"That is to say, with the ancestors of the same book or another book to read, if there are any differences, just beside it. Liu told Bielu that "one person holds a book, one person studies, and if he complains about his family", that is, this method is also true. This method is the simplest and most stable, and it is purely mechanical. Its main purpose is to check similarities and differences, not right and wrong, so its disadvantage is irresponsibility. Although there are mistakes made by one's ancestors or others, they are recorded according to the style; And its strength lies in not participating in its own opinions, getting this school-based and knowing the true colors of its ancestors or others. Therefore, every school must first use proofreading methods, and then use other proofreading methods. "
That is, proofreading with the ancestors of the same book or other books, proofreading the similarities and differences of each book, without examining right and wrong. On the basis of extensive collection of different versions of the same book, a rare book is selected as the base copy, and then it is collated with other versions. However, if there are many versions and the pedigree is unclear, it may increase the error.