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No Plagiarism!XoNCGZOcmBSVWiVwIkr5posted on PENANA
井邊有容量5公升跟3公升的兩個水桶,651Please respect copyright.PENANAC6deVOPiK0
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該如何利用這兩個水桶,裝出剛好4公升的水呢?651Please respect copyright.PENANAmHJlFefOa8
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651Please respect copyright.PENANAIQ8kq7pjsT
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