Before finishing this section, it must be commented that our observation of three (two) stages in group-15 elements, which is characterized by the progressive equalization of primary and secondary bonds at HP and includes the anomalous increase of bond distances of covalent is consistent with the experimental observation of bond equalization and anomalous elongation of short covalent bonds in trimers during the process of ERMB formation. These features were observed in molecules forming trimers of Sb and Te with halogen atoms by Hoffmann and coworkers, and later reploted by Lubchenko and coworkers . They attributed the anomalous increase of the short covalent bond to trans influence corresponding to stage 2, despite that no critical bond distance was noted by those authors. Support for the existence of the proposed stages has been recently provided by the existence of critical points marking regions separating the continuum between supramolecular bondings and covalent bonds .