20 ENERGY = 0.0 Small example
1	A	0	2	0	1
2	G	1	3	9	2
3	U	2	4	8	3
4	A	3	5	17	4
5	G	4	6	16	5
6	C	5	7	15	6
7	G	6	8	14	7
8	A	7	9	3	8
9	C	8	10	2	9
10	U	9	11	0	10
11	G	10	12	19	11
12	G	11	13	18	12
13	G	12	14	0	13
14	C	13	15	7	14
15	G	14	16	6	15
16	U	15	17	5	16
17	U	16	18	4	17
18	C	17	19	12	18
19	C	18	20	11	19
20	U	19	21	0	20