Two unidentified Zimbabwean school girls, walk past campaign posters of President Robert Mugabe and the main opposition leader Morgan Tsvangirai, in Harare, Friday, May, 16, 2008. Elections officials say the presidential runoff between President Robert Mugabe and opposition leader Morgan Tsvangirai will be held by July 31, but the opposition has insisted that it should be next week. (AP Photo/Tsvangirayi Mukwazhi)

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