Turn one on, leave it for half an hour, turn it off, turn on a second one. Go upstairs.
The first one will be hot, the second will be on, and the third will have never been on.
Turn one on, leave it for half an hour, turn it off, turn on a second one. Go upstairs.
The first one will be hot, the second will be on, and the third will have never been on.
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