Please read the self-introduction. No price negotiations. This is a problem set and answer sheets. Please access the answers via the included barcode reader. Approximately 50 copies of the answer sheets (B5 size) will be included as a bonus. Please consider this a bonus as it's difficult to check which year and date's sheets are remaining due to the large quantity. Delivery will be via Nekopos or Yu-packet, with simple packaging. There are probably no writings, but I apologize if I missed any. This is a used book, so no claims and no returns are accepted. I have a cat, so there may be some overlooked cat hair. Please refrain from purchasing if you have a cat allergy.