After parsing and importing, then you're into the how are they different behaviorally? Yeah. This is it's just sort of like, I alluded to this earlier, but basically the idea of you run all of your tests. And luckily, we had already built up a lot of infrastructure that was really useful to us. So that was about a year of basically going through all of those test failures and figure out, okay, why do they file fail under Python three?"