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Pakistani students and civil society activists carry placards as they march during a vigil to pay tribute to the victims of the Peshawar school massacre of December 16, 2014, the deadliest terror attack in Pakistan's history, ahead of the first anniversary, in Lahore on December 15, 2015. As they prepare to mark the first anniversary of a siege that unified the country as never before in its more than decade-long battle against Islamist insurgents, the students, teachers and other staff say it must never be forgotten. AFP PHOTO / ARIF ALI / AFP / Arif Ali (Photo credit should read ARIF ALI/AFP/Getty Images)

Pakistani students and civil society activists carry placards as they march during a vigil to pay tribute to the victims of the Peshawar school massacre of December 16, 2014, the deadliest terror attack in Pakistan's history, ahead of the first anniversary, in Lahore on December 15, 2015. As they prepare to mark the first anniversary of a siege that unified the country as never before in its more than decade-long battle against Islamist insurgents, the students, teachers and other staff say it must never be forgotten. AFP PHOTO / ARIF ALI / AFP / Arif Ali (Photo credit should read ARIF ALI/AFP/Getty Images)
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