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