describe the events that switch internal and external buttons on and off.
Complete the preceding set of events, states, and rules. In particular, describe the events that switch internal and external buttons on and off. Define the policy for canceling external reservations in both interpretations described in Section 5.5.4.2. Warning: You should pay attention to the consistency between the contents of lists and the lighting up of buttons. That is, if an internal button is switched on, the corresponding floor must appear in the elevator’s list. Also, some inconsistency could arise between rule R12 and the policy of switching external buttons off only when the elevator leaves the floor in the desired direction. Why? How can you avoid the risk of inconsistency?
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