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