DUO 3.0 This is a listing for the book (textbook) only. CD is not included. Please be aware. I was motivated to study, but I just left it on my desk and hardly opened the pages. While drinking coffee, I was lured by the catchphrase, "With this, so much!" As technology rapidly advances, it’s tough to keep pace with it. I repeated this over 1000 times. I memorized this phrase, but I didn't delve into the content. Therefore, the outer cover is slightly dirty. However, there are no writings or stains on the inner pages. For me, keeping up with this content was "very difficult." #book #Duo3