Thank you for your honest review. When I filmed everything from beginning to end, it took about 2 hours, so I intentionally stopped and re-filmed it in the middle. However, since you said it was inconvenient, which was different from my intention, I will consider it when filming future lectures. I will organize the lecture materials next week and upload them all at once. Since the lecture video is already a year old, if you continue to have version problems, please contact me and I will re-film it as soon as possible. I hope you have a happy holiday.