Make it clean
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@@ -37,6 +37,7 @@ elemExp =
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substBrExp :: Exp
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substBrExp :: Exp
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substBrExp =
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substBrExp =
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subst (Variable "if") ifExp .
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subst (Variable "elem") elemExp $ parse
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subst (Variable "elem") elemExp $ parse
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"\\subst. \\var. \\b. case b of \
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"\\subst. \\var. \\b. case b of \
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\ { Branch(c,vs,e') -> if (elem var vs) Branch(c,vs,e') Branch(c,vs, subst e') \
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\ { Branch(c,vs,e') -> if (elem var vs) Branch(c,vs,e') Branch(c,vs, subst e') \
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