As this was used by a family member, it is difficult to confirm all markings and writing. However, after a quick flip-through, I did not find any. I apologize if I missed anything. I am unsure if the answer key is a separate booklet, but this is only the main textbook. ーーーーーーーーーーーーーーーーーーーーーーー While I have checked the item, there is a possibility of oversights. Please purchase with the understanding that this item has been previously owned. ● Even during discussions, the first person to purchase will be prioritized. ● Depending on the package size, I may change between YuYu Mercari and RakuRaku Mercari at my discretion. ● I may reuse packing materials or compress items for packing. ーーーーーーーーーーーーーーーーーーーーーーー