In addition, some documents were never disposed of and survived accidentally in other forms: by being copied down in manuscripts or when the reverse sides of documents which had already been fulfilled were reused to draft new ones.
また偶然、機能を終えた文書の裏面を利用して写本を行ったり、裏面に草案をしたためたりして廃棄されずに、別な形で伝世する場合がある。