ABC words: Difference between revisions
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→{{header|Haskell}}
(Updated Haskell version) |
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=={{header|Haskell}}==
<lang haskell>import Data.
import Data.Maybe (isJust)
Line 1,592:
residue 'a' "bc" s
>>= residue 'b' "c"
>>=
residue :: Char -> String -> String -> Maybe String
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