7-1
http://www.youtube.com/watch?v=KdV4eWmE5q4
7-2
http://www.youtube.com/watch?v=qxd4ojcPsLs
7-3
http://www.youtube.com/watch?v=q9PqgVXOMQg
7-4
http://www.youtube.com/watch?v=YRarlbwHNM4
7-5
http://www.youtube.com/watch?v=JEJuTcwnaOQ
7-6
http://www.youtube.com/watch?v=uyk9hbyEPmg&feature=related
7-7
http://www.youtube.com/watch?v=fVi6ZE5GRXE