12
18
10 0 -1
5 9 -1
0 10 -1
-5 9 -1
-10 0 -1
-5 -9 -1
0 -10 -1
10 0 1
5 9 1
0 10 1
-5 9 1
-10 0 1
-5 -9 1
0 -10 1
1 2
2 3
3 4
4 5
5 6
6 1
7 8
8 9
9 10
10 11
11 12
12 7
1 7
2 8
3 9
4 10
5 11
6 12
