Assertion: diphthong | /r/HasProperty | rare
Facets:
value: quite
type: DEGREE
Source sentences:
text: The diphthongs [ey̯] and [iy̯] are quite rare and mostly found in derivative words, where a derivational affix starting with /y/ (or properly the vowel harmonic archiphoneme /U/) fuses with the preceding vowel, e.g. pimeys 'darkness' from pimeä 'dark' + /-(U)US/ '