l" to="6exd:56MMu0Ark7v" resolve="get" />
+                <ref role="37wK5l" to="yt73:~Term.get():jetbrains.mps.unification.Term" resolve="get" />
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             </node>
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@@ -3381,7 +4207,7 @@
                   <ref role="3cqZAo" node="4XqG8ivylRq" resolve="y" />
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                 <node concept="liA8E" id="3mz2_dYyuoZ" role="2OqNvi">
-                  <ref role="37wK5l" to="6exd:56MMu0Ark7v" resolve="get" />
+                  <ref role="37wK5l" to="yt73:~Term.get():jetbrains.mps.unification.Term" resolve="get" />
                 </node>
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               <node concept="2OqwBi" id="3mz2_dYyu5J" role="3uHU7B">
@@ -3389,7 +4215,7 @@
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                 <node concept="liA8E" id="3mz2_dYyudo" role="2OqNvi">
-                  <ref role="37wK5l" to="6exd:56MMu0Ark7v" resolve="get" />
+                  <ref role="37wK5l" to="yt73:~Term.get():jetbrains.mps.unification.Term" resolve="get" />
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@@ -3465,7 +4291,7 @@
                 <ref role="3cqZAo" node="4XqG8ivylRa" resolve="x" />
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               <node concept="liA8E" id="3mz2_dYym2e" role="2OqNvi">
-                <ref role="37wK5l" to="6exd:56MMu0Ark7v" resolve="get" />
+                <ref role="37wK5l" to="yt73:~Term.get():jetbrains.mps.unification.Term" resolve="get" />
               </node>
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             <node concept="2OqwBi" id="3mz2_dYymac" role="3tpDZA">
@@ -3473,7 +4299,7 @@
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               <node concept="liA8E" id="3mz2_dYymhu" role="2OqNvi">
-                <ref role="37wK5l" to="6exd:56MMu0Ark7v" resolve="get" />
+                <ref role="37wK5l" to="yt73:~Term.get():jetbrains.mps.unification.Term" resolve="get" />
               </node>
             </node>
           </node>
@@ -3597,7 +4423,7 @@
                 <ref role="3uigEE" to="6exd:uNmovXiEd4" resolve="Variable" />
               </node>
               <node concept="1rXfSq" id="1OShD0IfXUT" role="33vP2m">
-                <ref role="37wK5l" node="6yEjedm71gQ" resolve="var" />
+                <ref role="37wK5l" node="6yEjedm71gQ" resolve="termvar" />
                 <node concept="Xl_RD" id="1OShD0IfXUU" role="37wK5m">
                   <property role="Xl_RC" value="X" />
                 </node>
@@ -3675,7 +4501,7 @@
           <node concept="3vwNmj" id="4$OyT8IVxIx" role="3cqZAp">
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               <node concept="1rXfSq" id="4$OyT8IVxIz" role="2Oq$k0">
-                <ref role="37wK5l" node="1OShD0IfETi" resolve="asLogical" />
+                <ref role="37wK5l" node="1OShD0IfETi" resolve="asLogicalTerm" />
                 <node concept="37vLTw" id="4$OyT8IVxI$" role="37wK5m">
                   <ref role="3cqZAo" node="1OShD0IfXUS" resolve="x" />
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@@ -3818,7 +4644,7 @@
                 <ref role="3uigEE" to="6exd:uNmovXiEd4" resolve="Variable" />
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               <node concept="1rXfSq" id="1OShD0IgkRJ" role="33vP2m">
-                <ref role="37wK5l" node="6yEjedm71gQ" resolve="var" />
+                <ref role="37wK5l" node="6yEjedm71gQ" resolve="termvar" />
                 <node concept="Xl_RD" id="1OShD0IgkRK" role="37wK5m">
                   <property role="Xl_RC" value="X" />
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@@ -3832,7 +4658,7 @@
                 <ref role="3uigEE" to="6exd:uNmovXiEd4" resolve="Variable" />
               </node>
               <node concept="1rXfSq" id="1OShD0IglCC" role="33vP2m">
-                <ref role="37wK5l" node="6yEjedm71gQ" resolve="var" />
+                <ref role="37wK5l" node="6yEjedm71gQ" resolve="termvar" />
                 <node concept="Xl_RD" id="1OShD0IglCD" role="37wK5m">
                   <property role="Xl_RC" value="Y" />
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@@ -3917,7 +4743,7 @@
           <node concept="3vwNmj" id="4$OyT8IVtAi" role="3cqZAp">
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               <node concept="1rXfSq" id="4$OyT8IVtAk" role="2Oq$k0">
-                <ref role="37wK5l" node="1OShD0IfETi" resolve="asLogical" />
