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No Plagiarism!yOaYV836g60ms1eKsNDfposted on PENANA
井邊有容量5公升跟3公升的兩個水桶,680Please respect copyright.PENANArond39Wu4V
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該如何利用這兩個水桶,裝出剛好4公升的水呢?680Please respect copyright.PENANA3DKBQTToFZ
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680Please respect copyright.PENANAGJPKdUBF3z
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