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