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