def b_par_mid
import bendtorch@1.3.0.0/PROOF.bend as PROOFimport Base
import bendtorch@1.3.0.0/main.bend as T
707def b_par_mid(-d: Nat, -gs: T.Halves<T.BG>, -n: Nat, +h: Nat, +dm: T.Dm, r: b_MR<d, gs, n, h, dm>) -> {T.bpar(d, gs, n, h, dm) == T.bleaf(T.hcat(T.BG, gs), h, dm, Nil{}) : List<&1, T.DB>}:
708 match r:
709 case b_MR{ys, sy, f}:
710 b_par_fin(d, gs, n, h, dm, ys, sy, f, b_l1(ys, h, dm, Nil{}))