It makes no difference. There is no difference between the R version and the pep version in Canon, but the name is different. R edition and PEP edition are PEP editions, which correspond to the textbooks published by People's Education Publishing House. As for why the names are different, it is a matter of the times. With the development of the times, names are also advancing with the times. Diandian is a famous supplementary teaching material edited by Rong and has become one of the favorite teaching materials for teachers, parents and students. Annual sales hit a record high.