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+A permutation is an ordered arrangement of objects. For example, 3124 is one possible permutation of the digits 1, 2, 3 and 4. If all of the permutations are listed numerically or alphabetically, we call it lexicographic order. The lexicographic permutations of 0, 1 and 2 are:
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+What is the millionth lexicographic permutation of the digits 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9?
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+solution = read ((permutations [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] |> map (map intToDigit) |> sort) !! 999999)
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