Data AandB;
input x1 x2 x3 y;
x1x2=x1*x2;
cards;
1.76 0.070 7.8 110.4
1.55 0.070 8.9 102.8
2.73 0.070 8.9 101.0
2.73 0.070 7.2 108.4
2.56 0.070 8.4 100.7
2.80 0.070 8.7 100.3
2.80 0.070 7.4 102.0
1.84 0.070 8.7  93.7
2.16 0.070 8.8  98.9
1.98 0.020 7.6  96.6
0.59 0.020 6.5  99.4
0.80 0.020 6.7  96.2
0.80 0.020 6.2  99.0
1.05 0.020 7.0  88.4
1.80 0.020 7.3  75.3
1.80 0.020 6.5  92.0
1.77 0.020 7.6  82.4
2.30 0.020 8.2  77.1
2.03 0.474 7.6  74.0
1.91 0.474 8.3  65.7
1.91 0.474 8.2  56.8
1.91 0.474 6.9  62.1
0.76 0.474 7.4  61.0
2.13 0.474 7.6  53.2
2.13 0.474 6.9  59.4
1.51 0.474 7.5  58.7
2.05 0.474 7.6  58.0
;