Make activity diagram of required scenario for the history of a ticket to a performance. The initial state of a ticket is available state. Before the season starts, seats for season subscribers are assigned. Individual tickets purchased interactively are first locked while the customer makes a selection. After that, they are either sold or unlocked if they are not chosen. If the customer takes too long to make a selection, the transaction times out and the seat is released. Seats sold to season subscribers may be exchanged for other performances, in which case they become available again.
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