assertion  retraction  graph  subject          predicate        object           datatype  annotation
1          0           graph  obo:CHEBI_83403  rdfs:subClassOf  obo:CHEBI_23132  _IRI      
1          0           graph  obo:CHEBI_26888  rdfs:subClassOf  obo:CHEBI_23132  _IRI      
1          0           graph  obo:CHEBI_23697  rdfs:subClassOf  obo:CHEBI_23132  _IRI