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