default -> -   (Coverage 200, error 8.0%, error without exceptions 50.0%)
   unless GATGAG -> +   (Coverage 96, error 5.2%, error without exceptions 45.8%)
      unless AAATTT -> -   (Coverage 43, error 4.7)%
   or AAATTT -> +   (Coverage 101, error 10.9%, error without exceptions 50.5%)
      unless GATGA -> -   (Coverage 48, error 8.3)%
