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