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DORTMUND, GERMANY - APRIL 07: Coach of Liverpool Juergen Klopp greets Coach of Dortmund Thomas Tuchel during the UEFA Europa League quarter final first leg match between Borussia Dortmund and Liverpool FC at Signal Iduna Park aka Westfalenstadion on April 7, 2016 in Dortmund, Germany. (Photo by Jean Catuffe/Getty Images)

DORTMUND, GERMANY - APRIL 07: Coach of Liverpool Juergen Klopp greets Coach of Dortmund Thomas Tuchel during the UEFA Europa League quarter final first leg match between Borussia Dortmund and Liverpool FC at Signal Iduna Park aka Westfalenstadion on April 7, 2016 in Dortmund, Germany.  (Photo by Jean Catuffe/Getty Images)