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A pitch technician works on the pitch of the Stade de lAmitié Sino-gabonaise Stadium in Libreville on January 13, 2017 on the eve of the opening game of the 2017 Africa Cup of Nations football tournament Gabon vs Guinea Bissau. / AFP / GABRIEL BOUYS (Photo credit should read GABRIEL BOUYS/AFP/Getty Images)

A pitch technician works on the pitch of the Stade de lAmitié Sino-gabonaise Stadium in Libreville on January 13, 2017 on the eve of the opening game of the 2017 Africa Cup of Nations football tournament Gabon vs Guinea Bissau. / AFP / GABRIEL BOUYS        (Photo credit should read GABRIEL BOUYS/AFP/Getty Images)