Rikei Suugaku Nyushi no Kakushin: Hyojun Hen Revised Edition Z-Kai Price: 1100 yen The problem sets are separate and detachable, and have been removed. (See photo 3) There were a few instances of check marks and crosses written in pencil on the problems, which have been erased. I didn't find any other writing, but there may be some oversight, so please understand. The condition is very clean. Thank you very much!