 This is a mathematical snack from the Association of Teachers of Mathematics. This is a game for two players called sprouts. Start with any three marks on a piece of paper. We call these nodes. In your turn, draw a line between any two nodes. We call this an arc, or an arc can join a node to itself. When you've drawn the arc, put a node on it. Once a node has three sprouts or arcs, it becomes out of bounds and I'll mark it in red. An arc must not cross another arc. We're going to keep playing until one of us can't go. Christine, you start. I'm going to draw a line, an arc between these two nodes. And you put your node on it. I'm going to join those two and I'm putting a new node on it. So because this has now got three arcs, this can't be used a lot. I'm going to draw an arc between these two nodes. There's my middle node. And we'll put this one out of bounds. I'm going to draw an arc from there to there, and I'm going to put a new node on it. My arc is going to go from this node to there. There's my middle node. Also, this one can't be used anymore, and this one can't be used anymore. That's true. I'm going from here to here and I'll put a new node on there. And we've knocked out that one and that one. I'm going to put mine all the way around to there. There's my new node. This one now can't be used. Nor can that one actually. No, that one can't. I'm going to join that one to that one. Oh, and I've got to put a new node on it, of course. And I'm marking that one as out of bounds and that one as out of bounds. Over to you. I can't now go. You certainly can't. Because I could have done an arc all the way together, but then it would be four. Absolutely right. So you win. Thank you. And that's how you play the game.