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井邊有容量5公升跟3公升的兩個水桶,731Please respect copyright.PENANAuBTLDd3uCN
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該如何利用這兩個水桶,裝出剛好4公升的水呢?731Please respect copyright.PENANAfOQi8vvTov
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731Please respect copyright.PENANAPSR9yZe3mR
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