is#mathematical_symbolic_structure
  exclusion:  symbolic_structure_not_fully_mathematically_defined
  supertype:  symbolic_structure
  subtype:  mathematical_KM_structure
     subtype:  FCA_structure
        subtype:  FCA_formal_context
           subtype:  FCA_simple_formal_context
           subtype:  FCA_many_valued_context
              subtype:  FCA_incomplete_context
        subtype:  FCA_formal_concept
        subtype:  FCA_graph
           subtype:  FCA_concept_graph
              subtype:  FCA_existential_concept_graph
              subtype:  FCA_concept_graph_with_negation
                 subtype:  FCA_semiconcept_graph
                    subtype:  FCA_semiconcept_graph_with_variables
                 subtype:  FCA_protoconcept_graph
                 subtype:  FCA_concept_graph_with_cuts
           subtype:  FCA_relation_graph
        subtype:  FCA_ontology

1 statement is about a direct instance of mathematical_symbolic_structure: graph7_on_article

6 statements are about indirect instances of mathematical_symbolic_structure: graph27_on_article, graph29_on_article, graph30_on_article, graph3_on_PhD_thesis, graph32_on_article, graph33_on_article
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