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