the taste is equal to the creation of one it is doing and it is changing with the standard of hossein madaghi. it is said that there are educational books in the world where the same textbook has been taught for years and is still successful. i can't talk about the derivative proof book. we published nearly a thousand titles in this year 992. some of us are related to technical and professional fields. basically, the content in these fields changes very quickly. the primary and secondary level of the common knowledge lands in our book is 5 years we consider 10 years as normal , even the books in other countries have different revisions, of course, revisions are not yearly, i said, or 5 years or 6 years, and if it is taken into account, what does it mean to say that updating and currency of the book is an essential part of the process. yes, yes, there is a disturbance that we want to convert to islam every year . please show that there is definitely not enough and detailed planning in the process of preparing and editing the book. for example, tomorrow, saturday, after one one year or two year