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