 So much for the two main options, corresponding to atomicity and atomlessness. What about theories that lie somewhere between these two extremes? Surely it may be held that there are atoms, though not everything need be made up of atoms; or it may be held that there is atomless gunk, though not everything need be gunky. (The latter position is defended e.g. by Zimmerman 1996.) Formally, these possibilities can be put again in terms of suitable restrictions on (P.7) and (P.8), by requiring that the relevant conditions hold exclusively of certain entities: 