|This is a tracking category, a category intended to build and maintain a list of pages primarily for the sake of the list itself. These categories are used to track, for example, pages using deprecated syntaxes, to maintain a list of pages that may need to be edited en masse later, or to aggregate the members of several sub-categories by other classifications into one larger list.
This category lists all of the allbooks categories; an allbooks category is associated with a subject category, and automatically populates all books belonging to that subject or any of its descendants.
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