Union subset of Class

Ontology(<http://www.semanticweb.org/wmilnor/ontologies/2018/3/ClassNotationAnalysisRow147>
Import(<http://nomagic.com/ConceptModeler/ConceptModelingSupportLibrary/>)

Declaration(Class(:A))
Declaration(Class(:B))
Declaration(Class(:C))

SubClassOf(ObjectUnionOf(:A :B) :C)
)