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2010/6/6 R J :
What's the cleanest definition for a function f :: [a] -> [a] that takes a list and returns the same list, with alternate items removed? e.g., f [0, 1, 2, 3, 4, 5] = [1,3,5]?
f x = [y | (True, y) <- zip (cycle [False, True]) x]
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