items. It takes 2 weeks to make S, 1 week to make T, 2 weeks to make U, 2 weeks to make V, 3 weeks to make W, 2 weeks to make X, 2 weeks to make Y, and 2 weeks to make Z. Click the icon to view the product structure and the time-phased product structure. Construct a gross material requirements plan (type 0 if the input box is not used). The product structure. The time-phased product structure