Knašta/Third I
The term Third I (Drý-ins Í /dri ɪns i/ in Knašta) is used to describe the realization of the vowel í after ts and at the end of some words. It is called the Third I because the other two phonemes involving an "I-like" vowel (discounting dipthongs) are i /ɪ/ and í /i/.
Location of Third I in Words
The Third I is always written as í, and never as ý, which normally represent the same phoneme (tsí is pronounced /t͡si₃/, while tsý is pronounced /t͡si/). Any í occurring after ts is automatically pronounced as the Third I. An í occurring at the end of the word is also typically pronounced as the Third I.
Examples
Third I's are bolded.
Tsíentsí /t͡si₃ɛnt͡si₃/ (science)
Kapítůlatsíàtsjon /kapitulat͡si₃atsjon/ (surrender)
Agaňí /agaɲi₃/ (again)
Vošní /vɑʃni₃/ (you, singular)
Vrémenskí /vremɛnski₃/ (real)
Realizations of the Third I
The standard pronunciation of the Third I is [e̞], however, it can also be realized as [ɛi̯], [ei̯], and at the end of words [aɪ̯]. These diphthongs are typically seen as having arisen from [e̞].