+                <ref role="37wK5l" node="1OShD0IfETi" resolve="asLogicalTerm" />
                 <node concept="37vLTw" id="4$OyT8IVtAl" role="37wK5m">
                   <ref role="3cqZAo" node="1OShD0IgkRH" resolve="x" />
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@@ -3930,7 +4756,7 @@
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               <node concept="1rXfSq" id="4$OyT8IVuqD" role="2Oq$k0">
-                <ref role="37wK5l" node="1OShD0IfETi" resolve="asLogical" />
+                <ref role="37wK5l" node="1OShD0IfETi" resolve="asLogicalTerm" />
                 <node concept="37vLTw" id="4$OyT8IVvgk" role="37wK5m">
                   <ref role="3cqZAo" node="1OShD0IglCA" resolve="y" />
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@@ -4187,7 +5013,7 @@
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               <node concept="1rXfSq" id="4$OyT8IVrZJ" role="2Oq$k0">
-                <ref role="37wK5l" node="1OShD0IfETi" resolve="asLogical" />
+                <ref role="37wK5l" node="1OShD0IfETi" resolve="asLogicalTerm" />
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                   <ref role="3cqZAo" node="1OShD0Ig2iN" resolve="x" />
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@@ -4392,7 +5218,7 @@
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               <node concept="1rXfSq" id="4$OyT8IVqqM" role="2Oq$k0">
-                <ref role="37wK5l" node="1OShD0IfETi" resolve="asLogical" />
+                <ref role="37wK5l" node="1OShD0IfETi" resolve="asLogicalTerm" />
                 <node concept="37vLTw" id="4$OyT8IVqqN" role="37wK5m">
                   <ref role="3cqZAo" node="1OShD0IgaBV" resolve="x" />
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@@ -4547,7 +5373,7 @@
           <node concept="3vwNmj" id="4$OyT8IVo6b" role="3cqZAp">
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               <node concept="1rXfSq" id="4$OyT8IVo6d" role="2Oq$k0">
-                <ref role="37wK5l" node="1OShD0IfETi" resolve="asLogical" />
+                <ref role="37wK5l" node="1OShD0IfETi" resolve="asLogicalTerm" />
                 <node concept="37vLTw" id="4$OyT8IVpDX" role="37wK5m">
                   <ref role="3cqZAo" node="1OShD0IgiMd" resolve="x" />
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@@ -4657,7 +5483,7 @@
                 <ref role="3uigEE" to="6exd:uNmovXiEd4" resolve="Variable" />
               </node>
               <node concept="1rXfSq" id="4$OyT8ISnwz" role="33vP2m">
-                <ref role="37wK5l" node="6yEjedm71gQ" resolve="var" />
+                <ref role="37wK5l" node="6yEjedm71gQ" resolve="termvar" />
                 <node concept="Xl_RD" id="4$OyT8ISnw$" role="37wK5m">
                   <property role="Xl_RC" value="HEAD" />
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@@ -4737,7 +5563,7 @@
           <node concept="3vwNmj" id="4$OyT8IVknf" role="3cqZAp">
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               <node concept="1rXfSq" id="4$OyT8IVknh" role="2Oq$k0">
-                <ref role="37wK5l" node="1OShD0IfETi" resolve="asLogical" />
+                <ref role="37wK5l" node="1OShD0IfETi" resolve="asLogicalTerm" />
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                   <ref role="3cqZAo" node="4$OyT8ISnwA" resolve="tail" />
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@@ -5015,7 +5841,7 @@
           <node concept="3vwNmj" id="4$OyT8IV7Cd" role="3cqZAp">
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-                <ref role="37wK5l" node="1OShD0IfETi" resolve="asLogical" />
+                <ref role="37wK5l" node="1OShD0IfETi" resolve="asLogicalTerm" />
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@@ -5057,7 +5883,7 @@
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-                <ref role="37wK5l" node="1OShD0IfETi" resolve="asLogical" />
+                <ref role="37wK5l" node="1OShD0IfETi" resolve="asLogicalTerm" />
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                   <ref role="3cqZAo" node="4$OyT8IUcuk" resolve="tail2" />
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@@ -5205,9 +6031,9 @@
             <node concept="3uibUv" id="3K_0akS$LQx" role="10QFUM">
               <ref role="3uigEE" to="6exd:uNmovXiEd4" resolve="Variable" />
             </node>
-            <node concept="2YIFZM" id="74q$MmRB2bl" role="10QFUP">
-              <ref role="37wK5l" to="7n8k:4TCblo5YI1H" resolve="asVariable" />
