What do the fire, water and soil in Jin Mu represent in the Eight Diagrams?

Two instruments: heaven and earth or yin and yang;

Three talents: heaven, earth and people;

Four elephants: Qinglong, Baihu, Suzaku and Xuanwu;

Five elements: wood, fire, water and earth;

Liuhe: hand, eye, body, essence, qi and spirit;

Seven stars: Shu Tian, Tianwangxuan, Tianji, Tianquan, Yuheng, Kaiyang and Yaoguang;

Eight diagrams: dry, Kun, true, Xun, Kan, reason, root, right;

Jiugong: Jiugong people, that is, two or four are shoulders, six or eight are feet, three are left and seven are right, nine are worn, and five are middle schools.