Students at the Mt. Greenwood Elementary School in Chicago depart after a full day of classes on Monday, Jan. 10, 2022. As hundreds of thousands of Chicago students remained out of school for a fourth day, students at the South Side school were back in classes as the school had enough staff to defy the union's directive to teachers to stay home amid negotiations with the school district over COVID-19 safety protocols. (AP Photo/Charles Rex Arbogast)
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