Languages <a href=" http://www.academicpresseurope.nl/?blackness-visible-essays-on-philosophy-and-race ">blackness visible essays on philosophy and race</a> Sudan, the sole conduit for South Sudan's oil exports, saidlast month it would close two cross-border oil pipelines within60 days and insisted output be shut by August 7 unless Juba gaveup its support for the rebels. Juba denies backing them.