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No Plagiarism!ufwbx2rSDKYNAK3RL5AXposted on PENANA
井邊有容量5公升跟3公升的兩個水桶,700Please respect copyright.PENANABLXkf7Tusx
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該如何利用這兩個水桶,裝出剛好4公升的水呢?700Please respect copyright.PENANAiul7zc2hFy
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700Please respect copyright.PENANAU6q7x5ujv8
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