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