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Pretend that you are driving a car and your goal is to travel 1000 miles. As a driver you are subject to certain rules of the road. Namely: You can go only when the light is green. You must stop when the light is red. You must obey speed limit signs. If you get a flat tire, you must wait for a spare tire. If you run out of gas, you must for gasoline. If you have an accident, you cannot move again until your car is repaired.