This video, https://www.youtube.com/watch?v=5i1xsX28xNM&index=7&list=PL-aPY9kwDtN0WNrDKfwGlHPCrMFEtsdwJ, can also be seen at https://www.youtube.com/playlist?list=PL-aPY9kwDtN0WNrDKfwGlHPCrMFEtsdwJ.