All stems ending in /ɛ/ actually end in the old yat vowel which is pronounced as я (/ja/) or а (/a/) after /ʒ/, /tʃ/ and /ʃ/ in all aorist forms.
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Additionally, after ж (/ʒ/), ч (/tʃ/) and ш (/ʃ/) the stressed yat vowel can be pronounced either as /a/ (as above) or as /ɛ/.
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The verbs (съ-)блекá, влекá, (в-)ля́за and секá have the old yat vowel in the stem, which alternates between я (/ja/) and е (/ɛ/) according to the pronunciation in the eastern dialects.
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3 Since both the vowel о (/o̝/) and the yat vowel are changed to е (/ɛ/), the two forms of the verbal noun are written the same, but pronounced differently, they differ by stress position.
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The verb режа has the yat vowel, which alternates between я (/ja/) and е (/ɛ/).
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