2. Human voice is one of the main branches, ranking 39. The former is bitter and ugly, while the latter is bitter and ugly. On the five elements of Yin and Yang, the heavenly stems belong to the water of Yang, and the earthly branches belong to the wood of Yang, which is called aquatic wood.
3. Wuyin is one of the main branches, and the sequence is 15. The former is Ding Chou and the latter is Ji Mao. On the five elements of yin and yang, the martial arts of heavenly dryness belong to yang soil, and the yin of earthly branches belongs to yang wood.
4. Ding Si is one of the main branches with a rank of 54. The former is Chen Bing and the latter is Wu Wu. On the theory of yin and yang and five elements, the heavenly stems belong to yin fire and the earthly branches belong to yin fire, which is a good ratio.