  Recognizing the existence of SPX may not incur the cost of additional experiences, but it does involve the introduction of additional experiential relationships. It is now being supposed that D and E are connected by the relationship of diachronic co-consciousness, whereas previously it was previously held that only C-D and E-F were so related. But on the assumption that D and E constitute a directly experienced succession, D evidently is diachronically co-conscious with E.