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Assume that Product Z is made of two units of A and four units of B. A is made of three units of C and three of D. D is made of three units of E. Lead times for purchase or fabrication of each unit to final assembly are: Z takes two weeks; A, B, C, and D take one week each; and E takes three weeks. Fifty seven units of Product Z are required in Period 10. (Assume that there is currently no inventory on-hand of any of these items.) b. Develop an MRP planning schedule showing gross and net requirements and order release and order receipt dates