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