Revised edition. Available for immediate purchase. No price reduction. No individual sales. I am selling this because I bought it as specified by the school, but I don't think I will use it in the future. There are no writings, and it is in very good condition, but please understand that it has been in someone else's hands once. After taking thorough waterproof measures, I will ship it. For all products, we will offer a slight discount when sold as a set with other products. If you have any questions, please feel free to ask.