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After 17 years of conflict costing 300,000 lives, a peace agreement offers new hope to Sudan's troubled Darfur region. It comes as UNAMID, the United Nations and African Union peacekeeping force, prepares to finally pull out at the end of this month. But with nearly two million displaced people still living in camps and some armed groups yet to sign the agreement, who will protect civilians if the peace fails? Mike Thomson reports.