i	y
1	0.560
1	0.842
1	0.731
1	0.782
1	0.673
1	0.718
1	0.791
1	0.726
1	0.760
1	0.798
2	0.721
2	0.731
2	0.732
2	0.741
2	0.762
2	0.713
2	0.752
2	0.738
2	0.700
2	0.728
2	0.736
2	0.746
2	0.730
2	0.739
2	0.733