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