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