lksj112, thank you for leaving another precious course review. I'm especially grateful that you initially had some disappointments, but through review, you came to understand and changed your evaluation positively. When rushing through, there are parts that get stuck, but I'm impressed by how you calmly repeated and understood through multiple attempts. I'm even more grateful that you didn't give up on the course. I won't say my lecture is a perfect lecture. If you complete it to the end and gain something from it, that would be a great reward for me. I'll continue to support you in completing it to the end. Thank you.