A is wrong because U comes after Z. U could go third and be beside Y, if X went before U.
B is wrong because X could go third, after Z and U. There are no rules for X.
C and D are wrong because both W and T can go in 5 or 7. If either goes in 5, then it’s beside Y.
E is CORRECT, because Z has to go before U. U will always be between Z and Y, since Z and U come before Y.
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