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As noted in the Stack ExchangeTerms of Service and in the footer of every page, all publicly accessible user contributions are licensed underCreative Commons Attribution-ShareAlike license as follows:

• Content contributed before 2011-04-08 (UTC) is distributed under the terms ofCC BY-SA 2.5.
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The license applicable for each Question and Answer revision is available on thepost timeline. Seethis post for more information.

Please read the terms of service and the full legal text of the license carefully for more details on how your content can be used and for how you can use publicly accessible content contributed to the site by other users.