| 38 Tai-Kadai | 38.1.1.3 Proto-Tai to Central Tai | ɨ̯a → aː
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| 38.1.1.3.1 Central Tai to Lungchow | uo ɨ̯u → u(ː) u / _C%
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| ɨ̯u → uː
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| uɔ ɨ̯ɔ → oː ɨ
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| {uɨ̯,ua̯,ue̯} → uː
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| ɨ̯ai → aːi
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| 38.1.1.4 Proto-Tai to North Tai | {ɨ̯u,i̯ɛ} → ɨə̯~ɨa̯ / _%
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| ɨ̯a → ɨa̯~ɨə̯
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| ɨ̯ɔ → ɨa~ɨə
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| uɨ̯ ua̯ → ɨə uɔ̯ → ɨː ɔː
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| 38.1.1.4.2 North Tai to Po-Ai | ɨ̯a~ɨə → ɨː
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| ɨ̯ai → ɨːi
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| 38.1.1.5 Proto-Tai to Southwest Tai | ɨ̯a → aː
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| 38.1.1.5.2 Southwest Tai to Lü | {uɨ̯,ua̯,ue̯} {ɨa̯,ɨe̯} ie̯ → o ə e
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| 38.1.1.5.3 Southwest Tai to Shan | {uɨ̯,ua̯,ue̯} {ɨa̯,ɨe̯} ie̯ → o ə e
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| 38.1.1.5.4 Southwest Tai to Siamese | ɨ̯u i̯o → uː u
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| {ɨɔ,ɨ̯ɔ} → ɔː
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| ɨ̯ai → aːi
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| ɨ̯əu au → au aːu
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| 38.1.1.5.6 Southwest Tai to White Tai | {uɨ̯,ua̯,ue̯} {ɨa̯,ɨe̯} ie̯ → o ə e
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