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You don't want to block duplicate content with robots.txt. Google's guidelines say: Google does not recommend blocking crawler access to duplicate content on your website, whether with a robots.txt file or other methods. If search engines can't crawl pages with duplicate content, they can't automatically detect that these URLs point to the same content ...


If you prevent robots from indexing content, these websites are not considered as duplicate versions, and Google will ignore them. In fact, noindex is usually applied to "print version" of web articles. That's the most similar scenario. In other scenarios, I would suggest to use redirection or canonicalization. For the ads: it depends. You need to read the ...

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