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