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