A sign at a store advertises the Powerball Lottery in Oklahoma City, Friday, May 17, 2013. Powerball officials say the jackpot has climbed to an estimated $600 million, making it the largest prize in the game's history and the world's second largest lottery prize. (AP Photo/Sue Ogrocki)

Associated Press
A sign at a store advertises the Powerball Lottery in Oklahoma City, Friday, May 17, 2013. Powerball officials say the jackpot has climbed to an estimated $600 million, making it the largest prize in the game's history and the world's second largest lottery prize. (AP Photo/Sue Ogrocki)
A sign at a store advertises the Powerball Lottery in Oklahoma City, Friday, May 17, 2013. Powerball officials say the jackpot has climbed to an estimated $600 million, making it the largest prize in the game's history and the world's second largest lottery prize. (AP Photo/Sue Ogrocki)
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