The San He Combination (三合) is based on the concept that three distinct Earthly Branches generate the element of their combination. This interaction is observed in the Earthly Branches that represent the Growth (长生), Prosperous (帝旺), and Grave (墓) stages in the 12 Lifecycle Phases, which mirror the “Growth,” “Cardinals,” and “Storages” categories. There are four possible San He combinations: Wood, Fire, Metal, and Water. Each combination plays a significant role in understanding the elemental balance and interactions within Chinese metaphysics.