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Associated Press
IMAGE DISTRIBUTED FOR ALZHEIMER'S ASSOCIATION - From left, actors Simon Helberg, Jim Parsons, Melissa Rauch, Johnny Galecki and Kaley Cuoco, from the cast of "The Big Bang Theory," perform onstage at the 21st Annual 'A Night at Sardi's' to benefit the Alzheimer's Association at the Beverly Hilton Hotel on Wednesday, March 20, 2013 in Beverly Hills, Calif. (Photo by Jordan Strauss/Invision for Alzheimer's Association/AP Images)

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