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- printRow h  = 
- printRow h (x:xs) | x>=h = "|" ++ printRow h xs
- | otherwise = " " ++ printRow h xs
- createRow 0 xs = putStr ""
- createRow h xs = putChar '\n' >> putStr (printRow h xs) >> createRow (h-1) xs
- histogram xs = createRow (maximum xs) xs
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