Create an Arena model, a single type of entity with Time Between Arrivals $($TBA$)$ of $1$ minute exponentially distributed.

The entities enter a process where it takes $20$ seconds to grab a pallet. There are $5$ pallets in the system. Then they go to another process where they wait for one of two machine tools to process them. The process time is normally distributed with average of $1$ minute and standard deviation of $0\mathrm{.}1$ minute. Then they go to another process where they release the pallet. Releasing the pallet takes $20$ seconds.

The entities then enter an inspection system that takes $10$ seconds to process them and $90\%$ of them pass terminating their cycle. Ten percent have to return to the beginning of the cycle where they can get the pallet again to be processed.