How To Use Vowel system In A Sentence

• The monophthongs and diphthongs total 14 vowel sounds, perhaps the smallest vowel system of any long-established variety of English.
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• Proto-Japonic had a four-vowel system */a i u ə/, and the last vowel is not preserved in Proto-Tungusic at all, so I don't see how the 2nd and 3rd vowels could be reconstructed with any more precision. How NOT to reconstruct a protolanguage
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