This video, https://www.youtube.com/watch?v=zvdXrpShgkc&index=6&list=PLSjtLzqIlLSU1auTzzyjerfjpFVFQfKc4, can also be seen at https://www.youtube.com/playlist?list=PLSjtLzqIlLSU1auTzzyjerfjpFVFQfKc7.