| 10 Austronesian | 10.2.6.1 Proto-North Sarawak to Kiput | əi̯ əu̯ → ai̯ au̯ / ! O[+voiced] earlier in the word
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| 17 Indo-European | 17.7.2.1.9 Early Northern Middle English to Scots | — əi → aɪ / _{r,F[+voiced],$,#} (pursuant to the above)
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| 38 Tai-Kadai | 38.1.1.3.1 Central Tai to Lungchow | u̯əi uəi uai i̯əu iau → oːi uːi uːiau oːu
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| əi → ai
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| u̯əi → oːi
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| {uəi,uai} iau → uːi eːu
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| 38.1.1.4.2 North Tai to Po-Ai | {əi,ɛi,ei} → ai
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| u̯əi ɔi → (w)iː oːi
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| uəi uai iau → iː oːi eːu
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| 38.1.1.4.3 North Tai to Wu-Ming | əi → ai
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| 38.1.1.5.2 Southwest Tai to Lü | əi → ai
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| 38.1.1.5.3 Southwest Tai to Shan | əi → ai
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| 38.1.1.5.4 Southwest Tai to Siamese | {u̯əi,ɔi} → ɔːi
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| uəi → uai
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| 38.1.1.5.6 Southwest Tai to White Tai | əi → ai
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| 46 Vowel Shifts | 46.5 Old English-to-Scots Vowel Shifts | — əi → aɪ / _{r,F[+voiced],$,#} (pursuant to the above)
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