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