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