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mc21.hs:12:26:
Couldn't match type ‘a’ with ‘[a]’
‘a’ is a rigid type variable bound by
a type expected by the context: [a] -> [[a]] at mc21.hs:12:9
Expected type: [a] -> [[a]]
Actual type: [a] -> [a]
In the expression: take 5
In a stmt of a monad comprehension: then group using take 5
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