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