"Id"	"C1"	"C2"	"C3"
1	a	b	c
2	a	b	c
3	a	b	c
4	a	b	c
5	a	b	c
6	a	b	c
7	a	b	c
8	a	b	c
9	a	b	c
10	a	b	c
11	a	b	c
12	a	b	l
13	a	b	m
14	a	b	n
15	a	b	o
16	a	b	p
17	a	v	q
18	a	v	c
19	a	v	c
20	a	v	c