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