assertion  retraction  graph  subject          predicate        object           datatype  annotation
1          0           graph  obo:CHEBI_26217  rdfs:subClassOf  obo:CHEBI_33296  _IRI      
1          0           graph  obo:CHEBI_35479  rdfs:subClassOf  obo:CHEBI_33296  _IRI      
1          0           graph  obo:CHEBI_26712  rdfs:subClassOf  obo:CHEBI_33296  _IRI