assertion  retraction  graph  subject          predicate        object           datatype  annotation
1          0           graph  obo:CHEBI_83820  rdfs:subClassOf  obo:CHEBI_33709  _IRI      
1          0           graph  obo:CHEBI_33704  rdfs:subClassOf  obo:CHEBI_33709  _IRI      
1          0           graph  obo:CHEBI_47381  rdfs:subClassOf  obo:CHEBI_33709  _IRI