646 BC

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To a decade: This is a redirect from a year (or years) to to the associated decade article. Years from 1700 to 500 BCE should redirect to the relevant decade per Wikipedia:Timeline standards.
- Do not replace these redirected links with a link directly to the target page. Individual articles may be created for these years in the future.

With possibilities: This is a redirect from a title that potentially could be expanded into a new article or other type of associated page such as a new template. The topic described by this title may be more detailed than is currently provided on the target page or in a section of that page.
- When the target page becomes too large, or for any reason a new page would be an improvement, this redirect may be replaced with an article, template or other project page that is carved out of the target page. See also {{R to section}} and use together with this rcat when appropriate.
- If the topic of the redirect is not susceptible to expansion, then use other rcats such as {{R to section}} or {{R to list entry}} when appropriate.
- Since a new page may be created, links to this redirect should not be replaced with a direct link to the target page. To make redirects to this page, use {{R avoided double redirect}}.
- {{R printworthy}} should be used together with this template when applied to a redirect in mainspace.
- When used on a template redirect, it will automatically populate Category:Template redirects with possibilities.

From a cross-project redirect: This is a redirect from a title linked to an item on Wikidata. The Wikidata item linked to this page is 646 BC (Q1059411).
- Use this template only on hard redirects – for soft redirects use {{Soft redirect with Wikidata item}}.