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