HAWTHORNE CA - OCTOBER 09: Elon Musk, CEO of Tesla, unveils the dual engine chassis of the new Tesla 'D' model at the Hawthorne Airport October 09, 2014 in Hawthorne, California. The 'D' is the faster and all-wheel-drive version of the Model S electric sedan, capable of accelerating to 60 miles per hour in just over 3 seconds. (Photo by Kevork Djansezian/Getty Images)
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