sid	genotype	gender	tgroup
1	c	female	3
2	b	male	3
3	c	male	3
4	b	male	1
5	c	female	3
6	b	male	1
7	a	female	2
8	a	male	3
9	d	male	1
10	a	female	2
11	d	male	2
12	d	female	2
13	d	male	2
14	d	female	1
15	d	female	4
16	d	female	2
17	d	male	3
18	c	male	1
19	a	male	1