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US President Barak Obama (C) greets Brazilian President Dilma Rousseff (R) during the G20 Leaders Summit family photo on November 15,2015 in Antalya. Leaders from the world's top 20 industrial powers meet in Turkey from November 15 seeking to overcome differences on a range of issues including the Syria conflict, the refugee crisis and climate change. AFP PHOTO/OZAN KOSE (Photo credit should read OZAN KOSE/AFP/Getty Images)

US President Barak Obama (C) greets Brazilian President Dilma Rousseff (R) during the G20 Leaders Summit family photo on November 15,2015 in Antalya. Leaders from the world's top 20 industrial powers meet in Turkey from November 15 seeking to overcome differences on a range of issues including the Syria conflict, the refugee crisis and climate change. AFP PHOTO/OZAN KOSE        (Photo credit should read OZAN KOSE/AFP/Getty Images)