42
1: 1,2.
2: 3.
1: 3,6.
4: 6,4.
1: 4,7,8.
7: 8,7.
4: 7.
2: 4,2,7.
2: 5,8.
5: 8,5.
4: 5.
3: 4,3,5.
5: 6,7.
6: 7,6.
3: 6,8.
8: 8.
6: 8.
6: 9.
9: 10.
10: 10.
6: 10,11.
11: 12.
12: 12.
6: 12.
8: 10,11.
3: 11,10.
5: 10.
10: 11.
11: 11.
5: 11,9.
9: 9,12.
5: 12.
8: 12,9.
4: 9,12.
3: 12,9.
7: 9,10.
2: 10,12.
2: 11,9.
1: 9,11.
7: 11,12.
1: 12,10.
4: 10,11,0.
12
