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