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Hold the phone.. Upon further review I think the answer is 9 and here is why. If X is 4 that means that Y has to be 11. If Y is less than Z and both are odd that means that Z has to be 13 and the smallest difference is 9. An odd-even equals an odd. Therefore the smallest difference that is greater than 5 is 7. If Z is a consecutive odd integer that is greater than Y than the answer is 9.