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