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