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井邊有容量5公升跟3公升的兩個水桶,699Please respect copyright.PENANAUlNailtrNg
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該如何利用這兩個水桶,裝出剛好4公升的水呢?699Please respect copyright.PENANAPlpwYhH0YB
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699Please respect copyright.PENANAGnrHUgLuz3
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