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SAO PAULO, April 9 (Reuters) - Brazil antitrust regulator Cade ruled on Wednesday that steelmaker Companhia Siderurgica Nacional SA, known as CSN, should reduce its stake in rival Usinas Siderurgicas de Minas Gerais SA.
Preferred shares of Usiminas, as Usinas is known, extended losses to as much as 10 percent after the ruling. (Reporting by Luciana Otoni; Editing by Steve Orlofsky)