In the musky old basement of a decrepit manse of the south, there are three light switches. Each one of these switches corresponds to one of three light bulbs in the attic. There are no windows in the attic, nor any way to see the bulbs in the attic but from within the attic. You may turn the light switches on or off, leaving them in any position you wish. You may only make a single trip up the stairs to the attic from the basement. How do you deduce which light switch corresponds to which light bulb?
Answer
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