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LONDON, ENGLAND - OCTOBER 20: Olivier Giroud of Arsenal (C) celebrates with Alex Oxlade-Chamberlain (15) and Alexis Sanchez as he scores their first goal during the UEFA Champions League Group F match between Arsenal FC and FC Bayern Munchen at Emirates Stadium on October 20, 2015 in London, United Kingdom. (Photo by Paul Gilham/Getty Images)

LONDON, ENGLAND - OCTOBER 20:  Olivier Giroud of Arsenal (C) celebrates with Alex Oxlade-Chamberlain (15) and Alexis Sanchez as he scores their first goal during the UEFA Champions League Group F match between Arsenal FC and FC Bayern Munchen at Emirates Stadium on October 20, 2015 in London, United Kingdom.  (Photo by Paul Gilham/Getty Images)