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The "Huai" and "Jiang" refer to the Huai and Yangtze River regions, associated here with the directional colors Blue (East) and Red (South) according to the Five Elements theory.
In this context, "Earth" (Tu) refers to the central element in Chinese cosmology, often represented by the color yellow, signifying the Imperial center around which the regional forces are arrayed.
original: "Dianmu Guan." This official was responsible for the management of the court's horses, ensuring the mobility and prestige of the procession.
original: "Yuma erren." These specialized attendants were tasked with leading the Emperor's personal steeds.
The "Qi" and "He" (Yellow River) regions are associated with Black (North) and White (West), completing the protective compass surrounding the central stables.