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U.S. President Barack Obama (R) talks with Russian President Dmitry Medvedev while greeting him at the welcoming dinner for G-20 leaders at the Phipps Conservatory on September 24, 2009 in Pittsburgh, Pennsylvania. Heads of state from the world's leading economic powers arrived today for the two-day G-20 summit held at the David L. Lawrence Convention Center aimed at promoting economic growth UPI/Win McNamee/Pool
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