1) Force combination. The X:R Columb attraction and the X:⇔:Y repulsion pair up the Z-X and R-Y dipoles. The X:⇔:Y repulsion not only equilibrates the inter-dipolar X:R attraction but also correlates the inter-dipolar X:R nonbond and the intra-dipolar R-Y polar-covalent bond, which dictates the performance and functionality of the X:R-Y bonding system when responding to a perturbation. The R-Y can be covalently bonded such as H2 that turns to be an instantaneous H δ + -H δdipole under the force of London dispersion. The X:R-Y follows the HBCP regulation, provided that the X:⇔:Y repulsion is sufficiently strong. Therefore, any three-body interaction meets this criterion can be categorized into the extended hydrogen bond, without needing electronegativity discrimination.