Chou Collection, Lower Volume Radical: Woman (nǚ) Entry: Yi Kangxi strokes: 15 Page 270, Entry 39 Shuowen Jiezi (Explanation of Simple and Compound Characters) states this is the original form of the character duo. Additionally, a lack of solemnity and discipline is referred to as yan yi. Book of Han (Hanshu), Biography of Zhang Chang, Eulogy: However, he suffered a reputation for being flippant and negligent. Notes: The character yi is identical in meaning to the character duo.