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