"STORE"	"PROMO"	"Y"	"X"
1	1	12	39
2	1	23	42
3	2	11	23
4	3	17	39
5	3	15	37
6	3	18	31
7	1	12	36
8	2	19	38
9	3	21	33
10	1	13	44
11	1	7	26
12	2	5	20
13	2	8	32
14	3	17	36
15	2	19	29