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