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  1. subseq :: [a] -> [[a]]
  2. subseq [] = []
  3. subseq (x:xs) = map (x :) $ subseq xs
  4.  
  5. Prelude> Control.Monad.filterM (n -> [True, False]) [1,2,3]
  6. [[1,2,3],[1,2],[1,3],[1],[2,3],[2],[3],[]]
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