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