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German Social Democrat (SPD) leader Martin Schulz greets supporters during an election rally for Germany's federal elections, which falls on Sept. 24, in Schwerin, northern Germany, on Sept. 15, 2017. (Xinhua/Shan Yuqi)

German Social Democrat (SPD) leader Martin Schulz greets supporters during an election rally for Germany's federal elections, which falls on Sept. 24, in Schwerin, northern Germany, on Sept. 15, 2017. (Xinhua/Shan Yuqi)