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