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