assertion  retraction  graph  subject          predicate        object           datatype  annotation
1          0           graph  obo:CHEBI_47857  rdfs:subClassOf  obo:CHEBI_33256  _IRI      
1          0           graph  obo:CHEBI_35358  rdfs:subClassOf  obo:CHEBI_33256  _IRI      
1          0           graph  obo:CHEBI_37622  rdfs:subClassOf  obo:CHEBI_33256  _IRI      
1          0           graph  obo:CHEBI_17102  rdfs:subClassOf  obo:CHEBI_33256  _IRI