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