x1	 x2	x3	y
-1 	 -1 	-1 	4.44
1 	 -1	-1	6.39
-1 	 1 	-1   	4.48
1   	 1	-1   	4.44
-1   	 -1 	1   	8.37
1   	 -1 	1   	8.92
-1   	 1	1	7.89
1   	 1 	1 	7.83