[*] 377. Thematic Vowel.—Some tense-stems end in a vowel which varies between ο and ε (or ω and η) in certain forms. This is called the thematic (or variable) vowel. Thus λύ_ο-μεν λύ_ε-τε, λύ_ω-μεν λύ_η-τε, λύ_σο-μεν λύ_σε-τε. The thematic vowel is written όε or ώη, as λυ_όε-, γραφώη-. See 456.
[*] 377. Thematic Vowel.—Some tense-stems end in a vowel which varies between ο and ε (or ω and η) in certain forms. This is called the thematic (or variable) vowel. Thus λύ_ο-μεν λύ_ε-τε, λύ_ω-μεν λύ_η-τε, λύ_σο-μεν λύ_σε-τε. The thematic vowel is written όε or ώη, as λυ_όε-, γραφώη-. See 456.