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LONDON, ENGLAND - FEBRUARY 22: A fan holds up a sign saying Fake fans during UEFA Europa League Round of 32 match between Arsenal and Ostersunds FK at the Emirates Stadium on February 22, 2018 in London, United Kingdom. (Photo by Catherine Ivill/Getty Images)

LONDON, ENGLAND - FEBRUARY 22: A fan holds up a sign saying Fake fans during UEFA Europa League Round of 32 match between Arsenal and Ostersunds FK at the Emirates Stadium on February 22, 2018 in London, United Kingdom. (Photo by Catherine Ivill/Getty Images)