1. A and B: belong to wood, and the color is green;
2. C and D: belong to fire, and the color is red, purple, orange, and pink;
3. Wu and Ji: belong to earth, and the color is yellow and brown;
4. Geng and Xin: belong to gold, and the color is white and silver;
5. Ren , Gui: belongs to water, color is black, blue.