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Ngozi Okonjo-Iweala, right, of Nigeria during the press briefing by African Finance Ministers at the World Bank IMF Spring Meetings in Washington, April 20, 2013.

Ngozi Okonjo-Iweala, right, of Nigeria during the new briefing by African Finance Ministers at the World Bank IMF Spring Meetings in Washington, April 20, 2013.

Kosti Manibe Ngai, Minister of Finance and Economic Planning, South Sudan, sits next to Ngozi Okonjo-Iweala of Nigeria during the press briefing by African Finance Ministers at the World Bank IMF Spring Meetings in Washington, April 20, 2013.

IMF Managing Director Christine Lagarde, left, greets, Ngozi Okonjo-Iweala, Finance Minister of Nigeria, before a meeting of the G-24, during the Spring Meetings of the World Bank Group and the International Monetary Fund.

Ngozi Okonjo-Iweala, right, of Nigeria listens as Alamine Ousmane Mey, Minister of Finance of Cameroon, speaks at the World Bank IMF Spring Meetings in Washington, April 20, 2013.

IMF Managing Director Christine Lagarde, speaks at the Spring Meetings of the World Bank Group and the International Monetary Fund.