#student_class__studentclas__class__clas__grade  a body of students who are taught together; "early morning classes are always sleepy"
  supertype:  #gathering__assemblage  a group of persons together in one place
  subtype:  #biology_class__biologyclas  students taking a course in biology together
  subtype:  #chemistry_class  students taking a course in chemistry together
  subtype:  #English_class  students taking a course in English together
  subtype:  #first_grade  students beginning elementary school
  subtype:  #physics_class__physicsclas  students taking a course in physics together
  subtype:  #Sunday_school_class  a class in a Sunday school

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