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Classic Football Shirts on Twitter: "Nike La Liga Ball 2017/18 ⚽ 34 goals for the season for Messi and a 50th career hat-trick for Ronaldo. 🏷️ Grab yourself a size 5 Nike
How is the color of a referee's uniform defined, in soccer matches, when they aren't wearing all black? - Quora
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Mark Clattenburg leaves Premier League to 'educate' Saudi Arabia referees | Mark Clattenburg | The Guardian
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