As the production planner for Xiangling Hu$$ Products, Inc., you have been given a bill of material for a bracket that is made up of a$$ base, $2$springs$,$ and $4$ clamps. The base is assembled from $1$ clamp and $2$ housings. Each clamp has $1$ handle and $1$ casting. Each housing has $2$ bearings and $1$ shaft. There is no inventory on hand. In what week do you need to start the$$ castings?