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