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