・The cover is dirty and the pages are bent. ・I've erased most of the writing inside, so there shouldn't be any problems when solving the problems. (There is some writing in the answers.) Please feel free to ask if you have any questions. - Title: Chemistry Important Problem Collection 2025 - Author: Sūken Shuppan Editorial Department - Category: Chemistry Fundamentals & Chemistry - Pages: Detailed problems and explanations - Type: Problem collection & Answer key - Price: 850 yen Thank you for looking.