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