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\section{Essential \subsection{Essential  parameters of the Model} The product of the average service time $W_s$ times the average number of customers per minute $\lambda$ is a dimensionless parameter, the \textbf{traffic intensity} $a$, measured in \textit{Erlang}:  \begin{equation}\label{a}  a = W_s \cdot \lambda = \frac{\lambda}{\mu} 
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