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