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FILE - In this Aug. 15, 2008, file photo, Gu Yu of China, left, fights, Veaceslav Gojan of Moldova during a men's bantamweight 54 kilogram preliminary boxing match at the Beijing 2008 Olympics in Beijing. For the first time since 1980, men in Rio de Janeiro will box in the Olympics without wearing headgear. (AP Photo/Rick Bowmer, File)