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