You are in a house. In the cellar there are 3 switches which you know are connected, each to one of 3 lights in the attic (which have just been fitted with brand new 100 Watt bulbs from Fred Meyer). Each switch has two labeled positions: "On" and "Off". You are allowed one trip to the Cellar, and one trip to the Attic, can switch the switches in any combination you like, and must be able to say which light is controlled by which switch.
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