This video, https://www.youtube.com/watch?v=P9lmheKDSQ0&list=PL6BsSDLnXCAOdKgdTcFmBY5z0B0O_qrXN&index=10, can also be seen at https://www.youtube.com/playlist?list=PL6BsSDLnXCAOdKgdTcFmBY5z0B0O_qrXN.