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