def rhd.c1a
import bend-kit-collections@0.1.4.1/nat_order.bend as NatOrderimport Base
593def rhd.c1a(+l: Nat, +x: Nat, +y: Nat, +b: Nat, h1: LE(Nat.add(y, x), Nat.mul(3n, b))) -> LE(y, Nat.mul(3n, b)):
594 by_contra(y, Nat.mul(3n, b), ng => rhd.c1a.k(l, x, y, b, ng, h1))