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