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  1. lst = [[0,1],[2,3],[4,5],[6,7],[8,9]]
  2.  
  3. main = print $ concatMap (filter even) lst
Success #stdin #stdout 0s 5632KB
comments (?)
stdin 
Standard input is empty
stdout 
[0,2,4,6,8]
https://ideone.com/Iu9mxN
language:
Haskell (ghc 8.4.4)
created:
4 years ago
visibility:
secret

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