SAPIX Kokugo no Kaname (Essentials of Japanese) for 5th Graders - 4 Book Set * Knowledge * Reading Comprehension - Text Edition * Reading Comprehension - Problem Edition * Reading Comprehension - Answer & Explanation Edition There are no answers written in the Knowledge book, but there are check marks and dates written in it. (Photo 4) There are many lines written in the Text Edition. (Photo 5) There are writings only in the 17th session of the Problem Edition. I erased them, but the red pen marks remain. (Photo 6) There are no writings in the other sessions. For those who understand the above.