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“People who start playing get strangely addicted,” Jashin Lin said about her obsession with Dance Dance Revolution. Nathan Stodola and Christina Andrade embrace on the couch as Jashin Lin, front right, and Ceili (pronounced Kali) Cornelison, front left, coordinate their foot patterns to match the streaming arrows on the video screen before them in the Mark Twain dormitory. “DDR is a haven for us,” Lin said, “Nerds who like video games and dungeons and dragons.”