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