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