The text has writing on the problem numbers. The cover and back cover show signs of use. The name was written, so it has been erased with correction tape. ★This text only contains the answers to the check questions, but I will include the text answers distributed in class! However, there are some missing parts, so please check the images. The practice answers are largely missing, but the practice problems are similar problems that are not covered in class, so there should be no problem. Please understand that the loose-leaf paper has holes and is folded. I also have other reference books for sale, so bulk purchases are welcome. Feel free to comment. I have a lot of Teiryo-kai problem sets and printouts. Negotiations for price reduction will be possible after a while. Please purchase only if you understand that this is a used item and has been stored by an amateur. Black spots are visible in the product images, but they are not on the product itself; they are due to a malfunction of my camera. Please read the profile before purchasing.