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