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