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