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…There are remains of scattered messages written in kana from the mid-Heian period. The lines were already irregular, and the "kaeshigaki" (follow-up writing) was written in the margin at the beginning of the sentence, even between the lines. This was later formalized and became the style of Nyobohosho (messages sent to women). In the early modern period, the standard styles of scattered messages included Kosujisho (small lines), Fujihana-style (fujibana style), Tateishi-style (tateishi style), and Ganko-style (ganko style). …

*Some of the terminology explanations that refer to "return writing" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…仮名消息の散らし書きは平安中期ころの遺品がある。それは各行を不そろいにしたり，文首の余白に返って追而書（おつてがき）をする〈返し書き〉がすでに行われ，それが行間にまで及んでいるが，後にこれが形式化して女房奉書の型となった。近世に消息の散らし書きの定型として，小筋書，藤花様，立石様，雁行様などがある。…

※「返し書き」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報