Document(
    Prefix(ex <http://example.org/example#>) 
    Prefix(rdfs <http://www.w3.org/2000/01/rdf-schema#>) 
    Import(<http://www.w3.org/2005/rules/test/repository/tc/RDF_Combination_SubClass_4/RDF_Combination_SubClass_4-import001> <http://www.w3.org/ns/entailment/RDFS>)
    
    Group ( 
      ex:a ## ex:b
    )
 )