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