21  > RA7680
    1 C       0    2    0    1
    2 G       1    3    0    2
    3 G       2    4    0    3
    4 A       3    5    0    4
    5 A       4    6    0    5
    6 A       5    7    0    6
    7 C       6    8   15    7
    8 A       7    9   14    8
    9 C       8   10   13    9
   10 A       9   11    0   10
   11 G      10   12    0   11
   12 A      11   13    0   12
   13 G      12   14    9   13
   14 T      13   15    8   14
   15 G      14   16    7   15
   16 A      15   17    0   16
   17 C      16   18    0   17
   18 T      17   19    0   18
   19 C      18   20    0   19
   20 A      19   21    0   20
   21 A      20    0    0   21