Finally, I took the course from beginning to end. Thank you for making it a course that I really wanted to take. If I had studied alone while reading the book, it would have been difficult. But watching the course helped me a lot. It was helpful to understand the course because it provided more examples than the ones in the book. Since it is not an easy course, I think I will have to study this course over and over again. I am looking forward to the next course!! Thank you.