Zimbabwean President Robert Mugabe delivers the keynote address during Zimbabwe's 36th Independence Day celebrations in February in Harare. Tsvangirayi Mukwazhi/AP hide caption

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In this 2014 photo, prisoners are closely guarded at Chikurubi Maximum Prison in Harare, Zimbabwe. According to state media, at least 200 male inmates were freed from this prison as a result of President Robert Mugabe's pardons. Tsvangirayi Mukwazhi/AP hide caption

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Zimbabwean President Robert Mugabe eats his cake during Saturday's celebrations to mark his 92nd birthday. Mugabe appears to have no plans to step down as feuding over his successors threatens to tear Zimbabwe's ruling party apart. Tsvangirayi Mukwazhi/AP hide caption

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Zimbabwean President Robert Mugabe went for matching accessories during a February celebration of his 91st birthday. He appears not to be a fan of goats. JEKESAI NJIKIZANA/AFP/Getty Images hide caption

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An old one hundred trillion Zimbabwean dollar note on top of a pile of other old Zimbabwean notes of various denominations in Harare, Thursday. Starting next week, Zimbabweans will be able to exchange their trillions for up to $5 U.S. Tsvangirayi Mukwazhi/AP hide caption

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A Zimbabwean woman casts her ballot at a polling station in Domboshava, 37 miles north of Harare, on Wednesday. Alexander Joe/AFP/Getty Images hide caption

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NPR's Ofeibea Quist-Arcton on Zimbabwean elections

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Zimbabwe's President Robert Mugabe (left) greets South African President Nelson Mandela in Harare, Zimbabwe, in 1998. The two men have shaped their countries in dramatically different ways. Rob Cooper/AP hide caption

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