What does the combination of yin and yang mean in fortune telling?

The combination of Yin and Yang is a concept in China's classical philosophy, which has been applied in many surgical systems. In the most commonly used five-element fortune-telling system, each branch has its own branches, such as the combination of Jia Mu and her own soil, purple water and ugly soil, etc., commonly known as heavenly stems and earthly branches Liuhe, and these combined branches can be transformed into other five elements under certain conditions, such as the combination of C fire and Jin Xin to become water. Similarly, hydrogen and oxygen can combine to form water under certain conditions.