"Guangyun" uses the characters "ren" and "zhu" for fanqie pronunciation, and "Jiyun" uses "ru" and "zhu" for fanqie pronunciation, with the same pronunciation as "ru". "Shuowen Jiezi" explains it as the sound of ghosts crying "nán nán" incessantly. Also, "Guangyun" uses the characters "nu" and "gou" for fanqie pronunciation, and "Jiyun" uses "nu" and "hou" for fanqie pronunciation, with the same pronunciation as "nu". Furthermore, "Jiyun" uses the characters "nai" and "dou" for fanqie pronunciation, with the same pronunciation as "nou". The meaning is the same.