Here is the priority list for formation (frame), combination, penalty and clashes (chong). Please save the list for your future reference:

1. 4-clashes, as in zi-wu-mao-you (“chong“)
2. 3-meeting formation (“hui”, frame, like yin-mao-chen wood meeting)
3. 3-unity combinations (“he”, e.g. shen-zi-chen water combination)
4. 3-penalty (“xing“)
5. 6-mutual clash, e.g. wei vs. chou (chong)
6. semi- 3-unity combination, like zi-chen semi water combination (“he“)
7. mutual penalty (“xing“)
8. 6-combinations (“he“)
9. 6-harm (“hai“)

10. break (“po“)

Ken Lai