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