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