pm#array
  supertype:  pm#structured_ADT__structured_abstract_data_type
  subtype:  pm#string  a string of characters
     subtype:  rdfs#XML_literal
        subtype:  rdfs#Literal
           subtype:  pm#name_string
     subtype:  sumo#character  element of an alphabet, a set of numerals, etc.; sumo#character is a subclass of sumo#symbolic_string, because every instance of sumo#character is an alphanumeric sequence consisting of a single element

10 statements are about indirect instances of pm#array: pm#graph1_on_conference, pm#graph1_on_file, pm#graph1_on_written_material, pm#graph1_on_publication, pm#graph1_on_report, pm#graph35_on_article, pm#graph1_on_address, pm#graph1_on_housing, pm#graph1_on_meal_shop, pm#graph1_on_person
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