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no 惭愧 at all, buring both ends is the key point, which u found also.

tongbuyong(通不用)
(#300829@0)
Last Updated: 2001-12-16
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也出一题， 给你二根导火索， 每根可各燃1小时， 但燃烧速度不一定均匀， based on this, 请测出45分钟来.
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