18  ENERGY = 1.7  reverse
    1 G       0    2    0    1
    2 G       1    3    0    2
    3 T       2    4   17    3
    4 G       3    5   16    4
    5 C       4    6   15    5
    6 T       5    7   14    6
    7 C       6    8   13    7
    8 T       7    9    0    8
    9 G       8   10    0    9
   10 G       9   11    0   10
   11 C      10   12    0   11
   12 C      11   13    0   12
   13 G      12   14    7   13
   14 A      13   15    6   14
   15 G      14   16    5   15
   16 C      15   17    4   16
   17 A      16   18    3   17
   18 T      17    0    0   18