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mc19.hs:10:31:
Couldn't match type `a' with `[a]'
`a' is a rigid type variable bound by
a type expected by the context: [a] -> [a] at mc19.hs:10:26
Expected type: [a] -> [a]
Actual type: [a] -> [[a]]
In the expression: inits
In a stmt of a monad comprehension: then inits
In the expression: [x | x <- [3, 2, 1], then inits]
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