data in36;
 input a b c d y;
 ab=a*b;
 ac=a*c;
 ad=a*d;
 bc=b*c;
 bd=b*d;
 cd=c*d;
 abc=ab*c;
 abd=ab*d;
 acd=ac*d;
 bcd=bc*d;
 abcd=abc*d;
cards;
-1 -1 -1 -1  90
 1 -1 -1 -1  64
-1  1 -1 -1  81
 1  1 -1 -1  63
-1 -1  1 -1  77
 1 -1  1 -1  61
-1  1  1 -1  88
 1  1  1 -1  53
-1 -1 -1  1  98
 1 -1 -1  1  62
-1  1 -1  1  87
 1  1 -1  1  75
-1 -1  1  1  99
 1 -1  1  1  69
-1  1  1  1  87
 1  1  1  1  60
;
run;