You have three light bulbs inside a windowless room and three switches connected to the light bulbs outside of the room. You need to find out which switches are connected to which lightbulbs; however, you can only enter the room once (and, let's say, only for a brief amount of time).
You need to think outside the box on this one -- no clever contraptions necessary, just make use of the natural properties of light bulbs. Happy thinking!
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