Mr Dell and Silver Lake had not disclosed their plans for a turnround, either.

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Approval of the hybrid force for Darfur marks a major turnround for Sudan President Omar al Bashir's government.

NPR: U.N., African Union Unite to End Darfur Violence

Known as the "Sage of Omaha" for his investment success, Mr Buffett has historically left existing management in place, preferring good businesses with what he calls a "moat", a persistent competitive advantage, to prospects for a turnround.

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