pm#documentation
  supertype:  special_file__specialfile
  instance:  http://www.webkb.org/doc/w2doc.html
  subtype:  tutorial
  subtype:  lecture
  subtype:  user_manual
  subtype:  software_documentation__documentation  program listings or technical manuals describing the operation and use of programs

1 statement is about an indirect instance of documentation (http://www.webkb.org/doc/w2doc.html): graph1_on_WebKB-2
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