A harbor light is covered with snow and ice on the Lake Michigan at 39th Street Harbor, Wednesday, Jan. 30, 2019, in Chicago. A deadly arctic deep freeze enveloped the Midwest with record-breaking temperatures on Wednesday, triggering widespread closures of schools and businesses, and prompting the U.S. Postal Service to take the rare step of suspending mail delivery to a wide swath of the region. (AP Photo/Nam Y. Huh)

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