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Lights and Switches (548)
Instruction:
There are several switches and lightbulbs. Each switch is connected to [exactly] one lightbulb. Each lightbulb is connected to [exactly one switch], and turns on when [that switch is] in the “on” position. It is not known which one of “A” or “B” is the “on” position, and it could be different among different switches.
[What position must the switches be in to turn all the lights on?]
The information in brackets can change from puzzle to puzzle.