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Reviewing the arrangement of Yan严 and Fan 凡rhyme groups through the perspective of Sino-Vietnamese

As the rhyme group Yan严 and Fan 凡 are confusingly similar, simultaneously the separation of these two rhyme groups in "Guangyun" (广韵) still raises several questions; there are some scholars who think that the separation of these two rhyme groups in the "Qieyu" (切韵) is unreasonable. Even some scholars consider these two rhyme groups to be inherently the same. The book "Qieyun" divides this rhyme group into two is the case of separation later appeared. However, if we observe these two rhyme groups from a Sino-Vietnamese perspective, we can have a different view. Through a survey of the phonetic transcription, including the archaic and middle sounds of these two rhyme groups in Sino-Vietnamese, we discovered that the two Yan 严 and Fan 凡 are two separated rhyme groups from the corresponding archaic finals which are [ɯɤm] and [uom]. Similar phonetic changing phenomena also occur in Shan 山 and Dang 宕 broad rhyme class. Therefore, through the phonetic changing survey of the two Yan 严, Fan 凡 rhyme groups and the two Shan 山, Dang 宕 broad rhyme classes from ancient Sino-Vietnamese to Sino-Vietnamese, we can prove the two rhyme groups Yan 严, Fan 凡 are two separated rhyme groups, the Yan 严 is the Division III with open mouth, the Fan 凡 is the Division III with closed mouth, the separation of these two rhyme groups in the "Qieyun" is reasonable.