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