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Jan 17th, 2018
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  1. data M a = M a deriving (Show)
  2. unitM a = M a
  3. bindM (M a) f = f a
  4.  
  5. joinM :: M (M a) -> M a
  6. joinM m = m `bindM` id
  7.  
  8. joinM' :: M a -> a
  9. joinM' m = m `bindM` id
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