ᴱQ. [oi], [ui] became [oij], [uij] before unstressed vowel, [oj], [uj] before stressed vowel; [{ou}iV|{ou}iV́] > [{ou}ijV|{ou}jV́]
References ✧ PE12/12-13
Phonetic Rule Elements
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               > | 
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               ✧ PE12/12 (óı̯- + vowel > oiy-) | 
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               > | 
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               ✧ PE12/12 (úı̯- + vowel > uiy-) | 
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               > | 
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               ✧ PE12/13 (oy-́ > oy-́) | 
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               > | 
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               ✧ PE12/13 (uy-́ > uy-́) |