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