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