Is There a Difference Between Contingency and Necessity?

I think that contingency and necessity are valid distinctions that we our modal distinctions refer to truths in the world. So if I say that you know How makes some claim that it could have been the case that x y and z happened I think it's true that it could has been the case. And so um I want to in traditional philosophy fashion Um Say I don't know that I haven't thought about that question enough But if the tips are down If I'm making arguments and I'm thinking about it. They're at least useful in that sense Okay, um za can I give me like one second. Why is it that you part ways with someone like William lien kreg or