1. The simulation traffic light, north and south, east and west four intersections are red yellow and green three color small lamp, the state transition method is as follows, what direction the red light, north and south direction of the green, for 4 seconds, the north and south direction after the green light flashing five times, each time the flashing, a green light on and off time of 0.2 seconds, the north and south direction after the yellow light 1 seconds (this period what direction status has been for the red light), to what direction after the green, north and south direction of the red light, so cycle, requires the use of the timer timing,
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