length	A	U	C	G
16	0	0	0	0
17	2	0	0	0
18	4	0	0	3
19	6	0	2	1
20	44	6	3	3
21	75	23	2	23
22	37	8	7	23
23	42	16	4	2
24	31	2	9	5
25	25	5	4	2
26	8	4	5	15
27	14	0	4	7
28	10	3	0	9
29	1	1	0	2
30	1	4	3	1
31	3	0	0	0
32	0	0	0	0
33	0	0	0	0
34	3	0	0	0
35	1	0	0	0
36	0	0	0	0
37	0	0	0	1
38	0	0	1	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