There's lots in oo libraries to do the same things cause they've each specialized in something which a new archadamic has just written a paper on. So i thought maybe we could sort of talk through a little bit what is the problem. And then maybe, really first quick quickly introduce what this this area is,. Then we can then talk about the problem, the example problem out there in sem of the libraries and techniques there. Sure. The chap to hicour you're looking at right there, at you say, isa, is about a a mathematical idea, anot of a concept called a mark of change. S is this probability model that you loosely gulle that