According to the Five Elements sequence of generation & domination, the central focus is "ego" (in other words the Heavenly Stem defining the day of birth, in the four columns which make up the a person's Eight Cyclical Characters). From this starting point a personal schema can be laid out; it's an extremely complex business, but a general summary is set out below.
再依五行的生克關聯，以「我」（指生辰八字中的日柱，特別是其中的天干）為中心點，定出一套規則，這套規則極其複雜，以下舉其犖犖大者：