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1. Why are there no guards on the returned event?
2. Why can we not just add an extra state to show a Book with one copy remaining and so avoid using guards? If you cannot see a reason, try drawing the state diagram that would result.
3. Suppose that you decide to use a protocol state machine to model the behavior of an object. Thus you cannot use actions on the transitions to model an object’s reaction to an event. What UML diagrams, or other techniques, might be useful to model its reaction?