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