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A special template to be included on all hidden categories.
It will include a description message and the
__HIDDENCAT__ magic word which hides the category and sets it as a child of the category set in MediaWiki:Hidden-category-category.
The template should be included at the top of every hidden category:
This is a hidden category, i.e. it is not displayed at the top of member pages among normal categories.
Users can choose to see hidden categories in a separate "Hidden categories" list by checking "Show hidden categories" in Special:Preferences#Appearance.