Yi and Geng combine and turn into gold. When the wood of Yi is rootless, lifeless and helpless in the fate, and metal is strong and strong, Yi will follow Geng and turn into gold. This is called The wife transforms from her husband, but when the wood is prosperous and powerful and Geng has no roots and is helpless, Geng will follow Yi and transform into wood. This is the husband transforming from his wife. When both have roots or are primordial or helpful, they are united and not transformed, and they are stuck, so they talk about priming and overcoming, which is Geng metal overcoming Yi wood.