You want a steady stream of base hits to load the bases.

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When U.N. forces took over the Tuzla air base in 1994, it was to be a gateway for a stream of humanitarian aid to the area in northeastern Bosnia.

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Racers follow the stream -- jumping off small cliffs and through waterfalls -- and a final rock face at the base creates one of the last challenges, requiring concentration and crab-walking to climb down.

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