 All right, you already have an S plus. So now we're going to give you the S minus, all right? So an S minus is just simply the things in a discrimination training that are not going to signal reinforcement. They can really be broken down into two categories, S deltas, so those are S minuses that will become S deltas. And then you can also have your S minuses become SD minuses, which we're gonna talk about in another video that you may have already seen, but it's really just a punisher, all right? So example in 30 seconds or less, my mother is an SD, sorry, my mother is an S minus. If I was in training, why would that be? Because if I talk about behavior analysis in the presence of my mother, she goes this, she doesn't give me any reinforcement at all. I'm only teasing my mom. She's wonderful and she would reinforce me. But in this example, she doesn't, so she's an S minus. And you go through training enough and she becomes an S delta, where I just don't receive reinforcement if I talk about that. My daughter on the other hand, could also be an S minus for talking about behavior analysis, but it might be a different one. She decides to throw shoes at me if I talk about behavior analysis. And subsequently, she will become an SD minus. So there you go, folks. S minuses become S deltas and SD minuses. And S pluses become SDs, but SDs are not S deltas because, not Greek.