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