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Nigerian President Mohammadu Buhari holds the daughter of the kidnapped Chibok schoolgirl Amina Ali as Borno state governor Kashim Shettima (C) looks on at her arrival at the presidency in Abuja, on May 19, 2016. The first of 219 abducted Chibok schoolgirls to be found after more than two years in Boko Haram captivity on May 19 met Nigeria's President Muhammadu Buhari, with hopes raised more of the girls can be freed. Amina Ali, who was discovered by civilian vigilantes and troops on on May 17, flew from the Borno state capital, Maiduguri, in northeast Nigeria, to the capital, Abuja, with her mother, Binta. / AFP / FLORIAN PLAUCHEUR (Photo credit should read FLORIAN PLAUCHEUR/AFP/Getty Images)

Nigerian President Mohammadu Buhari holds the daughter of the kidnapped Chibok schoolgirl Amina Ali as Borno state governor Kashim Shettima (C) looks on at her arrival at the presidency in Abuja, on May 19, 2016. 
The first of 219 abducted Chibok schoolgirls to be found after more than two years in Boko Haram captivity on May 19 met Nigeria's President Muhammadu Buhari, with hopes raised more of the girls can be freed. Amina Ali, who was discovered by civilian vigilantes and troops on on May 17, flew from the Borno state capital, Maiduguri, in northeast Nigeria, to the capital, Abuja, with her mother, Binta. / AFP / FLORIAN PLAUCHEUR        (Photo credit should read FLORIAN PLAUCHEUR/AFP/Getty Images)