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