Solution: Flip two of the switches to "ON". After a few minutes, flip "OFF" one of those two switches.
Now, go enter to room. If the light is on, then the switch that is still in the "ON" position controls the light.
If the light is off, go and touch the light bulb. If the bulb is cold, then the switch that was left in the "OFF" position all along will control the light.
If the bulb is warm or hot, then the switch that was flipped "ON", then "OFF", controls the light.
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