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Some pages are [[WP:PROT|protected from editing]]. These pages have a <tt>View source</tt> tab instead of an <tt>Edit</tt> tab. You can still edit these pages indirectly, by submitting an "[[Wikipedia:Edit requests|edit request]]" - an editor with the ability to edit the protected page will respond to your request. You can submit a request by clicking on the <tt>View source</tt> tab on that page and using the "Submit an edit request" link at the bottom right.