List Enumeration Types

select * where { 
{ 
  graph ?g {
    ?s rdfs:subClassOf <http://schema.org/Enumeration> .
  } 
}
Union
{ 
  graph ?g{
    ?s rdfs:subClassOf ?s2.
    ?s2 rdfs:subClassOf <http://schema.org/Enumeration> .
  }
}
Union
{ 
  graph ?g{
    ?s rdfs:subClassOf ?s3.
    ?s3 rdfs:subClassOf ?s2.
    ?s2 rdfs:subClassOf <http://schema.org/Enumeration> .
  }
}

}