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