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Haskell 99 Problems - Number 14

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problem 14, Duplicate the elements of a list
> dupli [1, 2, 3]
[1,1,2,2,3,3]

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  1. dupli :: [a] -> [a]
  2. dupli = concatMap (replicate 2)

URL: http://haskell.org/haskellwiki/99_questions/11_to_20

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