Consider the following process flow diagram for making a shirt. All steps $($A$,$ B$,$ C$,$ D$,$ and E$)$ are necessary to create each finished unit $($shirt$).$ Each step employs a single worker. Exact task times, in minutes$/$unit$,$ are shown at each step. For example, it takes exactly $4$ minutes to stitch the front and back of the shirt.Consider the following process flow diagram for making a shirt. All steps $($A$,$ B$,$ C$,$ D$,$ and E$)$ are necessary to create each finished unit $($shirt$).$ Each step employs a single worker. Exact task times, in minutes$/$unit$,$ are shown at each step. For example, it takes exactly $4$ minutes to stitch the front and back of the shirt.