This category is a placeholder for sub-categories that do not come up, by default, in the Special:Specialpages or Special:Insights listings. For instance, when an editor places a tophat-alert of {{improve}} or {{stub}} - the article gets a category-added... these Category:Needs Improvement or Category:Article stubs markups are a locally-produced extra-category... Thus, this super-category exists to hold these local sub-categories...
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