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ADVANCE FOR USE SUNDAY, MARCH 9 AND THEREAFTER - In this Feb. 20, 2014 photo, U.S. Postal Service letter carrier Gary Keist prepares to make a delivery to a home in Normal, Ill. Keist, 56, began as a letter carrier in 1978 and said this winter is the worst he's ever worked because of the consistent pattern of snowfalls followed by bitterly cold temperatures with little or no break. (AP Photo/The Pantagraph, Steve Smedley)

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