Assertion: diphthong's vowel | /r/HasProperty | i/u
Facets:
Source sentences:
text: Diphthongs with 2 closed vowels (i/u)
text: Diphthongs with 1 open vowel (a/e/o) and 1 closed vowel (i/u)
text: 3 vowels pronounced in the same syllable: (i/u) +