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