 contingency. See the consequence of Brad saying consequence was me saying contingency, which was a contingency. Never mind, we'll come back to that. You're gonna have to watch a lot of videos to figure out why that didn't make sense, but kind of did on the edge. Anyway, so the point being that contingency is the word, it is a rule. It is a rule about a dependent or temporal relation between the environment and operant behavior or other behavior and behavior or anything in behavior, operant behavior and controlling variables and the point is something happens that prompts behavior to happen. That is the type of contingency, right? So then reinforcement, you add all that stuff in there, blah, blah, blah, blah, blah, blah. We have three term contingencies. You got four term contingencies. You got five term contingencies, but the easy way to think of it is it is a rule about the relation between some variable, some controlling variable, whatever, and operant behavior.