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