DES - Definition of 'Score'

Score:

The score of event $e$ at time $t$ , denoted $n_e(t)$, is the number of total lifetimes of event $e$ used up to time $t$.

• At time $t$, the score $n_e(t)$ is the index to the current position in the clock sequence of event $e$
• It means that $V_{e,1}$ and $V_{e,2}$ have been used, whereas $V_{e,3}$ has not been used yet.

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~Example: