Can you figure out how to solve this puzzle?
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ANSWER: Turn on two switches and leave them on for several minutes. Then turn one of them off. When you open the door and look at the light bulbs on the other side, one will still be on. That corresponds with the switch that is still on. The bulb that is off but hot corresponds with the switch that you turned on and then off. And the bulb that is off and still cool is connected to the switch that you didn’t use.