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