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