 A further problem that applies to both Langton and Lewis’s account and Weatherson’s account is that they are incompatible with certain metaphysical views that posit necessary connections between wholly distinct entities. On a popular view of sets, for example, each thing \(x\) is wholly distinct from its singleton set \(\{x\}\), and is such that, necessarily, it exists iff its singleton \(\{x\}\) exists. Given this view, however, no contingently existing things can be lonely, and hence no intrinsic property that can only be had by contingently existing things can be independent of accompaniment. Given being made of tin is such a property, it follows that each of the above combinatorial accounts falsely classifies being made of tin as extrinsic, given the above view of sets. (See Cameron 2008, 2009 for more discussion.)