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