12
1 0
2 0
3 0
5 0
6 0
1 -2
5 -10
-10 -10
-10 10
10 10
10 5
2 1
12
0 1
1 2
2 3
3 4
1 5
5 6
6 7
7 8
8 9
9 10
10 11
11 0