Assertion: diphthong's vowel | /r/HasProperty | written
Facets:
value: commonly
type: DEGREE
Source sentences:
text: In modern-day RP, the starting point of the latter diphthong has become more centralized, and the vowel is commonly written /əʊ/.
text: Spanish diphthongs always have two (written) vowels
text: You already know that Spanish diphthongs always have two written vowels and that you should identify them (open/closed).