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CBS’ annual colorized “I Love Lucy Christmas Special,” which airs this Friday (8-9 p.m.), includes “The Christmas Episode,” originally telecast Dec. 24, 1956. In the episode, told mostly in flashbacks, Lucy and Ricky Ricardo (Lucille Ball, Desi Arnaz) and Fred and Ethel Mertz (William Frawley, Vivian Vance) reminisce about their friendship while Fred trims a...