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