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