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No Plagiarism!975pl42aH6lCBgo8jQ4Aposted on PENANA
井邊有容量5公升跟3公升的兩個水桶,698Please respect copyright.PENANArSjqZi7OwI
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該如何利用這兩個水桶,裝出剛好4公升的水呢?698Please respect copyright.PENANAngPikTZKU5
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698Please respect copyright.PENANA6Tzuw0SZpe
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