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Sub-zero temperatures put Chicago into deep freeze
CHICAGO, IL - JANUARY 06: Commuters make a sub-zero trek to offices in the Loop on January 6, 2014 in Chicago, Illinois. Temperatures in the city dipped to -16 degree Fahrenheit this morning on the heals of a polar vortex that has swept into the Midwest bringing with it dangerously cold temperatures not seen in the area in about 20 years. (Photo by Scott Olson/Getty Images)
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