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The CW Network, LLC is an American commercial broadcast television network that is controlled by Nexstar Media Group through a 75-percent ownership interest. The network's name is derived from the first letters of the names of its two founding co-owners CBS Corporation and Warner Bros., with CBS Corporation being merged with the second iteration of Viacom to form ViacomCBS and Warner Bros. being owned by Time Warner, later AT&T's WarnerMedia. Nexstar closed its acquisition of a controlling interest in the network on October 3, 2022, with Paramount Global and Warner Bros. Discovery each retaining a 12.5-percent ownership stake. The CW debuted on September 18, 2006, as the successor to UPN and the WB, which had respectively shut down on September 15 and 17 of that year. The CW's first two nights of programming – on September 18, 2006, and September 19, 2006 – consisted of reruns and launch-related specials. The CW marked its formal launch date on September 20, 2006, with the two-hour premiere of the seventh cycle of America's Next Top Model. The network's programming lineup is intended to appeal mainly to viewers between the ages of 18 and 34, although from 2008 to 2011, the network shifted its programming to appeal to women in that demographic. As of August 2017, the network's audience was evenly split between men and women. The CW runs programming seven days a week: airing nightly in prime time, along with a Saturday morning live-action educational programming block produced by Hearst Media Production Group called One Magnificent Morning. The CW is also available in southern Canada on pay television providers through stations owned-and-operated by Nexstar and on affiliates owned by others that are located within proximity to the Canada–United States border; it is also available through two Nexstar-controlled stations that are classified in the United States as superstations – New York City-based de facto flagship WPIX and Los Angeles-based secondary flagship KTLA. Additionally, the network is available in northern Mexico through affiliates located near the Mexico–U.S. border on pay television providers. In both Canada and Mexico, some free-to-air CW affiliate signals originating from the U.S. are receivable over-the-air in border areas depending on the station's signal coverage.