0 0 0
0 5 0
0 10 0
5 10 0
10 10 0
10 5 0
10 0 0
5 0 0
2.5 2.5 5
2.5 7.5 5
5 2.5 0
5 7.5 0
7.5 2.5 -3
7.5 7.5 -3