def both_b3
import bendtorch@1.3.0.0/main.bend as Bendtorchimport Base
2133def both_b3(-P1: Type, -P2: Type, -X1: Type, -X2: Type, p2: P2, g2: P2, dx2: X2, r: Bwd<P1, X1>) -> Bwd<Two<P1, P2>, Two<X1, X2>>:
2134 match r:
2135 case Bwd{p1, dx1, g1}:
2136 Bwd{Two{p1, p2}, Two{dx1, dx2}, Two{g1, g2}}