$15.$ Consider line $1in$ Table $9\mathrm{.}4.$ Assume batches $of$ six jobs arrive every $35$ hours with $no$ variability $in$ the arrivals, the setup times, $or$ the process times. Construct a Gantt chart $(i.e.,$ time line$)$ like that $in$ Figure $9\mathrm{.}5$ for the system when the stations are permuted from the original order $(1,2,3)as$ follows:

$(a)1,3,2$

$(b)2,1,3$

$(c)2,3,1$

$(d)3,1,2$

Compute the average cycle time for each.