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