length	A	U	C	G
16	1	0	5	2
17	30	4	1	8
18	80	9	37	37
19	225	25	57	74
20	312	47	79	159
21	461	63	74	167
22	407	64	72	190
23	392	56	52	165
24	292	41	44	103
25	200	45	24	50
26	105	18	10	39
27	42	9	11	13
28	6	2	2	6
29	0	0	0	0
30	0	0	0	0
31	0	0	0	0
32	0	0	0	0
33	0	0	0	0
34	0	0	0	0
35	0	0	0	0
36	0	0	0	0
37	0	0	0	0
38	0	0	0	0
39	0	0	0	0
40	0	0	0	0
41	0	0	0	0
42	0	0	0	0
43	0	0	0	0
44	0	0	0	0
45	0	0	0	0
46	0	0	0	0
47	0	0	0	0
48	0	0	0	0
49	0	0	0	0
50	0	0	0	0