pm#documentation
  supertype:  pm#special_file__specialfile
  instance:  http://www.webkb.org/doc/w2doc.html
  subtype:  pm#tutorial
  subtype:  pm#lecture
  subtype:  pm#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 pm#documentation (http://www.webkb.org/doc/w2doc.html): pm#graph1_on_WebKB-2
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