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+{-# LANGUAGE FlexibleInstances #-}
+
+module PrettyPrint where
+
+class PrettyPrint a where
+ prettyPrint :: a -> String
+ -- a = a
+
+instance PrettyPrint String where prettyPrint = id
+instance PrettyPrint Double where prettyPrint = show
+instance PrettyPrint Int where prettyPrint = show