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November 23, 2010. Chapel Hill, NC..At the UNC Hospital Farmer's Market, Stanley Hughes, a farmer whose family has been in the business for generations, sells 3 types of sweet potatoes, including  (right to left) the Purple 414, the O'Henry White and the Beauregard..   The sweet potato seems to be having a comeback, with many farmers increasing their planting of the potato's numerous varieties, as well as many restaurants including it on their menu in various forms such as the ever popular sweet potato fry.