This is an administrative category, used for maintenance of the Wikipedia project. It is not part of the encyclopedia and contains non-article pages, or groups articles by status rather than subject. Do not include this category in content categories (except for eponymous maintenance categories).

This is a container category. Due to its scope, it should only contain subcategories.

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• CAT:CAT:
• CAT:CONTCAT:CONT
• CAT:CONTENTSCAT:CONTENTS

This is the top level of Wikipedia's category system. Its subcategories contain various types of encyclopaedic content (i.e. articles), content that assists with the navigation of the encyclopaedia (e.g. portals), as well as pages related to maintaining and collaborating on the encyclopaedia (e.g. Wikipedia administration and WikiProjects). This means there must be NO categories that categorizes this category.