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