6
9.0 -1.0 -1.0 1.0 -1.0 -1.0
0.5 1.0 1.0 0.5 1.0 1.0
2.0 3.0 4.0 4.0 8.0 5.0
3.0 0.0 0.0 2.5 1.0 -1.0
3.0 2.0 7.0 2.0 -2.0 3.0
3.5 2.5 0.0 1.0 1.5 2.0