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