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