1. This vowel system is equivalent to the vowel system reconstructed for Proto-Eastern-Algonquian. 2. The vowel systems of most languages can be represented by vowel diagrams. 3. This has resulted in seven-and nine-vowel systems being the more popular systems. 4. Two different diachronic mechanisms may give rise to a vertical vowel system . 5. This vowel system is equivalent to the vowel system reconstructed for Proto-Eastern-Algonquian. 6. This results in what is probably the most asymmetrical vowel system known. 7. In terms of vowels, Gurindji Kriol has a 5 vowel system . 8. The vowel system of Matses is peculiar in that no vowels are rounded. 9. Tamazight has a phonemic three-vowel system , but also has numerous words without vowels. 10. The vowel system comprises 5 non-ATR vowels and their ATR counterparts.