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