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