I have a set of 12 textbooks and 12 CDs. Booklets 9, 10, and 11 are missing. - Set Contents: English Kings, all 12 volumes, and the Kids edition - Learning Method: Suitable for short study sessions at home - Volumes: Textbooks from volume 1 to volume 12 As the photos show, volumes 1-3 have signs of being opened, but volumes 4 and later appear to be unused. Volume 1 has marker marks on the section about how to use the textbook. Otherwise, there appears to be no writing. I will sell this to someone who understands that it has been stored for a long time.