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