| 11. | Additionally, the liquid is velarized in back vowel contexts.
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| 12. | Vowel harmony states that words may not contain both front and back vowels.
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| 13. | The other tense back vowels have shifted as well.
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| 14. | This also explains why labialization disappears before back vowels.
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| 15. | It also led to the fronting of back vowels after / j /.
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| 16. | Usually, the higher a back vowel, the more intense is the rounding.
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| 17. | Back vowels have low F2 frequencies, while front vowels have high F2 frequencies.
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| 18. | Loaned vowels are considered to be back vowels.
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| 19. | Therefore if a word contains back vowels, neutral vowels may appear alongside them.
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| 20. | These contrast to only a single back vowel.
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