A three$-$machine workcell is controlled such that six jobs are kepy in process at all times. Four part types are produced. When a job is completed, a new job is dispatched to the system. The new job is selected randomly in proportion to the desired relative production rates of the four part types. The table gives demand and processing data. In each operation in the process plan, the data pair contains $($machine$,$ job processing time$).$ Consider an exponential server, single aggregate part, closed queueing network model of the cell.