def aria_dd21
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
6628def aria_dd21(+s: A.LcAriaSt) -> {s == A.aria.d21(A.aria.u21(s)) : A.LcAriaSt}:
6629 %aria_dd20(A.aria.e20(s)) : {s == A.aria.e20(_) : A.LcAriaSt}
6630 aria_e20(s)