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井邊有容量5公升跟3公升的兩個水桶,728Please respect copyright.PENANAgvybDm0BWn
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該如何利用這兩個水桶,裝出剛好4公升的水呢?728Please respect copyright.PENANAwfy5InDhJD
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728Please respect copyright.PENANAWxPRtdPMAn
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