diff --git a/languages/SemAnno.sandbox/models/SimpleExample.mps b/languages/SemAnno.sandbox/models/SimpleExample.mps
deleted file mode 100644
index 99e7900..0000000
--- a/languages/SemAnno.sandbox/models/SimpleExample.mps
+++ /dev/null
@@ -1,115 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<model ref="r:b3d2e5a1-6f9c-482a-9d1c-a5f2c8e1b4a6(SimpleExample)">
-  <persistence version="9" />
-  <languages>
-    <use id="a452e1cf-6f8c-4bca-8447-fd4d6e4d0003" name="SemAnno" version="0" />
-    <use id="ceab5195-25ea-4f22-9b92-103b95ca8c0c" name="jetbrains.mps.lang.core" version="2" />
-  </languages>
-  <imports />
-  <registry>
-    <language id="a452e1cf-6f8c-4bca-8447-fd4d6e4d0003" name="SemAnno">
-      <concept id="8440420766104857128" name="SemAnno.structure.Module" flags="ng" index="2Ks9RF" />
-      <concept id="8440420766104857192" name="SemAnno.structure.Function" flags="ng" index="2Ks9S5" />
-      <concept id="8440420766104857256" name="SemAnno.structure.Parameter" flags="ng" index="2Ks9Tj" />
-      <concept id="8982541288447632700" name="SemAnno.structure.Variable" flags="ng" index="2KtM7O" />
-      <concept id="8982541288447632646" name="SemAnno.structure.Statement" flags="ng" index="2KtLg8" />
-      <concept id="8982541288447632647" name="SemAnno.structure.Block" flags="ng" index="2KtLg9" />
-      <concept id="8982541288447632660" name="SemAnno.structure.Assignment" flags="ng" index="2KtLgs" />
-      <concept id="8982541288447632686" name="SemAnno.structure.IfStatement" flags="ng" index="2KtLhQ" />
-      <concept id="8982541288447632705" name="SemAnno.structure.WhileLoop" flags="ng" index="2KtLiZ" />
-      <concept id="8982541288447632729" name="SemAnno.structure.ForLoop" flags="ng" index="2KtLju" />
-      <concept id="8982541288447632753" name="SemAnno.structure.Return" flags="ng" index="2KtLkJ" />
-      <concept id="8982541288447632765" name="SemAnno.structure.Expression" flags="ng" index="2KtLkV" />
-      <concept id="8982541288447632764" name="SemAnno.structure.BinaryOperation" flags="ng" index="2KtLkU" />
-      <concept id="8982541288447632783" name="SemAnno.structure.UnaryOperation" flags="ng" index="2KtLld" />
-      <concept id="8982541288447632800" name="SemAnno.structure.FunctionCall" flags="ng" index="2KtLmu" />
-      <concept id="8982541288447632817" name="SemAnno.structure.VariableReference" flags="ng" index="2KtLnB" />
-      <concept id="8982541288447632837" name="SemAnno.structure.IntegerLiteral" flags="ng" index="2KtLoP" />
-      <concept id="8982541288447632857" name="SemAnno.structure.FloatLiteral" flags="ng" index="2KtLpd" />
-      <concept id="8982541288447632877" name="SemAnno.structure.StringLiteral" flags="ng" index="2KtLqb" />
-      <concept id="8982541288447632897" name="SemAnno.structure.BooleanLiteral" flags="ng" index="2KtLrZ" />
-      <concept id="8982541288447632917" name="SemAnno.structure.NullLiteral" flags="ng" index="2KtLsX" />
-      <concept id="8982541288447632937" name="SemAnno.structure.ListLiteral" flags="ng" index="2KtLtV" />
-      <concept id="8982541288447632957" name="SemAnno.structure.IndexAccess" flags="ng" index="2KtLuT" />
-      <concept id="8982541288447632977" name="SemAnno.structure.MemberAccess" flags="ng" index="2KtLvR" />
-      <concept id="8982541288447632576" name="SemAnno.structure.Type" flags="ng" index="2KtL_8" />
-      <concept id="8982541288447632596" name="SemAnno.structure.PrimitiveType" flags="ng" index="2KtL_I" />
-      <concept id="8982541288447632616" name="SemAnno.structure.ListType" flags="ng" index="2KtL_W" />
