def seq_b3
import bendtorch@1.3.0.0/main.bend as Bendtorchimport Base
782def seq_b3(-P1: Type, -P2: Type, -X: Type, p2: P2, g2: P2, r: Bwd<P1, X>) -> Bwd<Two<P1, P2>, X>:
783 match r:
784 case Bwd{p1, dx, g1}:
785 Bwd{Two{p1, p2}, dx, Two{g1, g2}}