Ba Zi/Hidden Stems

Hidden Stems in Earthly Branches
Each Earthly Branch in the four Pillars will have one or more Hidden Heavenly Stems.

For example, if the Earthly Branch of the Month Pillar is E11, then the Hidden Heavenly Stems are H4, H5 and H8 for the Month Pillar. If the Earthly Branch of the Day Pillar is E10, then the Hidden Heavenly Stem is H8 for the Day Pillar.