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HANOVER, GERMANY - APRIL 25: German Chancellor Angela Merkel greets France President Francois Hollande at Schloss Herrenhausen palace upon his arrival for a meeting between U.S. President Barack Obama and western European leaders on April 25, 2016 in Hanover, Germany. Obama is meeting David Cameron of Britain, Francois Hollande of France, Matteo Renzi of Italy and Angela Merkel of Germany. (Photo by Alexander Koerner/Getty Images)