code: def normalize_rank(rank):
      
      normalized_ranks = {
          'BA': 'UNDERGRADUATE',
          'BACHELOR': 'UNDERGRADUATE',
          'BS': 'UNDERGRADUATE',
          'BSC': 'UNDERGRADUATE',
          'JUNIOR': 'JUNIOR',
          'MAS': 'MASTER',
          'MASTER': 'MASTER',
          'MS': 'MASTER',
          'MSC': 'MASTER',
          'PD': 'POSTDOC',
          'PHD': 'PHD',
          'POSTDOC': 'POSTDOC',
          'SENIOR': 'SENIOR',
          'STAFF': 'STAFF',
          'STUDENT': 'PHD',
          'UG': 'UNDERGRADUATE',
          'UNDERGRADUATE': 'UNDERGRADUATE',
          'VISITING SCIENTIST': 'VISITOR',
          'VISITOR': 'VISITOR',
      }
      if not rank:
          return None
      rank = rank.upper().replace('.', '')
      return normalized_ranks.get(rank, 'OTHER')
docs: Normalize a rank in order to be schema-compliant.