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