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