Problem Set: Edi Note Mathematics I + A Keirinkan Price: ¥840 Includes answer key. The previous owner's name was written on it, but has been erased with correction tape. There is no other writing, and the product is in good condition. It has been stored in a dark place at home. Please refrain from purchasing if you are sensitive to used items due to home storage. Will be shipped with measures to prevent bending and water damage. Instant purchase is OK.