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