The second and seventh floors belong to the south and belong to the fire. Therefore, the second and seventh floors of a building belong to fire, and the mantissa is at the level of two or seven, which also belongs to fire, such as the twelfth, twenty-second and thirty-second floors.
The third and eighth floors belong to the east and wood. Therefore, the third and eighth floors of a building belong to wood, and the mantissa is at the level of three or eight, which also belongs to wood, such as the thirteenth, twenty-third and thirty-third floors.
The fourth and ninth floors belong to the west and to gold. Therefore, the fourth and ninth floors of a building are gold, and the mantissa is four or nine, such as the fourteenth, twenty-fourth and thirty-fourth floors.
The fifth and tenth floors belong to the center and the earth. Therefore, the fifth and tenth floors of buildings belong to soil, and the mantissa of five or ten is also soil, such as the fifteenth, twenty-fifth and thirty-fifth floors.