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UML-based control system modeling of vehicle seat belt tips. Design requirements: If you do not wear seat belts, red tips vehicle speed is less than 10km/h, the red light does not flash, the buzzer does not sound than 10km/h, red light flashes, the buzzer sound, but more than 5 minutes driving time, the buzzer sound stops, the red light, not blinking. Reversing turned off, wear seat belts, red light off