Next question comes from Thomas, and his question has to do with mistakes. Basically, you never seem to make any–at least in the videos. Maybe you can talk a little bit about your design process in coming up with these lectures and how mistakes figure in there. There is always a trade off of how many mistakes we want to leave in, and believe me, I make lots of them. And I make them at various points in time. So as I’m first thinking up the questions we’re going to do, I’m coding up answers. And I make mistakes there in a couple of ways. One is, I just make errors. I write something. It computes the wrong answer. It generates an error. I swapped the order of two arguments, or I pass the wrong thing in. I’m making those mistakes all the time. Those aren’t very interesting ones, so I don’t show them. And then, when I’m recording the videos, I make mistakes there too. And, sometimes errors have crept into the program that I didn’t notice when I was developing them. I didn’t write enough test cases, and then I have to decide what to do. And mostly, those have ended up on the cutting room floor. So, just as when you watch a movie or a TV show, you don’t see most of the outtakes. Sometimes after the credits, they roll a few of the outtakes So believe me the errors are there, we’re not just showing most of them.