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