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The plain ones usually aren't intended to be used for anything, there should be no bulb behind that, it is unused, you have to remember the world markets, in a different market it may have a different strip for the bulbs.
You need to look at the bulb that goes in thr plain red one, there will be a small white label with a number. That number should match the corresponding number stamped next to the hole where the bulbs fit in, what we are saying is that bulb probably belongs in a different location, one it is where it blongs, things will start to make sense. You might want to check all of them.
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