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Continue to ChatRobots, military and unmanned drones to monitor 2014 World Cup https://chronicle.su/sports/robots-military-and-unmanned-drones-to-monitor-2014-world-cup/
Robots, military and unmanned drones to monitor 2014 World Cup https://chronicle.su/sports/robots-military-and-unmanned-drones-to-monitor-2014-world-cup/