OFF
7 6 0 
-1.5 2 0
0 2 0
1.5 2 0
0 1.5 0
-1 1 0
1 1 0
0 0 0
3 0 1 4
3 1 3 4
3 1 3 5
3 1 2 5
3 3 4 5
3 4 5 6