a b c d y
-1 -1 -1 -1  15.1
 1 -1 -1 -1  20.6
-1  1 -1 -1  68.7
 1  1 -1 -1 101.0
-1 -1  1 -1  32.9
 1 -1  1 -1  46.1
-1  1  1 -1  87.5
 1  1  1 -1 119.0
-1 -1 -1  1  11.3
 1 -1 -1  1  19.6
-1  1 -1  1  62.1
 1  1 -1  1 103.2
-1 -1  1  1  27.1
 1 -1  1  1  40.3
-1  1  1  1  87.7
 1  1  1  1 128.3