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[EOR]
[BOC]
They do all show up at once. The program simply starts with a set number of cars at a gas station and continually refuels them until the timer is up. Also, I am not modeling the problem, this is an assignment and the method I use to solve the problem is the method I have to use.

The car tries for a pump. If none are free, the thread waits until it is notified that a pump is free at which point it checks for pumps again. 
[EOC]
