This undated product image provided by McDonald's shows the restaurant's new "Mighty Wings"offering on the store's menu. The world's biggest hamburger chain is set to expand its test of chicken wings to Chicago this week, after a successful run in Atlanta last year. (AP photo/McDonald's)

Associated Press
This undated product image provided by McDonald's shows the restaurant's new "Mighty Wings"offering on the store's menu. The world's biggest hamburger chain is set to expand its test of chicken wings to Chicago this week, after a successful run in Atlanta last year. (AP photo/McDonald's)
This undated product image provided by McDonald's shows the restaurant's new "Mighty Wings"offering on the store's menu. The world's biggest hamburger chain is set to expand its test of chicken wings to Chicago this week, after a successful run in Atlanta last year. (AP photo/McDonald's)
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