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Turkish President Recep Tayyip Erdogan, left, welcomes U.S. President Barack Obama, at the G-20 summit in Antalya, Turkey, Sunday, Nov. 15, 2015. President Barack Obama pledged Sunday to redouble U.S. efforts to eliminate the Islamic State group and end the Syrian civil war that has fueled its rise, denouncing the extremist group's horrifying terror spree in Paris as "an attack on the civilized world." (AP Photo/Lefteris Pitarakis)