Period	Order	Subject	Drug	Y
1	1	1	a	38
1	2	2	b	25
1	3	3	c	15
1	4	4	c	76
1	5	5	a	86
1	6	6	b	46
2	1	1	b	109
2	2	2	c	86
2	3	3	a	39
2	4	4	b	75
2	5	5	c	34
2	6	6	a	35
3	1	1	c	124
3	2	2	a	72
3	3	3	b	27
3	4	4	a	1
3	5	5	b	63
3	6	6	c	101