 So, that's a huge number of fun concepts we're going through. I will not repeat all of them, but these are the conceptual things that I told you we're going through. I think I covered all of them. To take you through that, think about the concepts we've covered here, and then I have a number of study questions for you. Try to answer these for yourselves. If there's something you hesitate about, go back to the corresponding concept or made me or write a question in Athena and we will handle it from there. But hopefully, they should aid in your studies. It was great seeing you.