Verbs based on root *čiH-
po-čiti
3sg.prs počietъ (je-stem), 2/3sg.aor poči (iH-stem)
Leskien class I
pf aspect
intransitive
prefix variation: vъspo-, ispo-, opo-, otъpo-, po-, prěpo- (pf)
Mikl.: unprefixed čiti in skr., sl.
SJSpo-činǫti
3sg.prs počinetъ (ne-stem), 2/3sg.aor počinǫ (nǫ-stem)
Leskien class II
pf aspect
intransitive
prefix variation: opo-, otъpo-, po-, prěpo- (pf)
SJS gives only a single example, 1sg.aor počinuxъ from a 14th-15th c. source (Job 3:26, alt. with počixъ)
examples in Mikl. are also first from 14th c.
po-čivati
3sg.prs počivaetъ (v-aje-stem), 2/3sg.aor počiva (v-a-stem)
Leskien class III
ipf aspect
intransitive
prefix variation: opo-, otъpo-, po-, prěpo-, upo- (ipf)
SJS
po-koiti
3sg.prs pokoitъ (i-stem), 2/3sg.aor pokoi (i-stem)
Leskien class IV
pf aspect
transitive
arguments: acc/sę
prefix variation: vъspo-, po-, pripo-, prěpo-, prěupo-, u-, upo- (pf)
unprefixed slk. kojiť ʹstillenʹ (ipf.)
a denominal of pokoi in OCS? Mikl. gives ukoiti (ʹsatisfyʹ in slk.), but without a source
Examples in the corpus: počina počiti
full lexicon