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→{{header|Haskell}}: Standard operators perhaps now preferable to Control.Arrow ?
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=={{header|Haskell}}==
Short version:
<syntaxhighlight lang="haskell">import Data.List (group, sort)
main :: IO ()
main = interact (show .
or, as an alternative to sorting and grouping the whole string, we could use some kind of container as the accumulator for a single fold, for example:
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