29
1: 1,2.
2: 3.
1: 3.
1: 4.
1: 6.
4: 6,4.
1: 7,8.
7: 8,7.
2: 2,4.
4: 7.
7: 2.
2: 5,8.
5: 8,5.
3: 3,4.
4: 5.
3: 5.
3: 6,8.
8: 8.
6: 8.
5: 6,7.
6: 7,6.
7: 9,10.
8: 10,9.
5: 9,10.
6: 10,9.
3: 9,10.
4: 10,9.
1: 9,10.
2: 10,9,0.
10

