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Rebel fighters hold a position on a front line in the Damascus suburb of Yalda on September 18, 2013 in Syria. AFP PHOTO WARD AL-KESWANI (Photo credit should read WARD AL-KESWANI/AFP/Getty Images)

Rebel fighters hold a position on a front line in the Damascus suburb of Yalda on September 18, 2013 in Syria.  AFP PHOTO  WARD AL-KESWANI        (Photo credit should read WARD AL-KESWANI/AFP/Getty Images)