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