In this Dec. 25, 2015 photo, Karen Quispe prepares to fight another woman, for sport, at the “Takanakuy” ritual fighting event on the outskirts of Lima, Peru on Christmas day. Taking part in the fights is voluntary and no one is obligated to accept a challenge. But by refusing to participate, the challenged party automatically acknowledges the superiority of their rival. (AP Photo/Martin Mejia)

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