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