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mod47.hs:6:10:
    Could not deduce (Num a)
      arising from the superclasses of an instance declaration
    from the context: (Eq a, Enum a)
      bound by the instance declaration at mod47.hs:6:10-34
    Possible fix:
      add (Num a) to the context of the instance declaration
    In the instance declaration for ‘Bar [a]’