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Nigerian President Mohammadu Buhari speaks with kidnapped Chibok schoolgirl Amina Ali carrying her four-month-old baby 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 / STRINGER (Photo credit should read STRINGER/AFP via Getty Images)

Nigerian President Mohammadu Buhari speaks with kidnapped Chibok schoolgirl Amina Ali carrying her four-month-old baby 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 / STRINGER        (Photo credit should read STRINGER/AFP via Getty Images)