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The referendum for South Sudan might be done and dusted with almost 99% of the population there voting in favour of separation from the north but many thorny issues remain.

One is the exact demarcation of the border, and how the long traditions of nomadic cattle herders can be accommodated without causing friction.
The BBC's Martin Plaut is in northern Bahr el Ghazal, a southern state along the border with the north.
He asked the state governor, Paul Malong Awan how he would deal with the fact that the border with neighbouring Southern Kordofan state had not been officially demarcated.
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