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