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