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