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FILE - In this Thursday, Jan. 17, 2019, file photograph, a teacher wears a button on a union shirt in the Denver Classroom Teachers Association, the union's headquarters in south Denver. Teachers voted Tuesday, Jan. 22, 2019, to authorize a strike, which would be the first called in 25 years in the state's largest school district. (AP Photo/David Zalubowski, File)

FILE - In this Thursday, Jan. 17, 2019, file photograph, a teacher wears a button on a union shirt in the Denver Classroom Teachers Association, the union's headquarters in south Denver. Teachers voted Tuesday, Jan. 22, 2019, to authorize a strike, which would be the first called in 25 years in the state's largest school district. (AP Photo/David Zalubowski, File)

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