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