This is a "Comprehensive Problem Book for High School Information I." There is some writing in it, which I have erased, but there may be traces or areas I missed. Notes: * I have a cat (I will try my best to prevent cat hair from getting in). * I will reply within 24 hours whenever possible. * I will ship within a week unless there are circumstances (I will write about any circumstances in my profile). There may be some bending or folding, and it has been stored at home, so please purchase only if you understand this!