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