What is "Gong Cao"

In the Eastern Han Dynasty, ministers were divided into six Cao Cao. According to History of Baiguan III, there are three Cao Guan, three Cao Guan, three Cao Ren, two North and South Cao Ke, and two thousand Cao Shi. However, the Official History of the Book of Jin records that three Cao, official Cao, civilian Cao, guest Cao, two thousand stone Cao and all official Cao are six Cao. After Wei and Jin Dynasties, it changed many times, and it was not until Sui and Tang Dynasties that it was designated as six departments: official, household, ritual, soldier, criminal and industrial. During the Tang Dynasty, Georgian officials were divided into six Cao Cao, namely, Gong Cao, Cang Cao, Hu Cao, Bing Cao, Fa Cao and Cao Shi, also known as the Six Departments.