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Cambridge Elementary School crossing guard Rosa Navarro helps students and parents across busy Lacey Lane on the first day of classes on Monday, Aug. 25, 2014, in Concord, Calif. (Jim Stevens/Bay Area News Group)

Cambridge Elementary School crossing guard Rosa Navarro, above, helps students and parents get across busy Lacey Lane on the first day of classes in the Mt. Diablo School District on Monday, Aug. 25. Principal Jose Espinoza, left, high-fives a student arriving on campus after the summer break.

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