Zi Collection, Page Position: Upper. Radical: Mouth (kǒu). Page 185, Entry 02. Guangyun (Broad Rhymes) says: Pronounced xu; Jiyun (Collected Rhymes) says: Pronounced hu. The sound is read as xue. The commentary on the Daoist Canon (Daojing Shu) in Guangyun (Broad Rhymes) says: This is the sound of exhaling. In Jiyun (Collected Rhymes), it is sometimes also written in a variant form (huo).