 Three, three, three, I say, three term contingency, antecedent, behavior, consequence, right? So an antecedent and a behavior and a consequence is the three term contingency, if you'd like to define it further and be more specific, it is a discriminative stimulus, also known as an SD, it is a response, also known as an R, also known as a behavior, right? And then there is some sort of consequence over here, which is a reinforcer, a punisher, extinction, which would be nothing, right? So anyway, the point is three terms, it's a contingency, which is that if, then statement, that rule that we've talked about previously, the point being that that three term contingency explains a whole bunch of behavior, but just so you know, just so the experts out there that know everything there is to know about three term contingencies and behavior also know that I do know there are things that are four term and possibly five term contingencies. There can even be contingencies of contingencies, which we call meta contingencies, which gets really fun. Thank you, Sigrid. Anyway, that's all there is to it, three term contingency helps explain behavior. Think of it as antecedent behavior, consequence, goodbye.