When you - you're crack climbing a thin crack, you stick your toes into the crack and then kind of wrench down on to stand up, and it's painful.

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Marion Barry held the office for more than ten years before he was caught on video smoking crack and had to step down.

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As for the other incidents that have beset the type over the past few months -- a fan shaft failure on an engine, an oil leak, a windshield crack -- all can safely be put down to teething problems.

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