For example, among the Heavenly Stems chia & i belong to wood, and ping & ting to fire; among the Earthly Branches, ying, mao & ch'en belong to wood, and ssu, wu & wei to fire.
例如，就天干來說，甲乙屬木、丙丁屬火；在地支中，則是寅卯辰屬木，巳午未屬火。