1.0 0.0
1.0 1.0
1.0 3.0
1.0 5.0
3.0 5.0
5.0 5.0
7.0 6.0
7.0 8.0 
7.0 10.0
7.0 12.0
7.0 14.0
7.0 16.0
7.0 18.0
3.0 20.5
9.0 15.7
11.0 17.0
14.0 17.0
17.0 17.0
20.0 17.0
23.0 17.0
9.0 4.5
11.0 4.5
13.0 4.5
15.0 4.5
17.0 4.5
19.0 4.5
19.0 2.5
17.0 2.5
7.0  4.0
7.0  2.0
7.0  0.0