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Hello, I am taking some past advise and cleaning up my content navigation to only show 7 tabs as opposed to the 14 currently showing at www.enchantingquotes.com.  I am creating a "Shop by Room" and "Shop by  Category" link, which is what my main competitors do.  My  concern is the duplicate content that will happen since the same item will appear in both categories.  Should I no follow the "Shop by Room" page?  I am confused as to when I should use a no follow as opposed to a canonical tag?  Thank you so much for any advise!