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DAMASCUS, SYRIA - JULY 26: Syrian kids having fun at the subterranean playground, which constructed by activists for kids in order not to be affected bombardment of Syrian Regime, in East Gouta of Damascus, Syria on July 26, 2015. (Photo by Ammar Al-Bushy/Anadolu Agency/Getty Images)

DAMASCUS, SYRIA - JULY 26: Syrian kids having fun at the subterranean playground, which constructed by activists for kids in order not to be affected bombardment of Syrian Regime, in East Gouta of Damascus, Syria on July 26, 2015. (Photo by Ammar Al-Bushy/Anadolu Agency/Getty Images)