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