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A man hugs a girl on December 3, 2015, after refugees and migrants arrived on the Greek island of Lesbos after crossing the Aegean Sea from Turkey. More than 886,000 migrants have arrived in Europe by sea so far this year, according to the latest UN figures. / AFP / ARIS MESSINIS (Photo credit should read ARIS MESSINIS/AFP/Getty Images)

A man hugs a girl on December 3, 2015, after refugees and migrants arrived  on the Greek island of Lesbos after crossing the Aegean Sea from Turkey.
More than 886,000 migrants have arrived in Europe by sea so far this year, according to the latest UN figures. / AFP / ARIS MESSINIS        (Photo credit should read ARIS MESSINIS/AFP/Getty Images)