x1 x2 x3 y
1   0   0   540
1   0   0   560
0   1   0   330
0   1   0   350
0   0   1   295
0   0   1   260
2   2   0   610
0   2   2   330
2   0   2   425
1.5 6   6   710
6   1.5 6   640
6   6   1.5 460
3   3   3   800
3   3   3   850