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