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