What do Seung-Hui Cho, Thomas Watt Hamilton, Robert Steinhuser, Charles Joseph Whitman, Tim Kretschmer, Marc Lpine, Dylan Bennet Klebold, Eric David Harris, Farda Gadirov, Bai Ningyang and Walter Seifert have in common?
They carried out massacres at schools
they carried out massacres at schools
they carried out massacres at schools
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They carried out massacres at schools