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