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