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Virginia Tech graduate students wave to family and friends while walking in prior to the graduate commencement ceremony at Cassell Coliseum on the campus of Virginia Tech in Blacksburg, Virginia May 11, 2007. On April 16 then Virginia Tech student Seung-Hui Cho killed 32 students and faculty before killing himself in the deadliest shooting in U.S. history . Some 3,600 seniors graduated from Virginia Tech. [Reuters]

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