10 20 4
-8 8
-8 -8
10 -8
10 3
7 3
7 -3
0 -3
0 4
10 4
10 8
-2 0
-2 -1
-1 -1
-1 -2
0 -2
0 -1
1 -1
1 0
2 0
2 1
1 1
1 2
0 2
0 3
-1 3
-1 2
-2 2
-2 1
-3 1
-3 0
