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