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I don't know that there is "structure" that you can implement as far as having categorical pages. However, an easy way to fix this would be to use the canonical tag. Moz defines it as "A canonical tag (aka "rel canonical") is a way of telling search engines that a specific URL represents the master copy of a page. Using the **canonical tag **prevents problems caused by identical or "duplicate" content appearing on multiple URLs." That way you can tell google which of the two you really want them to index. Otherwise you have to change the content enough that google see's it as different content.