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  1. main = interact $ show . digital_root . read
  2.  
  3. digital_root = until(<10)$sum.map(read.(:"")).show
Success #stdin #stdout 0s 4784KB
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https://ideone.com/lm3Tma
language:
Haskell (ghc 8.4.4)
created:
7 years ago
visibility:
public

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