This mutual supervision of the situation to avoid the excessive centralization of the qin dynasty, but this is not full retreat, are interested in a long-term within a period of the warring states dark ghd period between again of conflict situation. This arrangement is a pure expediency, never expected to keep for a long time. Even in liu bang poineering person before his death, there have been many HouGuo, for intentional and a careless mistake, be cut away.