#tetralogy  a series of four related works (plays or operas or novels)
  supertype:  #serial__series  a serialized set of programs; "a comedy series"; "the Masterworks concert series"
     supertype:  #programme__broadcast__program  a radio or television show; "did you see his program last night?"
        supertype:  #show.social_event  a public exhibition or entertainment; "they wanted to see some of the shows on Broadway"
           supertype:  #social_event  an event characteristic of persons forming groups
              supertype:  #event  something that happens at a given place and time
                 supertype:  sumo#process__proces__physicalsituation  intuitively, the class of things that happen and have temporal parts or stages; examples include extended events like a football match or a race, actions like pursuing and reading, and biological processes; sumo#process is not identical to pm#situation because an instance of pm#situation is not necessarily an instance of sumo#physical
                    supertype:  pm#situation  something that "occurs" in a real/imaginary region of time and space
                       supertype:  pm#thing__something___T__t___3D_or_4D_thing_or_anything_else  any category (type or individual) is instance of this type; any type is also a subtype of this type
                    supertype:  pm#process_or_process_description
                       supertype:  pm#processing_thing
                          supertype:  pm#thing_playing_some_role  category to classify things according to roles/viewpoints; classification under this category is application-dependant
                             supertype:  pm#thing__something___T__t___3D_or_4D_thing_or_anything_else  any category (type or individual) is instance of this type; any type is also a subtype of this type
                    supertype:  sumo#physical__physical_thing  an entity that has a location in space-time; locations are themselves understood to have a location in space-time; click here for more details on the identical category sowa#physical_thing
                       supertype:  pm#thing__something___T__t___3D_or_4D_thing_or_anything_else  any category (type or individual) is instance of this type; any type is also a subtype of this type

No statement uses or specializes #tetralogy; click here to add one.