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The problem with large sites is sometimes the site:domain.com is way off.
Is there a good way to know how much of a site is supplemental for a large site (over 100K pages).
When I'm working with a large site, I find that knowing the actual number of supplemental urls wouldn't usually give me any good action points on its own, at any rate. What I need to do is see patterns in the midst of the reported supplemental results, and address the issue that those patterns suggest.