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philologists, steadily increasing the number of rhyme groups.One of these scholars, Duan Yucai, stated the important principle that characters in the same phonetic series would be in the same rhyme group, making it possible to assign almost all words to rhyme groups.A final revision by Wang Li in the 1930s produced the standard set of 31 rhyme groups.These were used in all reconstructions up to the 1980s, when Zhengzhang Shangfang,

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