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-- Ref: http://goo.gl/L8Fzi
ghci> let keep2 f a b = (f a b, a, b)
ghci> let if' cond x y = if cond then x else y
ghci> let compose2 f g = (f .) . g
ghci> let uncurry3 f = \(a, b, c) -> f a b c
ghci> (uncurry3 if' `compose2` keep2 ((<) `on` length)) [1, 2] [2, 4, 5]
[1,2]
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