Demonstrators hold pictures of Santiago Maldonado, right, and Julio Lopez, left, during a protest to demand their appearance in Buenos Aires, Argentina, Monday, September 18, 2017. Julio Lopez disappeared 11 years ago, shortly after being a witness on a trail on crimes against humanity and Santiago Maldonado, who disappeared Aug. 1, 2017. (Photo by Natacha Pisarenko/AP Photo)
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