 Well, let's see. David Hume, Dennis Diderot, George Berkeley, and Frederick Nietzsche are all dead. That's true. So is Mary Wollstonecraft and Philippa Foote. Philippa Foote was a colleague of mine at UCLA. I was a colleague of mine at UCLA. I can't find two more, though. So you want a category that fits only four of these people. So, for example, do you have anything in common with Hume? Whom?