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Use the Search Box
Use the search box at the upper right corner of any page to go directly to a page if you know its name, or to find articles that contain a specific phrase. If the phrase you enter is the name of a page, you'll get that. If you instead want a search for all articles containing that phrase, choose the "containing" option that appears below the box.
Note: By default, only the main collection of articles will be searched. This does not include the historical documents (pages whose names begin with "Document:"). You can chose which types of pages to include in your search using the advanced options menu which appears at the top of the search results. You can also change your own default selection for future searches.