#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

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