In the "Yùpiān" (Jade Lexicon) and "Piānhǎi" (Ocean of Leaves), it is the same as the character "píng." Additionally, the "Book of Jin, Biography of Shi Chong" (Jinshu, Shichong Zhuan) records that "jiǔ qīng jī" is made by pounding leek roots and mixing them with wheat sprouts. Furthermore, the old city of "Qīngshā Wáng" (Green Sand King) is found in the records of the "Commentary on the Water Classic" (Shuǐjīng Zhù).