cluster_id	sec_channel
0	0
1	0
2	2
3	1
4	0
5	2
6	2
7	2
8	3
9	2
10	0
11	0
12	2
13	2
14	1
15	3
16	3
17	3
18	1
19	0
20	3
21	1
22	0
23	3
24	3
25	0
26	3
27	1
28	1
29	2
30	1
31	1