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