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