45
2: 2.
1: 1.
3: 3.
4: 4.
5: 5.
6: 6.
7: 7.
8: 8.
9: 9.
1: 2.
9: 3.
8: 4.
7: 5.
9: 2.
8: 3.
7: 4.
6: 5.
2: 3.
1: 4.
9: 5.
8: 6.
1: 3.
9: 4.
8: 5.
7: 6.
3: 4.
2: 5.
1: 6.
9: 7.
2: 4.
1: 5.
9: 6.
8: 7.
4: 5.
3: 6.
2: 7.
1: 8.
3: 5.
2: 6.
1: 7.
9: 8.
4: 6.
3: 7.
2: 8.
1: 9,-1.
9