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Associated Press
IMAGE DISTRIBUTED FOR SHELL - Royal Dutch Shell CEO Peter Voser, left, and the Mayor of Rotterdam, Ahmed Aboutaleb, right, seen during the Shell Energy Lab opening ceremony at the Shell Eco-marathon Challenge Europe at The Ahoy centre in Rotterdam, The Netherlands on Wednesday, May 15, 2013. Teams from universities all over Europe have brought their energy efficient cars to compete through the three-day challenge. (Jiri Buller/AP Images for Shell)

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