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'''Categories''' are used in Wikipedia to link articles under a common topic and are found at the bottom of the article page. Clicking the category name displays a list of articles in that category, as well any sub-categories. Categories allow readers to navigate through Wikipedia and find related articles.
==Category tree==
All of the categories form a hierarchy, although sub-categories may be a member of more than one category. An example of a small part of this hierarchical structure is shown:
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