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