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