| IOAut?(IOAut(lstart, lstep, lext)), IOAut?(IOAut(rstart, rstep, rext)), Πok(lext, rext, lren, rren), exec(Π(IOAut(lstart, lstep, lext), IOAut(rstart, rstep, rext), lren, rren))(pσ, pα) ⊦ exec(IOAut(rstart, rstep, rext))(πrs(lstep, rstep, lren, rren, pσ, pα), πra(lstep, rstep, lren, rren, pσ, pα)) |