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Double-check the URL for typos. Only one mistyped character can result in a 404 error. For example, check whether .htm should be .html or vice versa.
Refresh the webpage. 404 errors might be a momentary glitch.
Search the web. Try to find the page through a web search, since it may have moved to a different URL.
Use another device. It is possible there is a client error or issue with the user's browser. If the page works on another device, clear the first device's cache and cookies.
Go to the Internet Archive's Wayback Machine. Users can access this site to see what a specific URL looked like in the past.
Contact the website owner. Send a note to the website owner so that the link can be fixed.
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