| http://www.w3.org/ns/prov#value | - Afua HirschFlying visitIt is being described as the most expensive presidential tour ever, the Obama family's long-awaited visit to east, west and southern Africa will last less than a week but is expected to cost up to $100m (??65m).The busy schedule is made possible by a monumental logistical operation.: instead of relying on local police, hospitals and other facilities, the US is in effect brin
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