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井邊有容量5公升跟3公升的兩個水桶,631Please respect copyright.PENANA53EyiasSfs
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該如何利用這兩個水桶,裝出剛好4公升的水呢?631Please respect copyright.PENANAwWgFRJxIeD
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631Please respect copyright.PENANAo4qf0EB7Ni
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