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