FILE - In this Thursday, Jan. 17, 2019, file photo, Janelle O'Malley, left, a parent of a student in the Denver Public Schools, hands letters of support for teachers from other parents to Kate Martin, a former teacher and current employee of the Denver Classroom Teachers Association, in the union's headquarters in south Denver. Teachers voted in favor of a strike late Tuesday, Jan. 22, 2019, which would be the first strike called in 25 years in the state's largest school district. (AP Photo/David Zalubowski, File)
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