is#knowledge_based_document_search
  supertype:  is#knowledge_based_information_search  is#knowledge_based_document_indexation_or_search
  subtype:  km#conceptual_clustering_from_documents
     subtype:  km#conceptual_clustering_from_emails

1 statement is about an indirect instance of is#knowledge_based_document_search (km#conceptual_clustering_from_emails): km#graph18_on_article
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