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井邊有容量5公升跟3公升的兩個水桶,493Please respect copyright.PENANAn7n80M7Yk5
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該如何利用這兩個水桶,裝出剛好4公升的水呢?493Please respect copyright.PENANAZm6jc5TTt1
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493Please respect copyright.PENANALDyVHy92GB
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172.70.126.2
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