PS решти rešti (to speak) full e-grade / рѣчь rěčĭ (a speech) lengthened ē-grade
PS ĭ PIE i may also be lengthened to PS i PIE ey
But what type of ablaut is бьрати bĭrati (to gather) / берѫ berǫ (I gather)?
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1Wiktionary says "From Proto-Balto-Slavic *bírāˀtei, from Proto-Indo-European *bʰéreti. The past stem *bьr-a- emerged from zero-grade *br-a- through secondary ablaut." en.wiktionary.org/wiki/Reconstruction:Proto-Slavic/b%D1%8Crati– Vladimir F Героям славаFeb 18, 2021 at 13:22