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Photo by: Ptete Muller

Pro-separation activists hold signs and chant pro-independence slogans outside the Juba airport in Southern Sudan, where Sudanese President Omar al-Bashir arrived on Tuesday, Jan. 4, 2011. Southerners will commence voting in an independence referendum on Sunday, the outcome of which will determine whether the south secedes to form the world's newest country. (AP Photo/Pete Muller)

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