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