In this July 30, 2015, file photo, women and children rescued by Nigerian soldiers from the Islamic extremist group Boko Haram in the northeast of Nigeria arrive at the military office in Maiduguri, Nigeria. A video appearing to show proof of life of some of Nigeria's kidnapped Chibok girls was aired, Wednesday, April 13, 2016, along with images of tearful parents recognizing their daughters, unheard of since the mass abduction by the Boko Haram two years ago. (AP Photo/Jossy Ola, File)
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