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Easy, you turn one light on, leave it on for 10 min, then turn it off. Turn another light on and go inside. You know which switch works the light that is on (you left it on), and you can find the bulb which is warm out of the two that are off, so you know which bulb was on for 10 minutes prior. This of course assumes incandescent bulbs, although I suppose it would work to a lesser degree w/ halogens.
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