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