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