This is our top-level category - looked at another way, it is our root category! Every other category should be a subcategory of some at least one category and may easily be appropriate in two or three.
Wikipedia categories may be a useful guide and should be copied along with any page that is copied. See project:Copying from Wikipedia.
Every article should be in at least one category for ease of finding by people who know the subject of interest but not the page name.
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