Answer
\begin{array}{l}{\text { Without this instruction, server } S_{i} \text { has finished serving a customer and }} \\ {\text { there are no customers waiting in line, but the next newly arrived cus- }} \\ {\text { tomer will not try to be served by } S_{i} \text { . }}\end{array}
Work Step by Step
\begin{array}{l}{\text { Without this instruction, server } S_{i} \text { has finished serving a customer and }} \\ {\text { there are no customers waiting in line, but the next newly arrived cus- }} \\ {\text { tomer will not try to be served by } S_{i} \text { . }}\end{array}