4 4
0 0
0 10
10 10
10 0
0 0 
0 20
20 20
20 0
4 6
0 0 
0 10
10 10
10 0
0 0
0 10
10 10
10 1
9 1
9 0
12 4
1 0
1 1
0 1
0 2
1 2
1 3
2 3
2 2
3 2
3 1
2 1
2 0
0 0
0 3
3 3
3 0
0 0
