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<link rel="prev" href="/1"If your canonical page is domain root, then the link rel "prev" should point to root, not to "/1".
if your site has a search function and you have a pagination, then again i'm not sure which one to use: canonical or prev-nextIt would be perhaps the best to stop the search URLs via robots.txt. Of course, providing that there are other ways of accessing the product pages.
This is an area where I never quite understood Matt's advice - and I've noticed him give it several times. I've had solid results by using rel="next" etc, and that seems to me to make more sense than twisting rel="canonical" into a rather peculiar application. It may well be something Google can make good use of, however that doesn't make it standard in any way, and I also care about Bing ;)
to point to pages with the same content, or a page which is a superset of the content, not to a different part of the content.