This video, https://www.youtube.com/watch?v=qiwGuLpepqc&list=PLyMf_3FFEgiTKJOSrd8p0pRgPBkeopvFq&index=6, can also be seen at https://www.youtube.com/playlist?list=PLyMf_3FFEgiTKJOSrd8p0pRgPBkeopvFq.