Construct a product structure tree (i.e., a BOM chart)

A company produces an end item 'F'. One unit of item "F" can be made by assembling 1 unit of X, 2 units of Y, and 3 units of Z. Each X is made of 2 units of Z and 2 units of A; each Y is assembled using 3 units of B and 1 unit of C. On-hand inventories are 90 units of X and 150 units of Z. Scheduled receipts are 50 units of X at the beginning of week 1, 200 units of Z at the beginning of week 2, and 50 units of C at the beginning of week 1. Lead times for X and C are one week, and lead times for other components are two weeks. Final assembly of F requires one week