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