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ALEPPO, SYRIA - DECEMBER 21: Syrians kids play snowballs at a tent city as it snows in the Azaz town of Aleppo, Syria on December 21, 2016. (Photo by Mustafa Sultan/Anadolu Agency/Getty Images)

ALEPPO, SYRIA - DECEMBER 21: Syrians kids play snowballs at a tent city as it snows in the Azaz town of Aleppo, Syria on December 21, 2016. (Photo by Mustafa Sultan/Anadolu Agency/Getty Images)