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