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Problem $7-16$

The diagram below represents a process where two components are made at stations A$1$ and A$2($one component is made at A$1$ and the other at A$2).$ These components are then assembled at station B and moved through the rest of the process, where some additional work is completed at stations C$,$ D$,$ and E$.$

Assume that one and only one person is allowed at each station. Assume that the times given below for each station represent the amount of work that needs to be done at that station by that person, with no processing time variation. Assume that inventory is not allowed to build in the system.