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