mathtext examples from Bonn

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diff --git a/examples/mathtext/LogicFre.gf b/examples/mathtext/LogicFre.gf
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+concrete LogicFre of Logic = SymbolsX ** LogicI - [Exist] with
+  (LexLogic = LexLogicFre),
+  (Lang = LangFre),
+  (Syntax = SyntaxFre),
+  (Symbolic = SymbolicFre) ** open SyntaxFre in {
+
+lin
+  --- to get the mood of the that clause correct
+  Exist xs A B = 
+    Lang.SSubjS
+    (mkS (mkCl (indef xs.p2 
+      (mkCN such_A (mkCN A xs.p1)))))
+    that_Subj B ;
+
+} ;