1 1
8 1
0 0
0 1
0 2
0 3
0 4
1 0
2 0
3 0
4 0
5 0
6 0
7 0
8 0
9 0
9 1
9 2
9 3
9 4
8 4
7 4
6 4
5 4
4 4
3 4
2 4
1 4