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