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