20
14 15 12 18 13 20 17 11 19 16 
18 17 13 14 15 20 19 16 12 11 
14 13 17 15 20 16 18 11 12 19 
19 12 13 15 11 18 16 14 17 20 
16 14 20 11 18 19 15 12 17 13 
16 17 14 12 11 18 20 19 15 13 
19 17 15 16 13 12 20 18 14 11 
13 20 17 16 14 15 18 11 19 12 
17 20 15 11 16 18 14 13 12 19 
15 11 12 13 16 18 19 14 17 20 
8 2 9 4 5 1 7 6 10 3 
7 8 6 2 5 10 1 3 9 4 
1 7 9 10 2 8 5 4 6 3 
6 10 3 9 7 5 2 1 8 4 
5 8 3 9 7 10 2 4 6 1 
3 5 8 6 7 2 9 1 4 10 
2 5 3 7 4 10 8 1 6 9 
4 8 7 1 6 9 2 3 10 5 
2 9 7 8 5 10 1 6 3 4 
9 6 7 8 2 1 3 4 10 5 
forbidden 1 11
forbidden 1 13
forbidden 1 14
forbidden 1 15
forbidden 1 16
forbidden 1 17
forbidden 1 19
forbidden 2 17
forbidden 2 18
forbidden 2 20
forbidden 3 16
forbidden 3 17
forbidden 5 14
forbidden 5 16
forbidden 5 18
forbidden 6 11
forbidden 6 12
forbidden 6 14
forbidden 6 15
forbidden 6 18
forbidden 6 19
forbidden 6 20
forbidden 7 12
forbidden 7 15
forbidden 7 16
forbidden 7 19
forbidden 7 20
forbidden 8 17
forbidden 9 12
forbidden 9 14
forbidden 9 16
forbidden 9 17
forbidden 9 19
forbidden 10 12
forbidden 10 16
forbidden 10 17