31
2
0 0 1
-0.5 0.5 1
-0.5 1 1
0 1.5 1
1 1.5 1
2 1 1
2 0 1
2 -1 1
1 -1.5 1
0 -2 1
-1 -2 1
-2 -1.5 1
0.5 0.5 0
1 0 0
0.5 -0.5 0
0 -1 0
-1 -1 0
-1.5 0 0
-1.5 1 0
-1 2 0
0 2.5 0
1 2.5 0
2.5 2 0
3 1 0
3 0 0
3 -1 0
2 -2 0
1 -2.5 0
0 -3 0
-1 -3 0
-2 -2.5 0