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