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Semi-protection is sometimes needed to stop vandalism to popular pages. Most pages can be changed by anyone.
The reason for protection can be found in the protection log. If you can not find what you were looking for in the protection log, the page may have been moved after being protected.
You can talk about this page with other users if you have noticed a mistake or have a suggestion for a simple change. Start a new section on this page's talk page and type {{editsemiprotected}} followed by your request. An autoconfirmed user can then make the change for you.