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PIRAEUS, GREECE - DECEMBER 09: Olivier Giroud celebrates scoring a goal for Arsenal with Aaron Ramsey during the UEFA Champions League Group F match between Olympiacos FC and Arsenal FC at Karaiskakis Stadium on December 9, 2015 in Piraeus, Greece. (Photo by David Price/Arsenal FC via Getty Images)

PIRAEUS, GREECE - DECEMBER 09:  Olivier Giroud celebrates scoring a goal for Arsenal with Aaron Ramsey during the UEFA Champions League Group F match between Olympiacos FC and Arsenal FC at Karaiskakis Stadium on December 9, 2015 in Piraeus, Greece.  (Photo by David Price/Arsenal FC via Getty Images)