This video, https://www.youtube.com/watch?v=At0hdtyL7Qk&list=PLtOAQGZiCXiHNUsc3dMsB9eRJ-uxq8Y30&index=25, can also be seen at https://www.youtube.com/playlist?list=PLtOAQGZiCXiHNUsc3dMsB9eRJ-uxq8Y30.