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