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