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Arapahoe students go back to school after shooting
Arapahoe High School students cross the street in front of their school on the first day of classes since a fatal Dec. 13 shooting on campus, in Centennial, Colo., Tuesday Jan. 7, 2014. Students have not attended classes since Karl Pierson, a senior at Arapahoe, entered the school with a shotgun - reportedly with a possible grudge against a teacher - and fatally shot student Claire Davis before killing himself. (AP Photo/Brennan Linsley)

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