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Freestyle Powerisers Stilts
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BASE Jumping
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Wing Walking
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Freestyle Motocross
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Aggressive Inline Skating
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Extreme Skiing
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Ice Climbing
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Sky Surfing
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Bungee Jumping
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Skydiving
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Whitewater Kayaking
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http://isidunia.blogspot.com/2010/11/10-olah-raga-paling-extreme-di-dunia.html