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The three goal-scorers, Arsenal's English midfielder Alex Oxlade-Chamberlain (L), Arsenal's Chilean striker Alexis Sanchez (C) and Arsenal's German midfielder Mesut Ozil (R) celebrate Sanchez's third goal, the team's fifth, during the English Premier League football match between West Ham United and Arsenal at The London Stadium, in east London on December 3, 2016. Arsenal won the game 5-1. / AFP / Justin TALLIS / RESTRICTED TO EDITORIAL USE. No use with unauthorized audio, video, data, fixture lists, club/league logos or 'live' services. Online in-match use limited to 75 images, no video emulation. No use in betting, games or single club/league/player publications. / (Photo credit should read JUSTIN TALLIS/AFP/Getty Images)

The three goal-scorers, Arsenal's English midfielder Alex Oxlade-Chamberlain (L), Arsenal's Chilean striker Alexis Sanchez (C) and Arsenal's German midfielder Mesut Ozil (R) celebrate Sanchez's third goal, the team's fifth, during the English Premier League football match between West Ham United and Arsenal at The London Stadium, in east London on December 3, 2016.
Arsenal won the game 5-1. / AFP / Justin TALLIS / RESTRICTED TO EDITORIAL USE. No use with unauthorized audio, video, data, fixture lists, club/league logos or 'live' services. Online in-match use limited to 75 images, no video emulation. No use in betting, games or single club/league/player publications.  /         (Photo credit should read JUSTIN TALLIS/AFP/Getty Images)