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