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