45
0 1 | 0 1
0 2 | 0 1
0 3 | 0 1
0 4 | 0 1
0 5 | 0 1
0 6 | 0 1
0 7 | 0 1
0 8 | 0 1
0 9 | 0 1
1 2 | 0 1
1 3 | 0 1
1 4 | 0 1
1 5 | 0 1
1 6 | 0 1
1 7 | 0 1
1 8 | 0 1
1 9 | 0 1
2 3 | 0 1
2 4 | 0 1
2 5 | 0 1
2 6 | 0 1
2 7 | 0 1
2 8 | 0 1
2 9 | 0 1
3 4 | 0 1
3 5 | 0 1
3 6 | 0 1
3 7 | 0 1
3 8 | 0 1
3 9 | 0 1
4 5 | 0 1
4 6 | 0 1
4 7 | 0 1
4 8 | 0 1
4 9 | 0 1
5 6 | 0 1
5 7 | 0 1
5 8 | 0 1
5 9 | 0 1
6 7 | 0 1
6 8 | 0 1
6 9 | 0 1
7 8 | 0 1
7 9 | 0 1
8 9 | 0 1