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