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What is stoppage time? Added time at the World Cup, explained - SBNation.com
FIFA explores use of 4th substitute in extra time | CBC Sports
FIFA Orders World Cup Referees to Add Time at End of Games
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Major League Soccer to allow fourth substitution in extra time of 2017 postseason matches | Seattle Sounders
Football Referee Shows Extra Time, the Soccer Players Change. Stock Vector - Illustration of action, area: 82963199
