 That is true. Sometimes you do have to take your best guess. I mean, that is part of auto repair today. It's come down to that. And it's not for lack of trying. It's not for lack of ability. It's not for lack of equipment. It's because of what we're working on, that we've got to get as close as we can to a solution and then go, okay, it's this or it's that. This is more likely.