IMAGE DISTRIBUTED FOR GROUPON - Groupon booth is seen at the National Restaurant Association Tradeshow at McCormick Place, on Sunday, May 19, 2013 in Chicago. Groupon highlights the company's marketing and Breadcrumb by Groupon point-of-sale and payments at the tradeshow. (John Konstantaras / AP Images for Groupon)

Associated Press
IMAGE DISTRIBUTED FOR GROUPON - Groupon booth is seen at the National Restaurant Association Tradeshow at McCormick Place, on Sunday, May 19, 2013 in Chicago. Groupon highlights the company's marketing and Breadcrumb by Groupon point-of-sale and payments at the tradeshow. (John Konstantaras / AP Images for Groupon)
IMAGE DISTRIBUTED FOR GROUPON - Groupon booth is seen at the National Restaurant Association Tradeshow at McCormick Place, on Sunday, May 19, 2013 in Chicago. Groupon highlights the company's marketing and Breadcrumb by Groupon point-of-sale and payments at the tradeshow. (John Konstantaras / AP Images for Groupon)
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