 Sean, they would have done what Taiwan did. Very simple. It's a very small inconvenience. They would have boarded every plane from Wuhan. They would have walked up and down the aisle with a temperature that doesn't touch your forehead. Take your temperature. If you had a fever, you'd go into quarantine for two weeks. And then they would contact trace all the people on the airplanes. That prevented it from going into Taiwan for all of 2020. That would have prevented it from going into the U.S.,