def rhd.c1b
import bend-kit-collections@0.1.4.1/nat_order.bend as NatOrderimport Base
611def rhd.c1b(+l: Nat, +x: Nat, +y: Nat, +b: Nat, hd: LE(Nat.mul(2n, b), Nat.add(y, x)), h5: LE(x, Nat.mul(3n, y))) -> LE(b, Nat.mul(3n, y)):
612 by_contra(b, Nat.mul(3n, y), ng => rhd.c1b.k(l, x, y, b, ng, hd, h5))