default -> -   (Coverage 1000, error 18.3%, error without exceptions 50.0%)
   unless GACG -> +   (Coverage 670, error 20.1%, error without exceptions 32.5%)
      unless TTAT -> -   (Coverage 652, error 20.4%, error without exceptions 66.9%)
         unless GGTG -> +   (Coverage 535, error 21.7%)
