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Players of Dortmund celebrate after winning the Bundesliga match between Borussia Dortmund and TSG 1899 Hoffenheim at Signal Iduna Park on December 16, 2017 in Dortmund, Germany. Dortmund won 2-1. (Xinhua/Joachim Bywaletz)

Players of Dortmund celebrate after winning the Bundesliga match between Borussia Dortmund and TSG 1899 Hoffenheim at Signal Iduna Park on December 16, 2017 in Dortmund, Germany. Dortmund won 2-1. (Xinhua/Joachim Bywaletz)