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509: Mainline

Event queues allow you to simulate a sequence of events by way of the following recipe:

*---------------------------* 
| Fetch next element        |<------------------* 
| from the event queue      |                   | 
*---------------------------*                   | 
  |     *---------------------------*           | 
  *-->  | Establish the time        |           | 
        | of the event and perform  |           | 
        | appropriate computations  |           | 
        *---------------------------*           | 
          |     *---------------------------*   | 
          *-->  | Add new elements          | --* 
                | to the event queue        | 
                *---------------------------*