Don't hit the stuff that's thereall right? And you pretty riht forward, don't crash into things, try toe things. That's it. This comes from the experience that the team has of understanding this class of problems. Sa, we're to explain all the data we get. Now, say that's exhaustand we might be wrong about that. It might be somebody, whatever reason, looks like exhaust. But we're going to have done our work to explain all the different parts of the syst all theb parts that at us,. so that we don't have these kind of weird failures. The answer is a lot of them really boiled down to, don...