C 20
0 0
4 0
3 2
7 2
6 0
10 0
10 4
12 3
12 7
10 6
10 10
6 10
7 12
3 12
4 10
0 10
0 6
2 7
2 3
0 4
H 3
4 4
8 4
8 5.5
H 3
4 6.5
8 8
4 8