Protesters stand beside trucks blocking the highway in the state of Oaxaca, near the town of Nochixtlan, Mexico, Monday, June 20, 2016. Mexican police say few teachers were involved in violence at a weekend highway protest in the southern state of Oaxaca in which six people died. The teachers are protesting against plans to overhaul the country's education system which include federally mandated teacher evaluations. (AP Photo/Eduardo Verdugo)

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