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