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I don't have access to the specific content of "Template:Cc-by-sa-2.0" from Wikimedia, so I cannot provide an accurate overview based solely on what you've provided. To write an accurate 2-sentence explanation, I would need to see the actual template content or documentation describing it. If you can share the template's text or description, I'd be happy to create that overview for you.
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This work is licensed under the Creative Commons Attribution-ShareAlike 2.0 License. https://creativecommons.org/licenses/by-sa/2.0/CC-BY-SA-2.0Creative Commons Attribution-ShareAlike 2.0truetrue
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