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Young Iraqi students look at a fighter from the Popular Mobilisation unit, fighting alongside Iraqi forces against the Islamic State (IS) group, on the first day of the new term outside a primary school in Al-Mazraa village in Iraq's disputed Baiji area on October 18, 2015. Iraqi forces advanced on three fronts against the Islamic State group, flushing out pockets of resistance in and around Baiji and closing in on Ramadi and Hawijah, officers said. AFP PHOTO / AHMAD AL-RUBAYE / AFP / AHMAD AL-RUBAYE (Photo credit should read AHMAD AL-RUBAYE/AFP/Getty Images)

Young Iraqi students look at a fighter from the Popular Mobilisation unit, fighting alongside Iraqi forces against the Islamic State (IS) group, on the first day of the new term outside a primary school in Al-Mazraa village in Iraq's disputed Baiji area on October 18, 2015. Iraqi forces advanced on three fronts against the Islamic State group, flushing out pockets of resistance in and around Baiji and closing in on Ramadi and Hawijah, officers said. AFP PHOTO / AHMAD AL-RUBAYE / AFP / AHMAD AL-RUBAYE        (Photo credit should read AHMAD AL-RUBAYE/AFP/Getty Images)