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