7
-2.5 3.0 -1.0 -2.0
-1.0 -2.0 -2.5 3.0
7.0 5.0 -1.0 -2.0
3.0 4.5 3.0 -1.0
4.0 2.0 -2.0 2.0
0.0 0.75 3.25 3.25
1.0 -4.0 2.5 8.0