21  ENERGY = 1.8  B2
    1 U       0    2    0    1
    2 C       1    3    0    2
    3 A       2    4    0    3
    4 C       3    5    0    4
    5 U       4    6    0    5
    6 G       5    7    0    6
    7 A       6    8    0    7
    8 G       7    9   17    8
    9 A       8   10    0    9
   10 A       9   11    0   10
   11 U      10   12    0   11
   12 A      11   13    0   12
   13 C      12   14    0   13
   14 U      13   15    0   14
   15 G      14   16    0   15
   16 U      15   17    0   16
   17 C      16   18    8   17
   18 C      17   19    0   18
   19 C      18   20    0   19
   20 G      19   21    0   20
   21 U      20    0    0   21