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