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import System.IO (getContents)
import Data.Map (fromListWith, toList)
import Data.List (sortBy)
import Data.Ord (comparing)
import Data.Char (toLower, isLetter)
countedWords = toList . fromListWith (+) . map (flip (,) 1)
showTuple (item, count) = "word: " ++ item ++ " count: " ++ show count
normalized = map toLower . filter isLetter
main = getContents >>= mapM_ (putStrLn . showTuple)
. sortBy (flip (comparing snd))
. countedWords
. map normalized
. words
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