One unit of A is made of two units of B, three units of C and two units of D.B is composed of one unit of E and two units of F. Item A,C,D and F have one week lead time while item B and E have lead time of two weeks. Lot-for-lot (LFL) lot sizing is used for item A, B, C and D. Item E required fixed order quantity (FOQ) of 50 units whereas for item F, the FOQ is 220 . Item D has an inventory of 50 units while the other items have zero inventory. There is a schedule receipt of item E on WW2 with the quantity of 20 units. The schedule shipment until WW10 is summarized in Table Q2. Draw a product structure and prepare material requirement planning for all items