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In this file photo combination released by Columbine High school shows 1998 yearbook photos of students Eric Harris, left, and Dylan Klebold, who killed 12 students and a teacher before taking their own lives in what remains the deadliest school attack in U.S. history. Classes are canceled Tuesday, April 20, 2010 at Columbine High School on the anniversary of the 1999 shootings. Twelve students and a teacher died in the shootings before two teenage gunmen committed suicide. (AP Photo/Columbine High School, File)

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