One of the bulbs has been 'borrowed' by a sheetrocker: How many trips to the attic do you need to do to be 100% sure which switch operates which bulb?
None! You tell the sheetrocket to go up to the attic and "hold" the empty lampholder up with his finger inside the screwshell.
When you hear a crash and cursing, you know you've found the switch for that light!
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