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