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