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