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  1. al = ['a'..'z']
  2.  
  3. foo n = length $ iterate (\l -> l >>= \x -> map (:x) al) [[]] !! n
  4.  
  5. main = print $ foo 6
Success #stdin #stdout 2.38s 5724KB
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Standard input is empty
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308915776
https://ideone.com/Go72q7
language:
Haskell (ghc 8.4.4)
created:
7 years ago
visibility:
public

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