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This can be extended to work with 4 switches and one light bulb.

Turn on switches 1 and 2, wait a few minutes, then turn off 1 and turn on 3. QUICKLY go into the room, look at and feel the bulbs.

  • Off, hot: Switch 1
  • On, hot: Switch 2
  • On, cool: Switch 3
  • Off, cool: Switch 4