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