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