1. Use knowledge to design a traffic light control system. 2. The power of the north-south direction when the red light 25 seconds east-west direction of the green light is 20 seconds, two seconds the green light flash seconds, three seconds flashing yellow light seconds. East-west direction and then the next 25 seconds the red light the green north-south direction and 20 seconds, two seconds the green light flash seconds, three seconds flashing yellow light seconds. Such a cycle.

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