{
  "\2"  => "AC ",
  "\4"  => "CG ",
  "\6"  => "AG ",
  "\t"  => "GN ",
  "\r"  => "CN ",
  "\17" => "AN ",
  "\23" => "GT ",
  "\25" => "AT ",
  "\27" => "CT ",
  "\32" => "NT ",
}
ATGNCNC ^ ATGACNN => "\0\0\0\17\0\0\r" ok
ATGNCNC ^ TTGNNNC => "\25\0\0\0\r\0\0" FAIL