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