on the ground floor of a building, you are standing next to a panel with three light switches, which are all in the floor, which has a yellow-light bulb: the light-bulb is operated by one of the switches on the ground floor,but you don't know which one you can only go to the first floor once. How will you figure out which switch operates the light-bulb?
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I on the all switches of light panel and see which button makes the bulb glow
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