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In reality this isn't a huge issue IF you either get them to provide a snippet of the content (first paragraph) with a link to your article to be able to read more OR you ask them to set your site's content page as canonical. This will show Google that your content is the original version. The chances of getting another site to set up canonical tags just for you are quite frankly slim. Their sites are probably automated and not manually edited. Personally I prefer to write something completely unique on the high profile site.