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