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