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