code: private SEVERITY toSeverity(Integer rank) {
      if (rank <= 9) {
        return SEVERITY.ERROR;
      }
      if (rank <= 14) {
        return SEVERITY.WARN;
      }
      return SEVERITY.INFO;
    }
docs: Bugs are given a rank 1-20, and grouped into the categories scariest (rank 1-4), scary (rank
  5-9), troubling (rank 10-14), and of concern (rank 15-20).