1. For instance, it has the closed vowel / oe /. 2. The two closed vowels become glides when followed by another vowel. 3. Mongolian also has rounding harmony, which does not apply to close vowels . 4. Men have 2 passaggii for open vowels and one passaggio for closed vowels . 5. This and the long close vowels only occur in word-initial syllables. 6. Intervocalically the aspirated consonants become pre-aspirated unless followed by a closed vowel . 7. #is an allophone of, occurring only before the close vowels ( and ). 8. Vowel length is generally not important : close vowels tend to be longer than open vowels. 9. In the close vowels , the shortened and lengthened vowels remain distinct from originally short and long vowels. 10. :: We are especially talking about open and closed vowels and syntactic gemination, as I said.