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From statement I, There are three boxes between T and V. U is two boxes below T. W is above X. W is not the topmost box. Y is neither the topmost box nor the bottommost box.
So, either two or four boxes are below Y.
From statement II, X is two boxes below W. There are two boxes between T and W. T is above X. V is two boxes below U.
Four boxes are below Y.
So, data in statement I alone is not sufficient to answer the question and data in statement II alone is sufficient to answer the question.
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