YINYANG - These are not the opposites, contradicting Dao, but the 2 slices of the same essence of existence. For every Yin there is Yang and every Yang there is Yin
5 ELEMENTS - These are not elemental matter liked rock or water but processes or transformation of Qi from one phase to another.
YinYang is the Body, 5 elements are the Applications.
These applications are further mapped out in the sequence of Heaven, Man and Earth, trinity.