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Associated Press
COMMERCIAL IMAGE - In this photograph taken by AP Images for Shell, Vehicle (11) Gerbille and Vehicle (60) Shark ByonX3, race against each other in the Prototype category, during the competition on day three of the Shell Eco-marathon Challenge Europe at The Ahoy centre in Rotterdam, The Netherlands on Friday, May 18, 2012. Teams from universities all over Europe have brought their energy efficient cars to compete in the challenge. (Ermindo Armino/AP Images for Shell)

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