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Technically, rel=prev/next doesn't de-duplicate the way the canonical tag does, but it should solve any problems for Google. I don't believe we currently consider rel=prev/next when determining duplicate titles. Klarke is right - you could just give those pages semi-unique titles. We're not handling rel=prev/next as well as we could be (it turns out to be a tricky tag to parse well). Looking at your pages, your implementation appears to be correct. My gut reaction is that your probably ok here. You're doing what Google claims they want (at least what they want this week).