16 12 3
7 5
-2 5
-2 -4
7 -4
7 -1
5 -1
5 -2
2 -2
2 -1
1 -1
1 2
2 2
2 3
5 3
5 2
7 2
0 0
0 -1
1 -1
1 0
2 0
2 1
1 1
1 2
0 2
0 1
-1 1
-1 0
