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