def b_ffmap
import bendtorch@1.3.0.0/PROOF.bend as PROOFimport Base
import bendtorch@1.3.0.0/main.bend as T
712def b_ffmap(+h: Nat, +dm: T.Dm, xs: List<&1, T.BG>) -> List<&1, T.DB>:
713 match xs:
714 case Nil{}:
715 Nil{}
716 case Con{x, t}:
717 T.db_of(T.bgroups_full(h, 0n, dm, x)) <> b_ffmap(h, dm, t)