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$$Bill$\text{'}$s Barbershop has two barbers available to cut$$ customer's hair. Both barbers provide roughly the same experience and$$ skill, but one is just a little bit slower than the other. The process flow below shows that all customers go through steps B$1$ and B$2$ and then can be served at either of the two barbers at step B$3.$ The process ends for all customers at step B$4.$ The numbers in parentheses indicate the minutes it takes that activity to process a customer.