The eight-character Japanese branch has roots, which means that the eight-character heavenly stem and the eight-character Japanese branch Tibetan stem have the same five elements.
For example:
Born in Xin Youri, Xin is five elements of gold, and you is five elements of Xin.
Born in Xu Bingri, Xu Bing is the fire of five elements, and it also hides five lands, Xinjin and Ding Huo, so the Japanese branch has the root of fire.
If you were born on your third birthday, your son is a Japanese branch, and your son will hide cinnamon water. There is no fire of life, this is Ding Huo's five elements. Therefore, the Japanese branch has no roots of C fire.
In metaphor,
Sun branches have roots, just like trees. They have roots and can absorb nutrients and water by roots. If a tree has no roots, no matter how you water it, it can't be absorbed.