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British Prime Minister David Cameron signs the group photo of the G-20 leaders, taken the previous day at the G-20 summit in Antalya on November 16, 2015. AFP PHOTO / POOL (Photo credit should read STR/AFP/Getty Images)

British Prime Minister David Cameron signs the group photo of the G-20 leaders, taken the previous day at the G-20 summit in Antalya on November 16, 2015. AFP PHOTO / POOL        (Photo credit should read STR/AFP/Getty Images)