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KUMANOVO, MACEDONIA - SEPTEMBER 07: Refugees cross the border between Macedonia and Serbia, near the town of Kumanovo, Macedonia on September 07, 2015. (Photo by Thomas Campean /Anadolu Agency/Getty Images)

KUMANOVO, MACEDONIA - SEPTEMBER 07: Refugees cross the border between Macedonia and Serbia, near the town of Kumanovo, Macedonia on September 07, 2015. (Photo by Thomas Campean /Anadolu Agency/Getty Images)