 reversal designs. ABABA, ABABA, ABABA, ABABA, CBABA, CBABA, ABABA, CBABA, CBABA, CBABA, CBABA, CBABA, CBABA, CBABA, CBABA, CBABA, CBABA, CBABA, CBABA, CBABA, CBABA, CBABA, CBABA, CBABA, CBABA, CBABA, CBABA. Thank you Ron and Nancy Martella for clarifying that you can do a lot of different types of reversal designs. And for those of you who don't know the Martella, you go look up their damn research right now because it's cool. It is. It really is. Anyway, they're just that awesome. Anyway, so reversal design is an experimental technique where you put something in place, a condition in place, or start with a baseline. And then you put some sort of intervention phase in place. And then you remove that intervention phase and go back to baseline. Then you put it back in place. That's an ABAB design. So the idea is you're trying to establish this sort of on-off effect on behavior. It's a light switch. So we want the behavior to go on and off and on and off or up and down and up and down, whatever it is. When or at the moment that we switch conditions or almost at the moment, there's always some changes or there's always some transition periods. So reversal or withdrawal designs. So again, thank you, Ron and Nancy, for clarifying that they're not, they're not completely interchangeable terms, but they're often talked about that way. So wow, the camera's shaking. Haven't seen the camera shaking a long time. So that's creeping me out. It must be in a reversal design. See ya, bye.