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It seems was automatically deleted because of the tag-killing process. But I thought it was used with more than one question.

Have the criteria changed? I can't see any changes in Recent feature changes to Stack Exchange.

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up vote 2 down vote accepted

But I thought it was used with more than one question

Based on some comparisons between the September and December data dumps, it looks like was actually used on two questions, but you edited it out of the second one.

This question is the only other one that I can see that ever had on it, and although I can't guarantee that there wasn't another question posted with that tag between the two data dumps, I'm fairly certain that the system was behaving as expected in this case.

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