#grade.rank__level__tier  a relative position or degree of value in a graded group: "lumber of the highest grade"
  supertype:  #rank  relative status; "his salary was determined by his rank and seniority"
  subtype:  #A_level  (England) the advanced level of a subject taken in school (usually two years after O level)
  subtype:  #O_level  (England) the basic level of a subject taken in school
  subtype:  #college_level__collegelevel  the level of education that college students are assumed to have attained

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