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Greg Zelaya, 27, of Dayton, left, Jon Christensen, 25, of Carson City, Clint Hinds, 33, of Carson City, Jacob Avendano, 28, of Dayton and Caleb Jeffers, 19, of Carson City, react during David Hillis' engineering class at  the Carson City, NV campus of Western Nevada College Monday, Oct. 29, 2012.