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module Main where
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allEven :: [Integer] -> [Integer]
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allEven [] = []
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allEven (h:t) = if even h then h:allEven t else allEven t
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allEven2 :: [Integer] -> [Integer]
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allEven2 xs = [x | x <- xs, even x]
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allEven3 :: [Integer] -> [Integer]
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allEven3 = filter even
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-- >>> allEven [1, 2, 3, 4, 5, 6]
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-- [2,4,6]
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-- >>> allEven2 [1, 2, 3, 4, 5, 6]
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-- [2,4,6]
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-- >>> allEven3 [1, 2, 3, 4, 5, 6]
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-- [2,4,6]
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main :: IO()
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main =
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print "yes"
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