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