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