Category Intersection Query
From QED
For the purposes of category queries, each category is viewed as the set of articles and media files which have been placed in the category or one of its subcategories, or one of theirs, etc.
Select one or more categories from the menu and then press the Go button. An index page with links to the pages and files that are each in all the selected categories will then be generated. The index page also includes a gallery of images that are in all the selected categories.
To add a category to your selection, or to deselect a category, hold down the Control key while clicking the left mouse button. For further guidance, see Help:Keyboard.
The number in parentheses after each category name is the number of pages that are in the category itself (excluding subcategories).
