def aria_d21
import bend-osdev-aria@0.1.0.0/PROOF.bend as PROOFimport Base
import bend-osdev-aria@0.1.0.0/aria.bend as A
6624def aria_d21(+s: A.LcAriaSt) -> {s == A.aria.u21(A.aria.d21(s)) : A.LcAriaSt}:
6625 %aria_e20(A.aria.d20(s)) : {s == A.aria.u20(_) : A.LcAriaSt}
6626 aria_d20(s)