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No Plagiarism!uQ01ejtvHhE0Lm97nfLYposted on PENANA
井邊有容量5公升跟3公升的兩個水桶,627Please respect copyright.PENANAqYO9hC4DJ7
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該如何利用這兩個水桶,裝出剛好4公升的水呢?627Please respect copyright.PENANA99oClcEF5F
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627Please respect copyright.PENANA6qxmhLF3Zm
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