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How do two switches control one light bulb?

Answer

Two switches can control the light bulb by means of three-way switch. These have somewhat difficult wiring diagrams. However, they work in such a way that the circuit can be closed from either end.
Q&A Related to "How do two switches control one light bulb?"
The two switches are both "single pole double throw" type, in which the thrown pole switches back and forth between two conductors. You run two parallel conductors between
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