This Monday, Oct. 15, 2012 photo shows two cans of Caffeine Free Diet Coke on ice in Surfside, Fla. Coca-Cola is expected to report earnings, Tuesday, Feb. 12, 2013. (AP Photo/Wilfredo Lee)

Associated Press
This Monday, Oct. 15, 2012 photo shows two cans of Caffeine Free Diet Coke on ice in Surfside, Fla. Coca-Cola is expected to report earnings, Tuesday, Feb. 12, 2013. (AP Photo/Wilfredo Lee)
This Monday, Oct. 15, 2012 photo shows two cans of Caffeine Free Diet Coke on ice in Surfside, Fla. Coca-Cola is expected to report earnings, Tuesday, Feb. 12, 2013. (AP Photo/Wilfredo Lee)
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