Explanatory Relevance Criteria

I like the way I set things up is like this, you're trying to capture something about the story. Not everyone would agree with that but I think I can make allowances for people who are a little bit more suspicious about causality always being at the center of it. And sometimes as I say it's going to be so little of the story that you won't really have much of an idea of how the story unfolded except that it had to end in this particular way. The fittest variant taking over the population, one way or another, and so on.