A boat used by refugees and migrants to travel across the Aegean Sea from the Turkish coast in the Greek island of Lesbos is seen at a beach November 21, 2015. Balkan countries have begun filtering the flow of migrants to Europe, granting passage to those fleeing conflict in the Middle East and Afghanistan but turning back others from Africa and Asia, the United Nations and Reuters witnesses said on Thursday. (Photo by Yannis Behrakis/Reuters)
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