 Bolzano believes that the subject-predicate form can accommodate relational claims, interpreting them as statements about collections. For instance, a claim that items \(A, B, C, \ldots\) are equal in the sense of all having attributes \(b, b', b'', \ldots\) could be interpreted as a claim about a collection containing two unordered sub-collections (Mengen), i.e., \(\langle (A, B, C, \ldots), (b, b', b'', \ldots)\rangle\), stating that the collection has the attribute that every item in the first sub-collection has each of the attributes in the second sub-collection (cf. §135, no.15).