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