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GELSENKIRCHEN, GERMANY - APRIL 01: The lost red card of referee Felix Zwayer (not pictured) lies on the pitch during the Bundesliga match between FC Schalke 04 and Borussia Dortmund at Veltins-Arena on April 1, 2017 in Gelsenkirchen, Germany. (Photo by Lukas Schulze/Bongarts/Getty Images)

GELSENKIRCHEN, GERMANY - APRIL 01: The lost red card of referee Felix Zwayer (not pictured) lies on the pitch during the Bundesliga match between FC Schalke 04 and Borussia Dortmund at Veltins-Arena on April 1, 2017 in Gelsenkirchen, Germany. (Photo by Lukas Schulze/Bongarts/Getty Images)