default -> -   (Coverage 1000, error 41.4%, error without exceptions 50.8%)
   unless TACAA -> +   (Coverage 650, error 41.7%, error without exceptions 44.5%)
      unless ACGCTA -> -   (Coverage 126, error 42.9%)
   or CCGGCC -> +   (Coverage 29, error 13.8%, error without exceptions 27.6%)
      unless CGACGC -> -   (Coverage 4, error 0.0%)