-      <concept id="8982541288447632636" name="SemAnno.structure.MapType" flags="ng" index="2KtL__" />
-      <concept id="8982541288447632656" name="SemAnno.structure.TupleType" flags="ng" index="2KtLaO" />
-      <concept id="8982541288447632676" name="SemAnno.structure.ArrayType" flags="ng" index="2KtLbc" />
-      <concept id="8982541288447632696" name="SemAnno.structure.OptionalType" flags="ng" index="2KtLbq" />
-      <concept id="8982541288447632715" name="SemAnno.structure.CustomType" flags="ng" index="2KtLcE" />
-      <concept id="8982541288447633128" name="SemAnno.structure.Annotation" flags="ng" index="2KtLhc" />
-    </language>
-    <language id="ceab5195-25ea-4f22-9b92-103b95ca8c0c" name="jetbrains.mps.lang.core">
-      <concept id="1169194658468" name="jetbrains.mps.lang.core.structure.INamedConcept" flags="ngI" index="TrEIO">
-        <property id="1169194664001" name="name" index="TrG5h" />
-      </concept>
-    </language>
-  </registry>
-  <node concept="2Ks9RF" id="TE_00001">
-    <property role="TrG5h" value="MathLibrary" />
-    <node concept="2KtM7O" id="TE_00002" role="YUdpP">
-      <property role="TrG5h" value="PI" />
-      <node concept="2KtL_8" id="TE_00003" role="YUdpP">
-        <node concept="2KtL_I" id="TE_00004" role="YUdpP">
-          <property role="TrG5h" value="float" />
-        </node>
-      </node>
-    </node>
-    <node concept="2KtM7O" id="TE_00005" role="YUdpP">
-      <property role="TrG5h" value="E" />
-      <node concept="2KtL_8" id="TE_00006" role="YUdpP">
-        <node concept="2KtL_I" id="TE_00007" role="YUdpP">
-          <property role="TrG5h" value="float" />
-        </node>
-      </node>
-    </node>
-    <node concept="2Ks9S5" id="TE_00008" role="YUdpP">
-      <property role="TrG5h" value="add" />
-      <node concept="2Ks9Tj" id="TE_00009" role="YUdpP">
-        <property role="TrG5h" value="a" />
-        <node concept="2KtL_8" id="TE_00010" role="YUdpP">
-          <node concept="2KtL_I" id="TE_00011" role="YUdpP">
-            <property role="TrG5h" value="int" />
-          </node>
-        </node>
-      </node>
-      <node concept="2Ks9Tj" id="TE_00012" role="YUdpP">
-        <property role="TrG5h" value="b" />
-        <node concept="2KtL_8" id="TE_00013" role="YUdpP">
-          <node concept="2KtL_I" id="TE_00014" role="YUdpP">
-            <property role="TrG5h" value="int" />
-          </node>
-        </node>
-      </node>
-      <node concept="2KtL_8" id="TE_00015" role="YUdpP">
-        <node concept="2KtL_I" id="TE_00016" role="YUdpP">
-          <property role="TrG5h" value="int" />
-        </node>
-      </node>
-      <node concept="2KtLg9" id="TE_00017" role="YUdpP">
-        <node concept="2KtLgs" id="TE_00018" role="YUdpP">
-          <property role="TrG5h" value="result" />
-          <node concept="2KtLkV" id="TE_00019" role="YUdpP">
-            <node concept="2KtLkU" id="TE_00020" role="YUdpP">
-              <property role="TrG5h" value="+" />
-              <node concept="2KtLnB" id="TE_00021" role="YUdpP">
-                <property role="TrG5h" value="a" />
-              </node>
-              <node concept="2KtLnB" id="TE_00022" role="YUdpP">
-                <property role="TrG5h" value="b" />
-              </node>
-            </node>
-          </node>
-        </node>
-        <node concept="2KtLkJ" id="TE_00023" role="YUdpP">
-          <node concept="2KtLnB" id="TE_00024" role="YUdpP">
-            <property role="TrG5h" value="result" />
-          </node>
-        </node>
-      </node>
-    </node>
-  </node>
-</model>