Syrian girls play tic-tac-toe on a train wagon at the northern Greek border point of Idomeni, Greece, on Monday, May 9, 2016. About 54,000 refugees and migrants are currently stranded in Greece as 10,000 are camped in Idomeni, after the European Union and Turkey reached a deal designed to stem the flow of refugees into Europe’s prosperous heartland. (AP Photo/Petros Giannakouris)

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