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