length	A	U	C	G
16	0	0	0	0
17	0	0	0	0
18	0	0	0	3
19	1	0	0	3
20	6	1	1	0
21	8	0	0	4
22	13	2	1	0
23	6	0	2	3
24	6	0	1	0
25	11	0	0	1
26	0	0	0	0
27	5	0	0	0
28	0	0	0	0
29	0	0	0	0
30	0	0	0	0
31	3	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