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mc24.hs:10:31:
Couldn't match type `[a0]' with `a -> Integer'
Expected type: (a -> Integer) -> [a] -> t [a]
Actual type: [a0] -> [a0]
In the return type of a call of `take'
Probable cause: `take' is applied to too many arguments
In the expression: take 2
In a stmt of a monad comprehension: then group by x using take 2
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