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halve (xs) | length xs `mod` 2 == 0 = (take n xs, drop n xs) | otherwise = (take (n+1) xs, drop (n+1) xs) where n= length xs `div` 2 main = do putStrLn $ show $ halve [1,2,3,4] putStrLn $ show $ halve [1,2,3]
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