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For years, Chipotle Mexican Grill (NYSE: CMG) defied every logical expectation for an established fast-casual restaurant. In 2014, comparable-store sales (comps) grew 16.8% — an almost unheard-of pace for a company its size. The first half of 2015 was more of the same, with comps up 10.4% and 14.1% during the first and second quarters, respectively.