This is because Yurok diphthongs are falling diphthongs and behave similarly to nasal and approximates following a vowel and preceding a pause or voiceless non-glottalized consonant.
12.
Nasal vowels, vowels that belong to falling diphthongs, and the high vowels and are not affected by this process, nor is the vowel when written as the digraph.
13.
By the end of the Middle French period, " all " falling diphthongs either monophthongized or switched to rising diphthongs : proto-OF > early OF > modern spelling > mod.
14.
Upsilon participated as the second element in falling diphthongs, which have subsequently developed in various ways : For instance, after alpha or epsilon it is pronounced [ f ] or [ v ] in Modern Greek.
