| 21. | The Uyghur vowel system may be subcategorized on the basis of height, backness and roundness.
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| 22. | The vowel system of Ormuri is characterized as heterogenous.
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| 23. | Two-vowel systems are very rare worldwide, but are also found in some Northwest Caucasian languages.
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| 24. | The northern dialect of Tukang Besi has 25 consonant phonemes and a basic 5-vowel system.
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| 25. | There is also a glottal phoneme,', and a three vowel system common in Australian languages.
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| 26. | Regarding phonology, there is also a seven-vowel system but the vowel harmony is not mandatory.
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| 27. | A widely used Roman character-based writing system is the Double Vowel system, attributed to Charles Fiero.
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| 28. | They have fairly simple phonologies and similar vowel systems, both marking length in consonants and vowels.
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| 29. | For most languages, the vowel system is triangular.
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| 30. | The Fas language apparently has a seven-vowel system.
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