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