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