Assertion: magazine's feature | /r/HasProperty | coöperate
Facets:
value: in words with repeating vowels
type: OTHER
Source sentences:
text: One uncommonly formal feature of the magazine's in-house style is the placement of diaeresis marks in words with repeating vowels—such as reëlected, preëminent, and coöperate—in which the two vowel letters indicate separate vowel sounds.