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Brazil's stock exchange operator B3 says revenue service maintains fine over merger

SAO PAULO, Sept 11 (Reuters) - Brazilian stock exchange operator B3 SA said on Wednesday that the country's federal revenue service was maintaining a fine over a 2010-2011 merger, according to a securities filing.

B3 said the tax assessment totaled 2.7 billion reais ($664 million) in June, but that it will still challenge the decision by the tax appeals board in a Brazilian court.

($1 = 4.0661 reais) (Reporting by Carolina Mandl)