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May 31, 2017: Pittsburgh Penguins head coach Mike Sullivan questions a call with referee Dan O'Halloran (13) during game two of the National Hockey League Stanley Cup Finals between the Nashville Predators  and the Pittsburgh Penguins, held at PPG Paints Arena, in Pittsburgh, PA. The Penguins defeat the Predators 4-1 and lead the series 2-0. Eric Canha/CSM