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