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