| ⊦ cext !(πra(step, cstep, ren, cren, ⌜pcs '⌝ + ⌜pcsf⌝ , ⌜paf⌝ )) ⊑ aext !(aα) → repla(step, cstep, cren, ren, aren, cext, aext, ⌜pcs '⌝ + ⌜pcsf⌝ , ⌜paf⌝ , aσ, aα) = lim(⌜λ n. ⌜repla(step, cstep, cren, ren, aren, cext, aext, pcs + pcsf.take(n), paf.take(n), aσ, aα)⌝ ⌝ ) |