exercise 5.10: expression validity and type

05-Lists/exercises/ex5.10.hs

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+Expression              Valid?  Type or issue
+["hello", 42]           No      Mixed types within a list are not permitted
+['h',"ello"]            No      Mixing Char with a list o Char
+['a','b','c']           Yes     [Char]
+length ['w','h','o']    Yes     Int
+length "hello"          Yes     Int
+reverse                 Yes     [a] -> [a]