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