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In this Sunday, Aug. 24, 2008 file photo German Chancellor Angela Merkel, center, welcomes visitors at the "Day of the open door" during her first term at the Chancellery in Berlin, Germany. Angela Merkel will leave office as one of modern Germany's longest-serving leaders and a global diplomatic heavyweight, with a legacy defined by her management of a succession of crises and whatever the ultimate verdict, Merkel can celebrate a unique end to her tenure: she is set to become the first German chancellor to leave power when she chooses. (AP Photo/Markus Schreiber, File)