-              <ref role="1Pybhc" to="7n8k:677NV565N1x" resolve="LogicalUtil" />
+            <node concept="2YIFZM" id="3gNap3fNlJt" role="10QFUP">
+              <ref role="37wK5l" to="oy3s:4TCblo5YI1H" resolve="asVariable" />
+              <ref role="1Pybhc" to="oy3s:677NV565N1x" resolve="LogicalUtil" />
               <node concept="2ShNRf" id="3K_0akS$LQt" role="37wK5m">
                 <node concept="1pGfFk" id="3K_0akS$LQu" role="2ShVmc">
                   <ref role="37wK5l" to="zx3l:~LogicalImpl.&lt;init&gt;(java.lang.String)" resolve="LogicalImpl" />
@@ -6050,13 +6876,8 @@
               <ref role="3cqZAo" node="3K_0akS$LOk" resolve="unificationSolver" />
             </node>
             <node concept="2ShNRf" id="6yEjedm8fRI" role="37vLTx">
-              <node concept="1pGfFk" id="6yEjedm8fRJ" role="2ShVmc">
-                <ref role="37wK5l" to="mqqo:6yEjedm5WI7" resolve="TestingUnificationSolver" />
-                <node concept="2ShNRf" id="6yEjedm8fRK" role="37wK5m">
-                  <node concept="HV5vD" id="4xTpErjR4MA" role="2ShVmc">
-                    <ref role="HV5vE" to="oy3s:4xTpErjR15$" resolve="DefaultLogicalUnification" />
-                  </node>
-                </node>
+              <node concept="HV5vD" id="3gNap3fFfO1" role="2ShVmc">
+                <ref role="HV5vE" to="mqqo:6yEjedm5WkE" resolve="TestingUnificationSolver" />
               </node>
             </node>
           </node>
@@ -6102,9 +6923,9 @@
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               <ref role="3uigEE" to="6exd:uNmovXiEd4" resolve="Variable" />
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-            <node concept="2YIFZM" id="6N2bvv_ux$_" role="10QFUP">
-              <ref role="37wK5l" to="7n8k:4TCblo5YI1H" resolve="asVariable" />
-              <ref role="1Pybhc" to="7n8k:677NV565N1x" resolve="LogicalUtil" />
+            <node concept="2YIFZM" id="3gNap3fNlJu" role="10QFUP">
+              <ref role="37wK5l" to="oy3s:4TCblo5YI1H" resolve="asVariable" />
+              <ref role="1Pybhc" to="oy3s:677NV565N1x" resolve="LogicalUtil" />
               <node concept="2ShNRf" id="6N2bvv_ux$A" role="37wK5m">
                 <node concept="1pGfFk" id="6N2bvv_ux$B" role="2ShVmc">
                   <ref role="37wK5l" to="zx3l:~LogicalImpl.&lt;init&gt;(java.lang.String)" resolve="LogicalImpl" />
diff --git a/coderules/solutions/jetbrains.mps.typechecking.test/models/jetbrains.mps.typechecking@tests.mps b/coderules/solutions/jetbrains.mps.typechecking.test/models/jetbrains.mps.typechecking@tests.mps
index 412d7b20..634a0b54 100644
--- a/coderules/solutions/jetbrains.mps.typechecking.test/models/jetbrains.mps.typechecking@tests.mps
+++ b/coderules/solutions/jetbrains.mps.typechecking.test/models/jetbrains.mps.typechecking@tests.mps
@@ -2345,13 +2345,8 @@
         <ref role="3uigEE" to="mqqo:6yEjedm5WkE" resolve="TestingUnificationSolver" />
       </node>
       <node concept="2ShNRf" id="fHk0tWuoQm" role="33vP2m">
-        <node concept="1pGfFk" id="fHk0tWutdI" role="2ShVmc">
-          <ref role="37wK5l" to="mqqo:6yEjedm5WI7" resolve="TestingUnificationSolver" />
-          <node concept="2ShNRf" id="6yEjedm5KqE" role="37wK5m">
-            <node concept="HV5vD" id="4xTpErjR48y" role="2ShVmc">
-              <ref role="HV5vE" to="oy3s:4xTpErjR15$" resolve="DefaultLogicalUnification" />
-            </node>
-          </node>
+        <node concept="HV5vD" id="3gNap3fFj93" role="2ShVmc">
+          <ref role="HV5vE" to="mqqo:6yEjedm5WkE" resolve="TestingUnificationSolver" />
         </node>
       </node>
     </node>
@@ -2372,9 +2367,9 @@
             <node concept="3uibUv" id="6N2bvv_ux$$" role="10QFUM">
               <ref role="3uigEE" to="6exd:uNmovXiEd4" resolve="Variable" />
             </node>
-            <node concept="2YIFZM" id="6N2bvv_ux$_" role="10QFUP">
-              <ref role="37wK5l" to="7n8k:4TCblo5YI1H" resolve="asVariable" />
-              <ref role="1Pybhc" to="7n8k:677NV565N1x" resolve="LogicalUtil" />
+            <node concept="2YIFZM" id="3gNap3fNlJl" role="10QFUP">
+              <ref role="37wK5l" to="oy3s:4TCblo5YI1H" resolve="asVariable" />
+              <ref role="1Pybhc" to="oy3s:677NV565N1x" resolve="LogicalUtil" />
               <node concept="2ShNRf" id="6N2bvv_ux$A" role="37wK5m">
                 <node concept="1pGfFk" id="6N2bvv_ux$B" role="2ShVmc">
                   <ref role="37wK5l" to="zx3l:~LogicalImpl.&lt;init&gt;(java.lang.String)" resolve="LogicalImpl" />