This video, https://www.youtube.com/watch?v=az-5JtYMQCE&t=0s&index=2&list=PLSjtLzqIlLSUggNdLpPWNUj7vX4XGhBrB, can also be seen at https://www.youtube.com/playlist?list=PLSjtLzqIlLSUggNdLpPWNUj7vX4XGhBrB.