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