In this Thursday, Sept. 8, 2016 photo, Joan Lunar Martinez, right, of Spain and his guide Juan Enrique Valles Pastor compete in the men's 400-meter T12 first round, third heat at the 2016 Paralympic Games in Rio de Janeiro, Brazil, on. During the summer Paralympics, guides are used in cycling, equestrian, five-a-side soccer, triathlon and track and field events. (David A. Barnes/University of Georgia via AP)
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