The four directional words "East", "West", "South" and "North" in Mulan Ci are all empty meanings, which are used to render the atmosphere and express "many places". It's not really four places to buy.
Arranging the characters according to the directions of east, west, north and south, in addition to being neat, harmonious and beautiful, can also well render Mulan's nervous and orderly purchase of war horses and riding equipment before going out to war, which fully shows Mulan's initiative and determination to join the army as a father.