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