That looks like it's an active research problem: https://www.sciencedirect.com/science/article/pii/S2666330924000372 https://www.sciencedirect.com/science/artic

That looks like it's an active research problem: https://www.sciencedirect.com/science/article/pii/S2666330924000372 https://www.sciencedirect.com/science/article/pii/S266633092... At a glance, though, the problem doesn't seem insurmountable. FSW appears to work.