#piano_lesson__pianolesson  a lesson in playing the piano
  supertype:  #music_lesson__musiclesson  a lesson in performing music
     supertype:  #lesson  a unit of instruction; "he took driving lessons"
        supertype:  #pedagogy__teaching__instruction  the profession of a teacher; "he prepared for teaching while still in college"; "pedagogy is recognized as an important profession"
           supertype:  #education  the profession of teaching (especially at a school or college or university)
              supertype:  #profession  an occupation requiring special education (especially in the liberal arts or sciences)
                 supertype:  #line_of_work__occupation__business__job__line  the principal activity in your life that you do to earn money; "he's not in my line of business"
                    supertype:  #activity  any specific activity or pursuit; "they avoided all recreational activity"
                       supertype:  #human_action__humanaction__act__human_activity__humanactivity  something that people do or cause to happen
                          supertype:  pm#process__proces  situation commonly considered as making a change during some period of time
                             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#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#process_or_process_description
                             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

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