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井邊有容量5公升跟3公升的兩個水桶,666Please respect copyright.PENANAN3CliQZ32P
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該如何利用這兩個水桶,裝出剛好4公升的水呢?666Please respect copyright.PENANAcdwCq2lUie
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666Please respect copyright.PENANAKoHTsIEpp7
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