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When linking to a page, the reason to do so is often to link to the contents of the page. But when the link is archived somewhere, it can last longer than the linked page contents is valid. The result is a link to data over which there is no control. In many cases, it is not possible to easily remove the link at a later time.
In other cases, a page is linked because it is relevant at a given moment, but is not meant to be archived indefinitely.
In these cases, links that expire after some time are useful. You can create these on this page. 
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