In numerology, there are five combinations of heavenly stems and six combinations of earthly branches. The five combinations of Tiangan are: Ding Renhe, Jia Heji, Yi Geng He, Bing Xin He and Wu Gui He. Harmony needs to meet conditions to succeed, otherwise it can only be discussed from the perspective of mutual respect.
The five elements are divided into yin and yang.
Specifically: Jiamu, Ethyl Wood, Propofol, Ding Huo, Bentonite, Jitu, heptene, Cynanchum atratum, Non-water and Cinnamomum cassia, in which methyl propyl heptene is positive and ethyl butyl cetyl is negative.
In China's calendar, A, B, C, D, E, Ji, G, Xin, Ren and Gui are called "Ten Heavenly Stems", while Zi, Ugly, Yin, Mao, Chen, Si, Wu, Wei, Shen, You, Xu and Hai are called "Twelve Earthly Branches". The two cooperate with each other in a fixed order, forming the discipline of cadres and branches. In Ci Yuan, it is said that "dead branches" are meaningful to trees.
The above content reference: Baidu Encyclopedia-Tiangan