So like always, pause the video and see if you can make sense of this. All right, I'm assuming you've had a go at it. So one way to think about it is, okay, if you say there's a handshake, well, a handshake has two people are party to a handshake. We're not talking about some new three-person handshake or four-person handshake. We're just talking about the traditional two people shake their right hands. And so there's one person, and there's another person that's party to it. And so you say, okay, there's four possibilities of one party.