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