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