This video, https://www.youtube.com/watch?v=sgMACLrdduw&list=PLSjtLzqIlLSUqJCDU0280ZY9yZQJ1SV1M&index=2, can also be seen at https://www.youtube.com/playlist?list=PLSjtLzqIlLSUqJCDU0280ZY9yZQJ1SV1M.