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No Plagiarism!2fy47bwCbSkjbZ72QDLHposted on PENANA
井邊有容量5公升跟3公升的兩個水桶,585Please respect copyright.PENANAYPuIDfZbpk
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該如何利用這兩個水桶,裝出剛好4公升的水呢?585Please respect copyright.PENANAgvNYZVwUdT
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585Please respect copyright.PENANAmMCk9xbdnQ
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