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| import Data.List | |
| change :: (Ord a, Num a) => a -> [[a]] | |
| change a = let | |
| coins = [2,3,7] | |
| unique = reverse . nub . reverse | |
| helper a = [ filter (/=0) [x, y, z] | x <- 0 : coins, y <- 0 : coins, z <- 0 : coins, x + y + z == a ] | |
| in unique $ helper a |
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