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