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

tongbuyong (通不用)
2001-12-16 -04:00
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Back To Topic: 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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