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NYSE Group -- which owns the largest U.S. exchange -- has said it plans to dismiss almost 18 percent of its employees. The group said it would cut around 520 staff following its March takeover of the Archipelago Holdings, an electronic trading platform. NYSE said the move would reduce costs and also eliminate duplicated services. When NYSE became a listed company after the Archipelago deal, chief executive John Thain promised to cut costs by $200 million by the end of 2007.