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