Ad. long diphthongs shortened their second vowel; [VV̄] > [V̄V̆]
Reference ✧ SD/423
Phonetic Rule Elements
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Phonetic Rule Examples
zāīn > zāin | VV̄ > V̄V̆ | Ad. †zāyīn > *zāīn > Ad. zâin | ✧ SD/423 |