Impact! Thank you. I think that instructors are motivated to continue creating the next lecture by the encouragement of their students. I think you left a review for my previous lecture as well. Thank you so much. Since you were able to follow along without difficulty, I think you are already skilled. When preparing a lecture, I often find a dilemma where the difficulty level increases when I try to make it as realistic as possible. However, I think that people like Impact need a lecture with a level of difficulty. I admit that the lecture is difficult, but I put a lot of effort into making it, so please ask questions at any time during the lecture if you have any difficulties. Fighting! Daniel Dream