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If google has crawled and indexed your site thoroughly, you can also do  a site:domain search with a short phrase from the content Moz has identified as duplicate in quotation marks. The results will show you all the pages on your site with that exact phrase.   I like to use a few words at the end of a sentence and a few words at the beginning of the next sentence for this. If google has not indexed all your pages, however, this tactic will not provide you with all the dupe content. So, for example, site:mydomain.com "duplicate content happening. Can someone please"