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