Mere Possibilities
The mere possibilities are the possibilities that are not also actual. It would seem that they have no being but some attempts to account for them effectively give being to them: to say that they are actual at some other world or that they reside within the causal powers of things. This seems to grant mere possibilities both non-being and being, against Parmenideanism. Instead, a fictionalist stance is advanced wherein mere possibilities are fictional recombinations of already existing elements. Such recombinations have no being themselves but they can still be grounded in what there is. The Parmenidean preference is for a grounding in nature rather than other possible worlds since our knowledge of other worlds is largely informed by our knowledge of this world.