A windowless room contains three identical light bulbs.
Each light is connected to one of three switches outside of the room.
Each bulb is switched off at present.
You are outside the room, and the door is closed
Before opening the door you may play around with the light switches as many times as you like. But once you've opened the door, you may no longer touch a switch.
After this, you go into the room and examine the lights.
How can you tell which switch goes to which light?
How can you tell which switch goes to which light?
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