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I have not found any other mistakes or evidences that the page is written by non-native speaker.[/quote]
I've found another five mistakes, at least.
But I agree, it doesn't look at all being...

Надо же, какие вещи выясняются. )) Но это у вас хорошо придумали, приятно, наверное, осознавать, что твою работу увидят многие. (:
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I rather liked the assignment, actually, since it...

You can't even be sure they're natives. Our final assignment in Russian class last semester was to write a Russian Wikipedia article (vetted by our teacher before being posted, though). :)