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