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