 Here, D = the divine nature of the Son, N = the human nature of the Son, and B = the body of the Son. As before, the lines with arrows on each end represent the symmetrical improper parthood relation. In this illustration the one-arrow lines represent the asymmetrical proper parthood relation. Thus, the divine nature of the Son and the human nature of the Son are proper parts of the composite Son, and the human body is a proper part of the human nature (and thus, also of the composite Son).