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An American flag flies outside a Dollar General Corp. store in Scottsville, Kentucky, U.S., on Tuesday, May 26, 2015. Dollar General Corp. is expected to report quarterly earnings results on June 2. Photographer: Luke Sharrett/Bloomberg via Getty Images

An American flag flies outside a Dollar General Corp. store in Scottsville, Kentucky, U.S., on Tuesday, May 26, 2015. Dollar General Corp. is expected to report quarterly earnings results on June 2. Photographer: Luke Sharrett/Bloomberg via Getty Images