Form, cause, becoming, space, time: these are the topics to be considered by metaphysics.   There is good reason to offer a structure that has four levels, just as is found in neoplatonism and in kabbalah, but every thing depends on what these four levels are and do, and what their relation to one another is.  But the first task is simply to name them:  there are four Alimonies, and their names are 01010n, ANANON, YLYLCYN and S/HE/IM