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There are forum posts about how to insert rel="canonical" tags in Wordpress, but I've read about lots of changes in this space recently (updates to Yoast, for example). I'm having a problem with duplicate content on one of my sites, and it seems to be coming from multiple indexes of the same pages.  I'll have a blog post show up under the posts, then the archives, then the tags. So, my question is, in early 2015, what are the current best practices for adding rel="canonical" tags in Wordpress? Thanks! Tim