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Hi Matthew, I think your suggestion is great, as it would instruct google of the fact that I'm aware I have duplicate content, and want to tell him which one should be prioritized. However there are other aspects that would not be fixed in terms of seo that I'd like to get fixed with this "project" If I keep all versions active with this canonical tag, I'm still spreading my incoming link juice through different subdomains, thus minimizing my potential domain authority... For this reason I'm still thinking of making the real big & bold move... which is still giving me goosebumps!