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