snp_id	strain_id	rs_value
1	1	rs31192577
1	2	rs31192577
1	3	rs31192577
2	1	rs32166183
2	2	rs32166183
2	3	rs32166183
2	4	rs32166183
3	1	rs30543887
3	2	rs30543887
3	3	rs30543887
3	4	rs30543887
4	3	rs6365082
4	4	rs6365082