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