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