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