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