Thank you for viewing! [Product Information] First edition in 2022, published in 2024, purchased in March 2025. I wrote directly in the problem set with a mechanical pencil. I erased it with an eraser, but the pressure of the writing remains slightly. (I have uploaded images) I think it's to the extent that you won't notice unless you look closely, but please understand. There are scratches on the corners. [Other] ・Instant purchase without comment is welcome (*^^*) ・This item is stored at home. There may be oversights, but please forgive me. ・No smokers, no pets.