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