The demand for subassembly S is 100 units in week 7. Each unit of S requires 2 units of T and 2 units of U. Each unit of T requires 2 units of V, 1 unit of W, and 2 units of X. Finally, each unit of U requires 1 unit of Y and 3 units of Z. One firm manufactures all items. It takes 2 weeks to make S, 2 weeks to make T, 2 weeks to make U, 1 week to make V, 2 weeks to make W, 2 weeks to make X, 2 weeks to make Y,
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