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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