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