Free Showtime, HBO and Cinemax Presidents Day Weekend 2/17-2/20 - Dish Customers

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Showtime has a list of many providers, HBO and Cinemax is for Dish customers.
http://www.freepreview.tv/category/showtime
http://www.freepreview.tv/category/hbo
http://www.freepreview.tv/category/cinemax