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Encyclopedic overview
This is a tracking category. It is used to build and maintain a list or lists of pages—primarily for the sake of the lists themselves and their use in article and category maintenance. It is not part of the encyclopedia's categorization scheme. More information:
This category is hidden on its member pages—unless the corresponding user preference (Appearance → Show hidden categories) is set.
Excerpted from Wikipedia’s “Category:CS1 errors: requires URL” article, available under the CC BY-SA 4.0 licence.