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