X104: fix45

Given an array, return an array that contains exactly the same numbers as the original array, but rearranged so that every 4 is immediately followed by a 5. Do not move the 4's, but every other number may move. The array contains the same number of 4's and 5's, and every 4 has a number after it that is not a 4. In this version, 5's may appear anywhere in the original array. (This is a slightly harder version of the fix34 problem.)

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