4
4
-10 0 0
-10 2 0
-8 2 0
-8 0 0
-6 0 2
-6 4 2
-4 4 2
-4 0 2
-2 4 4
-2 8 4
0 8 4
0 4 4
2 8 6
2 12 6
4 12 6
4 8 6