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