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