 You can use one and then the other and that's it. And that's called a one-stop strategy. You only change once. You can do three or four stops and change between all three if you wanted to. Basically, you've got to get to the finish line quicker than your rivals. And sometimes a few stops to the pit lane and a few quicker stints on those quicker tires will be the way to do that. It's a bit of a chess game going on out in front. To change those tires, you have to pit stop. And nobody does a pit stop.