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