#teacher-student_relation__teacherstudentrelation  the academic relation between teachers and their students
  member:  #student  #instructor
  supertype:  #academic_relation  a professional relation between instructors and those they instruct
     supertype:  #professional_relation  the relation that exists when one person requests and is granted professional help from a qualified source
        supertype:  #social_relation  a relation between living organisms (especially between people)
           supertype:  #relation  an abstraction belonging to or characteristic of two entities or parts together
              supertype:  pm#thing_that_can_be_seen_as_a_relation  usable as relation type
                 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

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