You are standing outside a closed door. On the other side of the door is a room that has three light bulbs in it. The room is completely sealed off from the outside. It has no windows and nothing can get in or out except through the door. On the outside of the room there are three light switches. Each switch controls a different light bulb inside the room.Your challenge is to work out which light switch controls which light bulb. You are allowed to enter the room only once, and when you come out, you must be able to say with 100% certainty which light switch controls which light bulb.
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