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