This video, https://www.youtube.com/watch?v=S0kHvrgZBzM&list=PL9DZ7V4iicn_KDgZRKo7vZFjn7_jm7HB7&index=3, can also be seen at https://www.youtube.com/playlist?list=PL9DZ7V4iicn_KDgZRKo7vZFjn7_jm7HB7.