FILE - In this Friday, May 29, 2015 file photo, Nigerian President elect, Muhammadu Buhari, arrives for his Inauguration at the eagle square in Abuja, Nigeria. Shocked by a deadly new series of extremist attacks on soldiers, Nigeria's president on Wednesday Nov. 28, 2018, backed off past declarations that Boko Haram has been defeated and urged the military to "rise to the challenge." (AP Photo/Sunday Alamba, File)
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