Now, we're going to calculate a player two best response. So, we can say, okay. Well, if our strategy here is to play one-third, one-third, one-third, player two could exploit us by always choosing rock. Now, we add that best response to the set of strategies that player two can choose at the depth-limit. So, now, we're going to solve this depth-limited subgame again, and we're going to say, add this depth-limit, now player two can choose. They can either choose the Nash equilibrium strategy that we had before or they can