i	j	k	y
1	1	1	17.5
1	1	2	18.1
1	2	1	16.8
1	2	2	15.3
1	3	1	22.1
1	3	2	23.4
1	1	3	17.5
1	1	4	16.9
1	2	3	14.6
1	2	4	16.1
2	1	1	18.3
2	1	2	17.8
2	2	1	14.9
2	2	2	15.8
2	3	1	24.2
2	3	2	26.2
2	1	3	16.8
2	1	4	18.9
2	2	3	14.2
2	2	4	14.8
2	3	3	25.1